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Fix thread pool destruction where threads don't explicitly exit themselves
pull/1249/head
Fix thread pool destruction where threads don't explicitly exit themselves
pull/1249/head
Antonio SJ Musumeci
1 year ago
13 changed files with 49 additions and 5244 deletions
-
3libfuse/Makefile
-
0libfuse/include/moodycamel/blockingconcurrentqueue.h
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0libfuse/include/moodycamel/concurrentqueue.h
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0libfuse/include/moodycamel/lightweightsemaphore.h
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54libfuse/include/thread_pool.hpp
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7libfuse/lib/fuse.c
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25libfuse/lib/fuse_loop.cpp
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114libfuse/lib/syslog.c
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31libfuse/lib/syslog.h
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582src/moodycamel/blockingconcurrentqueue.h
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3747src/moodycamel/concurrentqueue.h
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427src/moodycamel/lightweightsemaphore.h
-
303src/thread_pool.hpp
@ -1,114 +0,0 @@ |
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/* |
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ISC License |
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Copyright (c) 2023, Antonio SJ Musumeci <trapexit@spawn.link> |
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Permission to use, copy, modify, and/or distribute this software for any |
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purpose with or without fee is hereby granted, provided that the above |
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copyright notice and this permission notice appear in all copies. |
|
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|
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
|
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
|
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
|
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
|
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <stdarg.h> |
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#include <syslog.h> |
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#include <stdbool.h> |
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void |
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syslog_open() |
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{ |
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const char *ident = "mergerfs"; |
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const int option = (LOG_CONS|LOG_PID); |
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const int facility = LOG_USER; |
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openlog(ident,option,facility); |
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} |
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void |
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syslog_close() |
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{ |
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closelog(); |
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} |
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static |
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void |
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syslog_vlog(const int priority_, |
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const char *format_, |
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va_list valist_) |
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{ |
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vsyslog(priority_,format_,valist_); |
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} |
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void |
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syslog_log(const int priority_, |
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const char *format_, |
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...) |
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{ |
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va_list valist; |
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va_start(valist,format_); |
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syslog_vlog(priority_,format_,valist); |
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va_end(valist); |
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} |
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void |
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syslog_debug(const char *format_, |
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...) |
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{ |
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va_list valist; |
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va_start(valist,format_); |
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syslog_vlog(LOG_DEBUG,format_,valist); |
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va_end(valist); |
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} |
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void |
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syslog_info(const char *format_, |
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...) |
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{ |
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va_list valist; |
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va_start(valist,format_); |
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syslog_vlog(LOG_INFO,format_,valist); |
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va_end(valist); |
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} |
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void |
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syslog_notice(const char *format_, |
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...) |
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{ |
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va_list valist; |
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va_start(valist,format_); |
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syslog_vlog(LOG_NOTICE,format_,valist); |
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va_end(valist); |
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} |
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void |
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syslog_warning(const char *format_, |
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...) |
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{ |
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va_list valist; |
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va_start(valist,format_); |
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syslog_vlog(LOG_WARNING,format_,valist); |
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va_end(valist); |
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} |
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void |
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syslog_error(const char *format_, |
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...) |
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{ |
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va_list valist; |
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va_start(valist,format_); |
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syslog_vlog(LOG_ERR,format_,valist); |
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va_end(valist); |
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} |
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@ -1,31 +0,0 @@ |
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/* |
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ISC License |
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Copyright (c) 2023, Antonio SJ Musumeci <trapexit@spawn.link> |
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|
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Permission to use, copy, modify, and/or distribute this software for any |
|
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purpose with or without fee is hereby granted, provided that the above |
|
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copyright notice and this permission notice appear in all copies. |
|
||||
|
|
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
|
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
|
||||
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
|
||||
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
|
||||
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
|
||||
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
|
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#pragma once |
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#include <syslog.h> |
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void syslog_open(); |
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void syslog_log(const int priority, const char *format, ...); |
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void syslog_debug(const char *format, ...); |
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void syslog_info(const char *format, ...); |
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void syslog_notice(const char *format, ...); |
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void syslog_warning(const char *format, ...); |
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void syslog_error(const char *format, ...); |
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void syslog_close(); |
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@ -1,582 +0,0 @@ |
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// Provides an efficient blocking version of moodycamel::ConcurrentQueue. |
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// ©2015-2020 Cameron Desrochers. Distributed under the terms of the simplified |
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// BSD license, available at the top of concurrentqueue.h. |
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// Also dual-licensed under the Boost Software License (see LICENSE.md) |
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// Uses Jeff Preshing's semaphore implementation (under the terms of its |
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// separate zlib license, see lightweightsemaphore.h). |
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#pragma once |
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#include "concurrentqueue.h" |
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#include "lightweightsemaphore.h" |
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#include <type_traits> |
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#include <cerrno> |
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#include <memory> |
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#include <chrono> |
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#include <ctime> |
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namespace moodycamel |
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{ |
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// This is a blocking version of the queue. It has an almost identical interface to |
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// the normal non-blocking version, with the addition of various wait_dequeue() methods |
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// and the removal of producer-specific dequeue methods. |
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template<typename T, typename Traits = ConcurrentQueueDefaultTraits> |
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class BlockingConcurrentQueue |
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{ |
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private: |
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typedef ::moodycamel::ConcurrentQueue<T, Traits> ConcurrentQueue; |
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typedef ::moodycamel::LightweightSemaphore LightweightSemaphore; |
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public: |
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typedef typename ConcurrentQueue::producer_token_t producer_token_t; |
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typedef typename ConcurrentQueue::consumer_token_t consumer_token_t; |
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typedef typename ConcurrentQueue::index_t index_t; |
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typedef typename ConcurrentQueue::size_t size_t; |
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typedef typename std::make_signed<size_t>::type ssize_t; |
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static const size_t BLOCK_SIZE = ConcurrentQueue::BLOCK_SIZE; |
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static const size_t EXPLICIT_BLOCK_EMPTY_COUNTER_THRESHOLD = ConcurrentQueue::EXPLICIT_BLOCK_EMPTY_COUNTER_THRESHOLD; |
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static const size_t EXPLICIT_INITIAL_INDEX_SIZE = ConcurrentQueue::EXPLICIT_INITIAL_INDEX_SIZE; |
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static const size_t IMPLICIT_INITIAL_INDEX_SIZE = ConcurrentQueue::IMPLICIT_INITIAL_INDEX_SIZE; |
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static const size_t INITIAL_IMPLICIT_PRODUCER_HASH_SIZE = ConcurrentQueue::INITIAL_IMPLICIT_PRODUCER_HASH_SIZE; |
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static const std::uint32_t EXPLICIT_CONSUMER_CONSUMPTION_QUOTA_BEFORE_ROTATE = ConcurrentQueue::EXPLICIT_CONSUMER_CONSUMPTION_QUOTA_BEFORE_ROTATE; |
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static const size_t MAX_SUBQUEUE_SIZE = ConcurrentQueue::MAX_SUBQUEUE_SIZE; |
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public: |
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// Creates a queue with at least `capacity` element slots; note that the |
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// actual number of elements that can be inserted without additional memory |
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// allocation depends on the number of producers and the block size (e.g. if |
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// the block size is equal to `capacity`, only a single block will be allocated |
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// up-front, which means only a single producer will be able to enqueue elements |
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// without an extra allocation -- blocks aren't shared between producers). |
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// This method is not thread safe -- it is up to the user to ensure that the |
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// queue is fully constructed before it starts being used by other threads (this |
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// includes making the memory effects of construction visible, possibly with a |
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// memory barrier). |
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explicit BlockingConcurrentQueue(size_t capacity = 6 * BLOCK_SIZE) |
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: inner(capacity), sema(create<LightweightSemaphore, ssize_t, int>(0, (int)Traits::MAX_SEMA_SPINS), &BlockingConcurrentQueue::template destroy<LightweightSemaphore>) |
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{ |
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assert(reinterpret_cast<ConcurrentQueue*>((BlockingConcurrentQueue*)1) == &((BlockingConcurrentQueue*)1)->inner && "BlockingConcurrentQueue must have ConcurrentQueue as its first member"); |
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if (!sema) { |
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MOODYCAMEL_THROW(std::bad_alloc()); |
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} |
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} |
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BlockingConcurrentQueue(size_t minCapacity, size_t maxExplicitProducers, size_t maxImplicitProducers) |
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: inner(minCapacity, maxExplicitProducers, maxImplicitProducers), sema(create<LightweightSemaphore, ssize_t, int>(0, (int)Traits::MAX_SEMA_SPINS), &BlockingConcurrentQueue::template destroy<LightweightSemaphore>) |
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{ |
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assert(reinterpret_cast<ConcurrentQueue*>((BlockingConcurrentQueue*)1) == &((BlockingConcurrentQueue*)1)->inner && "BlockingConcurrentQueue must have ConcurrentQueue as its first member"); |
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if (!sema) { |
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MOODYCAMEL_THROW(std::bad_alloc()); |
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} |
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} |
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// Disable copying and copy assignment |
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BlockingConcurrentQueue(BlockingConcurrentQueue const&) MOODYCAMEL_DELETE_FUNCTION; |
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BlockingConcurrentQueue& operator=(BlockingConcurrentQueue const&) MOODYCAMEL_DELETE_FUNCTION; |
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// Moving is supported, but note that it is *not* a thread-safe operation. |
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// Nobody can use the queue while it's being moved, and the memory effects |
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// of that move must be propagated to other threads before they can use it. |
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// Note: When a queue is moved, its tokens are still valid but can only be |
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// used with the destination queue (i.e. semantically they are moved along |
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// with the queue itself). |
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BlockingConcurrentQueue(BlockingConcurrentQueue&& other) MOODYCAMEL_NOEXCEPT |
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: inner(std::move(other.inner)), sema(std::move(other.sema)) |
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{ } |
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inline BlockingConcurrentQueue& operator=(BlockingConcurrentQueue&& other) MOODYCAMEL_NOEXCEPT |
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{ |
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return swap_internal(other); |
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} |
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// Swaps this queue's state with the other's. Not thread-safe. |
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// Swapping two queues does not invalidate their tokens, however |
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// the tokens that were created for one queue must be used with |
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// only the swapped queue (i.e. the tokens are tied to the |
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// queue's movable state, not the object itself). |
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inline void swap(BlockingConcurrentQueue& other) MOODYCAMEL_NOEXCEPT |
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{ |
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swap_internal(other); |
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} |
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private: |
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BlockingConcurrentQueue& swap_internal(BlockingConcurrentQueue& other) |
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{ |
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if (this == &other) { |
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return *this; |
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} |
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inner.swap(other.inner); |
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sema.swap(other.sema); |
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return *this; |
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} |
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public: |
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// Enqueues a single item (by copying it). |
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// Allocates memory if required. Only fails if memory allocation fails (or implicit |
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// production is disabled because Traits::INITIAL_IMPLICIT_PRODUCER_HASH_SIZE is 0, |
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// or Traits::MAX_SUBQUEUE_SIZE has been defined and would be surpassed). |
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// Thread-safe. |
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inline bool enqueue(T const& item) |
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{ |
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if ((details::likely)(inner.enqueue(item))) { |
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sema->signal(); |
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return true; |
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} |
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return false; |
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} |
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// Enqueues a single item (by moving it, if possible). |
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// Allocates memory if required. Only fails if memory allocation fails (or implicit |
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// production is disabled because Traits::INITIAL_IMPLICIT_PRODUCER_HASH_SIZE is 0, |
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// or Traits::MAX_SUBQUEUE_SIZE has been defined and would be surpassed). |
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// Thread-safe. |
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inline bool enqueue(T&& item) |
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{ |
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if ((details::likely)(inner.enqueue(std::move(item)))) { |
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sema->signal(); |
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return true; |
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} |
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return false; |
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} |
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|
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// Enqueues a single item (by copying it) using an explicit producer token. |
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// Allocates memory if required. Only fails if memory allocation fails (or |
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// Traits::MAX_SUBQUEUE_SIZE has been defined and would be surpassed). |
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// Thread-safe. |
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inline bool enqueue(producer_token_t const& token, T const& item) |
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{ |
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if ((details::likely)(inner.enqueue(token, item))) { |
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sema->signal(); |
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return true; |
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} |
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return false; |
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} |
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// Enqueues a single item (by moving it, if possible) using an explicit producer token. |
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// Allocates memory if required. Only fails if memory allocation fails (or |
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// Traits::MAX_SUBQUEUE_SIZE has been defined and would be surpassed). |
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// Thread-safe. |
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inline bool enqueue(producer_token_t const& token, T&& item) |
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{ |
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if ((details::likely)(inner.enqueue(token, std::move(item)))) { |
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sema->signal(); |
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return true; |
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} |
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return false; |
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} |
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// Enqueues several items. |
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// Allocates memory if required. Only fails if memory allocation fails (or |
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// implicit production is disabled because Traits::INITIAL_IMPLICIT_PRODUCER_HASH_SIZE |
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// is 0, or Traits::MAX_SUBQUEUE_SIZE has been defined and would be surpassed). |
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// Note: Use std::make_move_iterator if the elements should be moved instead of copied. |
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// Thread-safe. |
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template<typename It> |
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inline bool enqueue_bulk(It itemFirst, size_t count) |
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{ |
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if ((details::likely)(inner.enqueue_bulk(std::forward<It>(itemFirst), count))) { |
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sema->signal((LightweightSemaphore::ssize_t)(ssize_t)count); |
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return true; |
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} |
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return false; |
|
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} |
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|
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// Enqueues several items using an explicit producer token. |
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// Allocates memory if required. Only fails if memory allocation fails |
|
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// (or Traits::MAX_SUBQUEUE_SIZE has been defined and would be surpassed). |
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// Note: Use std::make_move_iterator if the elements should be moved |
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// instead of copied. |
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// Thread-safe. |
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template<typename It> |
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inline bool enqueue_bulk(producer_token_t const& token, It itemFirst, size_t count) |
|
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{ |
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if ((details::likely)(inner.enqueue_bulk(token, std::forward<It>(itemFirst), count))) { |
|
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sema->signal((LightweightSemaphore::ssize_t)(ssize_t)count); |
|
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return true; |
|
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} |
|
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return false; |
|
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} |
|
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|
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// Enqueues a single item (by copying it). |
|
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// Does not allocate memory. Fails if not enough room to enqueue (or implicit |
|
||||
// production is disabled because Traits::INITIAL_IMPLICIT_PRODUCER_HASH_SIZE |
|
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// is 0). |
|
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// Thread-safe. |
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inline bool try_enqueue(T const& item) |
|
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{ |
|
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if (inner.try_enqueue(item)) { |
|
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sema->signal(); |
|
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return true; |
|
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} |
|
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return false; |
|
||||
} |
|
||||
|
|
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// Enqueues a single item (by moving it, if possible). |
|
||||
// Does not allocate memory (except for one-time implicit producer). |
|
||||
// Fails if not enough room to enqueue (or implicit production is |
|
||||
// disabled because Traits::INITIAL_IMPLICIT_PRODUCER_HASH_SIZE is 0). |
|
||||
// Thread-safe. |
|
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inline bool try_enqueue(T&& item) |
|
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{ |
|
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if (inner.try_enqueue(std::move(item))) { |
|
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sema->signal(); |
|
||||
return true; |
|
||||
} |
|
||||
return false; |
|
||||
} |
|
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|
|
||||
// Enqueues a single item (by copying it) using an explicit producer token. |
|
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// Does not allocate memory. Fails if not enough room to enqueue. |
|
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// Thread-safe. |
|
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inline bool try_enqueue(producer_token_t const& token, T const& item) |
|
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{ |
|
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if (inner.try_enqueue(token, item)) { |
|
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sema->signal(); |
|
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return true; |
|
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} |
|
||||
return false; |
|
||||
} |
|
||||
|
|
||||
// Enqueues a single item (by moving it, if possible) using an explicit producer token. |
|
||||
// Does not allocate memory. Fails if not enough room to enqueue. |
|
||||
// Thread-safe. |
|
||||
inline bool try_enqueue(producer_token_t const& token, T&& item) |
|
||||
{ |
|
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if (inner.try_enqueue(token, std::move(item))) { |
|
||||
sema->signal(); |
|
||||
return true; |
|
||||
} |
|
||||
return false; |
|
||||
} |
|
||||
|
|
||||
// Enqueues several items. |
|
||||
// Does not allocate memory (except for one-time implicit producer). |
|
||||
// Fails if not enough room to enqueue (or implicit production is |
|
||||
// disabled because Traits::INITIAL_IMPLICIT_PRODUCER_HASH_SIZE is 0). |
|
||||
// Note: Use std::make_move_iterator if the elements should be moved |
|
||||
// instead of copied. |
|
||||
// Thread-safe. |
|
||||
template<typename It> |
|
||||
inline bool try_enqueue_bulk(It itemFirst, size_t count) |
|
||||
{ |
|
||||
if (inner.try_enqueue_bulk(std::forward<It>(itemFirst), count)) { |
|
||||
sema->signal((LightweightSemaphore::ssize_t)(ssize_t)count); |
|
||||
return true; |
|
||||
} |
|
||||
return false; |
|
||||
} |
|
||||
|
|
||||
// Enqueues several items using an explicit producer token. |
|
||||
// Does not allocate memory. Fails if not enough room to enqueue. |
|
||||
// Note: Use std::make_move_iterator if the elements should be moved |
|
||||
// instead of copied. |
|
||||
// Thread-safe. |
|
||||
template<typename It> |
|
||||
inline bool try_enqueue_bulk(producer_token_t const& token, It itemFirst, size_t count) |
|
||||
{ |
|
||||
if (inner.try_enqueue_bulk(token, std::forward<It>(itemFirst), count)) { |
|
||||
sema->signal((LightweightSemaphore::ssize_t)(ssize_t)count); |
|
||||
return true; |
|
||||
} |
|
||||
return false; |
|
||||
} |
|
||||
|
|
||||
|
|
||||
// Attempts to dequeue from the queue. |
|
||||
// Returns false if all producer streams appeared empty at the time they |
|
||||
// were checked (so, the queue is likely but not guaranteed to be empty). |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U> |
|
||||
inline bool try_dequeue(U& item) |
|
||||
{ |
|
||||
if (sema->tryWait()) { |
|
||||
while (!inner.try_dequeue(item)) { |
|
||||
continue; |
|
||||
} |
|
||||
return true; |
|
||||
} |
|
||||
return false; |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue from the queue using an explicit consumer token. |
|
||||
// Returns false if all producer streams appeared empty at the time they |
|
||||
// were checked (so, the queue is likely but not guaranteed to be empty). |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U> |
|
||||
inline bool try_dequeue(consumer_token_t& token, U& item) |
|
||||
{ |
|
||||
if (sema->tryWait()) { |
|
||||
while (!inner.try_dequeue(token, item)) { |
|
||||
continue; |
|
||||
} |
|
||||
return true; |
|
||||
} |
|
||||
return false; |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue. |
|
||||
// Returns the number of items actually dequeued. |
|
||||
// Returns 0 if all producer streams appeared empty at the time they |
|
||||
// were checked (so, the queue is likely but not guaranteed to be empty). |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It> |
|
||||
inline size_t try_dequeue_bulk(It itemFirst, size_t max) |
|
||||
{ |
|
||||
size_t count = 0; |
|
||||
max = (size_t)sema->tryWaitMany((LightweightSemaphore::ssize_t)(ssize_t)max); |
|
||||
while (count != max) { |
|
||||
count += inner.template try_dequeue_bulk<It&>(itemFirst, max - count); |
|
||||
} |
|
||||
return count; |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue using an explicit consumer token. |
|
||||
// Returns the number of items actually dequeued. |
|
||||
// Returns 0 if all producer streams appeared empty at the time they |
|
||||
// were checked (so, the queue is likely but not guaranteed to be empty). |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It> |
|
||||
inline size_t try_dequeue_bulk(consumer_token_t& token, It itemFirst, size_t max) |
|
||||
{ |
|
||||
size_t count = 0; |
|
||||
max = (size_t)sema->tryWaitMany((LightweightSemaphore::ssize_t)(ssize_t)max); |
|
||||
while (count != max) { |
|
||||
count += inner.template try_dequeue_bulk<It&>(token, itemFirst, max - count); |
|
||||
} |
|
||||
return count; |
|
||||
} |
|
||||
|
|
||||
|
|
||||
|
|
||||
// Blocks the current thread until there's something to dequeue, then |
|
||||
// dequeues it. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U> |
|
||||
inline void wait_dequeue(U& item) |
|
||||
{ |
|
||||
while (!sema->wait()) { |
|
||||
continue; |
|
||||
} |
|
||||
while (!inner.try_dequeue(item)) { |
|
||||
continue; |
|
||||
} |
|
||||
} |
|
||||
|
|
||||
// Blocks the current thread until either there's something to dequeue |
|
||||
// or the timeout (specified in microseconds) expires. Returns false |
|
||||
// without setting `item` if the timeout expires, otherwise assigns |
|
||||
// to `item` and returns true. |
|
||||
// Using a negative timeout indicates an indefinite timeout, |
|
||||
// and is thus functionally equivalent to calling wait_dequeue. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U> |
|
||||
inline bool wait_dequeue_timed(U& item, std::int64_t timeout_usecs) |
|
||||
{ |
|
||||
if (!sema->wait(timeout_usecs)) { |
|
||||
return false; |
|
||||
} |
|
||||
while (!inner.try_dequeue(item)) { |
|
||||
continue; |
|
||||
} |
|
||||
return true; |
|
||||
} |
|
||||
|
|
||||
// Blocks the current thread until either there's something to dequeue |
|
||||
// or the timeout expires. Returns false without setting `item` if the |
|
||||
// timeout expires, otherwise assigns to `item` and returns true. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U, typename Rep, typename Period> |
|
||||
inline bool wait_dequeue_timed(U& item, std::chrono::duration<Rep, Period> const& timeout) |
|
||||
{ |
|
||||
return wait_dequeue_timed(item, std::chrono::duration_cast<std::chrono::microseconds>(timeout).count()); |
|
||||
} |
|
||||
|
|
||||
// Blocks the current thread until there's something to dequeue, then |
|
||||
// dequeues it using an explicit consumer token. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U> |
|
||||
inline void wait_dequeue(consumer_token_t& token, U& item) |
|
||||
{ |
|
||||
while (!sema->wait()) { |
|
||||
continue; |
|
||||
} |
|
||||
while (!inner.try_dequeue(token, item)) { |
|
||||
continue; |
|
||||
} |
|
||||
} |
|
||||
|
|
||||
// Blocks the current thread until either there's something to dequeue |
|
||||
// or the timeout (specified in microseconds) expires. Returns false |
|
||||
// without setting `item` if the timeout expires, otherwise assigns |
|
||||
// to `item` and returns true. |
|
||||
// Using a negative timeout indicates an indefinite timeout, |
|
||||
// and is thus functionally equivalent to calling wait_dequeue. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U> |
|
||||
inline bool wait_dequeue_timed(consumer_token_t& token, U& item, std::int64_t timeout_usecs) |
|
||||
{ |
|
||||
if (!sema->wait(timeout_usecs)) { |
|
||||
return false; |
|
||||
} |
|
||||
while (!inner.try_dequeue(token, item)) { |
|
||||
continue; |
|
||||
} |
|
||||
return true; |
|
||||
} |
|
||||
|
|
||||
// Blocks the current thread until either there's something to dequeue |
|
||||
// or the timeout expires. Returns false without setting `item` if the |
|
||||
// timeout expires, otherwise assigns to `item` and returns true. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename U, typename Rep, typename Period> |
|
||||
inline bool wait_dequeue_timed(consumer_token_t& token, U& item, std::chrono::duration<Rep, Period> const& timeout) |
|
||||
{ |
|
||||
return wait_dequeue_timed(token, item, std::chrono::duration_cast<std::chrono::microseconds>(timeout).count()); |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue. |
|
||||
// Returns the number of items actually dequeued, which will |
|
||||
// always be at least one (this method blocks until the queue |
|
||||
// is non-empty) and at most max. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It> |
|
||||
inline size_t wait_dequeue_bulk(It itemFirst, size_t max) |
|
||||
{ |
|
||||
size_t count = 0; |
|
||||
max = (size_t)sema->waitMany((LightweightSemaphore::ssize_t)(ssize_t)max); |
|
||||
while (count != max) { |
|
||||
count += inner.template try_dequeue_bulk<It&>(itemFirst, max - count); |
|
||||
} |
|
||||
return count; |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue. |
|
||||
// Returns the number of items actually dequeued, which can |
|
||||
// be 0 if the timeout expires while waiting for elements, |
|
||||
// and at most max. |
|
||||
// Using a negative timeout indicates an indefinite timeout, |
|
||||
// and is thus functionally equivalent to calling wait_dequeue_bulk. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It> |
|
||||
inline size_t wait_dequeue_bulk_timed(It itemFirst, size_t max, std::int64_t timeout_usecs) |
|
||||
{ |
|
||||
size_t count = 0; |
|
||||
max = (size_t)sema->waitMany((LightweightSemaphore::ssize_t)(ssize_t)max, timeout_usecs); |
|
||||
while (count != max) { |
|
||||
count += inner.template try_dequeue_bulk<It&>(itemFirst, max - count); |
|
||||
} |
|
||||
return count; |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue. |
|
||||
// Returns the number of items actually dequeued, which can |
|
||||
// be 0 if the timeout expires while waiting for elements, |
|
||||
// and at most max. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It, typename Rep, typename Period> |
|
||||
inline size_t wait_dequeue_bulk_timed(It itemFirst, size_t max, std::chrono::duration<Rep, Period> const& timeout) |
|
||||
{ |
|
||||
return wait_dequeue_bulk_timed<It&>(itemFirst, max, std::chrono::duration_cast<std::chrono::microseconds>(timeout).count()); |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue using an explicit consumer token. |
|
||||
// Returns the number of items actually dequeued, which will |
|
||||
// always be at least one (this method blocks until the queue |
|
||||
// is non-empty) and at most max. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It> |
|
||||
inline size_t wait_dequeue_bulk(consumer_token_t& token, It itemFirst, size_t max) |
|
||||
{ |
|
||||
size_t count = 0; |
|
||||
max = (size_t)sema->waitMany((LightweightSemaphore::ssize_t)(ssize_t)max); |
|
||||
while (count != max) { |
|
||||
count += inner.template try_dequeue_bulk<It&>(token, itemFirst, max - count); |
|
||||
} |
|
||||
return count; |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue using an explicit consumer token. |
|
||||
// Returns the number of items actually dequeued, which can |
|
||||
// be 0 if the timeout expires while waiting for elements, |
|
||||
// and at most max. |
|
||||
// Using a negative timeout indicates an indefinite timeout, |
|
||||
// and is thus functionally equivalent to calling wait_dequeue_bulk. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It> |
|
||||
inline size_t wait_dequeue_bulk_timed(consumer_token_t& token, It itemFirst, size_t max, std::int64_t timeout_usecs) |
|
||||
{ |
|
||||
size_t count = 0; |
|
||||
max = (size_t)sema->waitMany((LightweightSemaphore::ssize_t)(ssize_t)max, timeout_usecs); |
|
||||
while (count != max) { |
|
||||
count += inner.template try_dequeue_bulk<It&>(token, itemFirst, max - count); |
|
||||
} |
|
||||
return count; |
|
||||
} |
|
||||
|
|
||||
// Attempts to dequeue several elements from the queue using an explicit consumer token. |
|
||||
// Returns the number of items actually dequeued, which can |
|
||||
// be 0 if the timeout expires while waiting for elements, |
|
||||
// and at most max. |
|
||||
// Never allocates. Thread-safe. |
|
||||
template<typename It, typename Rep, typename Period> |
|
||||
inline size_t wait_dequeue_bulk_timed(consumer_token_t& token, It itemFirst, size_t max, std::chrono::duration<Rep, Period> const& timeout) |
|
||||
{ |
|
||||
return wait_dequeue_bulk_timed<It&>(token, itemFirst, max, std::chrono::duration_cast<std::chrono::microseconds>(timeout).count()); |
|
||||
} |
|
||||
|
|
||||
|
|
||||
// Returns an estimate of the total number of elements currently in the queue. This |
|
||||
// estimate is only accurate if the queue has completely stabilized before it is called |
|
||||
// (i.e. all enqueue and dequeue operations have completed and their memory effects are |
|
||||
// visible on the calling thread, and no further operations start while this method is |
|
||||
// being called). |
|
||||
// Thread-safe. |
|
||||
inline size_t size_approx() const |
|
||||
{ |
|
||||
return (size_t)sema->availableApprox(); |
|
||||
} |
|
||||
|
|
||||
|
|
||||
// Returns true if the underlying atomic variables used by |
|
||||
// the queue are lock-free (they should be on most platforms). |
|
||||
// Thread-safe. |
|
||||
static constexpr bool is_lock_free() |
|
||||
{ |
|
||||
return ConcurrentQueue::is_lock_free(); |
|
||||
} |
|
||||
|
|
||||
|
|
||||
private: |
|
||||
template<typename U, typename A1, typename A2> |
|
||||
static inline U* create(A1&& a1, A2&& a2) |
|
||||
{ |
|
||||
void* p = (Traits::malloc)(sizeof(U)); |
|
||||
return p != nullptr ? new (p) U(std::forward<A1>(a1), std::forward<A2>(a2)) : nullptr; |
|
||||
} |
|
||||
|
|
||||
template<typename U> |
|
||||
static inline void destroy(U* p) |
|
||||
{ |
|
||||
if (p != nullptr) { |
|
||||
p->~U(); |
|
||||
} |
|
||||
(Traits::free)(p); |
|
||||
} |
|
||||
|
|
||||
private: |
|
||||
ConcurrentQueue inner; |
|
||||
std::unique_ptr<LightweightSemaphore, void (*)(LightweightSemaphore*)> sema; |
|
||||
}; |
|
||||
|
|
||||
|
|
||||
template<typename T, typename Traits> |
|
||||
inline void swap(BlockingConcurrentQueue<T, Traits>& a, BlockingConcurrentQueue<T, Traits>& b) MOODYCAMEL_NOEXCEPT |
|
||||
{ |
|
||||
a.swap(b); |
|
||||
} |
|
||||
|
|
||||
} // end namespace moodycamel |
|
||||
3747
src/moodycamel/concurrentqueue.h
File diff suppressed because it is too large
View File
File diff suppressed because it is too large
View File
@ -1,427 +0,0 @@ |
|||||
// Provides an efficient implementation of a semaphore (LightweightSemaphore). |
|
||||
// This is an extension of Jeff Preshing's sempahore implementation (licensed |
|
||||
// under the terms of its separate zlib license) that has been adapted and |
|
||||
// extended by Cameron Desrochers. |
|
||||
|
|
||||
#pragma once |
|
||||
|
|
||||
#include <cstddef> // For std::size_t |
|
||||
#include <atomic> |
|
||||
#include <type_traits> // For std::make_signed<T> |
|
||||
|
|
||||
#if defined(_WIN32) |
|
||||
// Avoid including windows.h in a header; we only need a handful of |
|
||||
// items, so we'll redeclare them here (this is relatively safe since |
|
||||
// the API generally has to remain stable between Windows versions). |
|
||||
// I know this is an ugly hack but it still beats polluting the global |
|
||||
// namespace with thousands of generic names or adding a .cpp for nothing. |
|
||||
extern "C" { |
|
||||
struct _SECURITY_ATTRIBUTES; |
|
||||
__declspec(dllimport) void* __stdcall CreateSemaphoreW(_SECURITY_ATTRIBUTES* lpSemaphoreAttributes, long lInitialCount, long lMaximumCount, const wchar_t* lpName); |
|
||||
__declspec(dllimport) int __stdcall CloseHandle(void* hObject); |
|
||||
__declspec(dllimport) unsigned long __stdcall WaitForSingleObject(void* hHandle, unsigned long dwMilliseconds); |
|
||||
__declspec(dllimport) int __stdcall ReleaseSemaphore(void* hSemaphore, long lReleaseCount, long* lpPreviousCount); |
|
||||
} |
|
||||
#elif defined(__MACH__) |
|
||||
#include <mach/mach.h> |
|
||||
#elif defined(__MVS__) |
|
||||
#include <zos-semaphore.h> |
|
||||
#elif defined(__unix__) |
|
||||
#include <semaphore.h> |
|
||||
|
|
||||
#if defined(__GLIBC_PREREQ) && defined(_GNU_SOURCE) |
|
||||
#if __GLIBC_PREREQ(2,30) |
|
||||
#define MOODYCAMEL_LIGHTWEIGHTSEMAPHORE_MONOTONIC |
|
||||
#endif |
|
||||
#endif |
|
||||
#endif |
|
||||
|
|
||||
namespace moodycamel |
|
||||
{ |
|
||||
namespace details |
|
||||
{ |
|
||||
|
|
||||
// Code in the mpmc_sema namespace below is an adaptation of Jeff Preshing's |
|
||||
// portable + lightweight semaphore implementations, originally from |
|
||||
// https://github.com/preshing/cpp11-on-multicore/blob/master/common/sema.h |
|
||||
// LICENSE: |
|
||||
// Copyright (c) 2015 Jeff Preshing |
|
||||
// |
|
||||
// This software is provided 'as-is', without any express or implied |
|
||||
// warranty. In no event will the authors be held liable for any damages |
|
||||
// arising from the use of this software. |
|
||||
// |
|
||||
// Permission is granted to anyone to use this software for any purpose, |
|
||||
// including commercial applications, and to alter it and redistribute it |
|
||||
// freely, subject to the following restrictions: |
|
||||
// |
|
||||
// 1. The origin of this software must not be misrepresented; you must not |
|
||||
// claim that you wrote the original software. If you use this software |
|
||||
// in a product, an acknowledgement in the product documentation would be |
|
||||
// appreciated but is not required. |
|
||||
// 2. Altered source versions must be plainly marked as such, and must not be |
|
||||
// misrepresented as being the original software. |
|
||||
// 3. This notice may not be removed or altered from any source distribution. |
|
||||
#if defined(_WIN32) |
|
||||
class Semaphore |
|
||||
{ |
|
||||
private: |
|
||||
void* m_hSema; |
|
||||
|
|
||||
Semaphore(const Semaphore& other) MOODYCAMEL_DELETE_FUNCTION; |
|
||||
Semaphore& operator=(const Semaphore& other) MOODYCAMEL_DELETE_FUNCTION; |
|
||||
|
|
||||
public: |
|
||||
Semaphore(int initialCount = 0) |
|
||||
{ |
|
||||
assert(initialCount >= 0); |
|
||||
const long maxLong = 0x7fffffff; |
|
||||
m_hSema = CreateSemaphoreW(nullptr, initialCount, maxLong, nullptr); |
|
||||
assert(m_hSema); |
|
||||
} |
|
||||
|
|
||||
~Semaphore() |
|
||||
{ |
|
||||
CloseHandle(m_hSema); |
|
||||
} |
|
||||
|
|
||||
bool wait() |
|
||||
{ |
|
||||
const unsigned long infinite = 0xffffffff; |
|
||||
return WaitForSingleObject(m_hSema, infinite) == 0; |
|
||||
} |
|
||||
|
|
||||
bool try_wait() |
|
||||
{ |
|
||||
return WaitForSingleObject(m_hSema, 0) == 0; |
|
||||
} |
|
||||
|
|
||||
bool timed_wait(std::uint64_t usecs) |
|
||||
{ |
|
||||
return WaitForSingleObject(m_hSema, (unsigned long)(usecs / 1000)) == 0; |
|
||||
} |
|
||||
|
|
||||
void signal(int count = 1) |
|
||||
{ |
|
||||
while (!ReleaseSemaphore(m_hSema, count, nullptr)); |
|
||||
} |
|
||||
}; |
|
||||
#elif defined(__MACH__) |
|
||||
//--------------------------------------------------------- |
|
||||
// Semaphore (Apple iOS and OSX) |
|
||||
// Can't use POSIX semaphores due to http://lists.apple.com/archives/darwin-kernel/2009/Apr/msg00010.html |
|
||||
//--------------------------------------------------------- |
|
||||
class Semaphore |
|
||||
{ |
|
||||
private: |
|
||||
semaphore_t m_sema; |
|
||||
|
|
||||
Semaphore(const Semaphore& other) MOODYCAMEL_DELETE_FUNCTION; |
|
||||
Semaphore& operator=(const Semaphore& other) MOODYCAMEL_DELETE_FUNCTION; |
|
||||
|
|
||||
public: |
|
||||
Semaphore(int initialCount = 0) |
|
||||
{ |
|
||||
assert(initialCount >= 0); |
|
||||
kern_return_t rc = semaphore_create(mach_task_self(), &m_sema, SYNC_POLICY_FIFO, initialCount); |
|
||||
assert(rc == KERN_SUCCESS); |
|
||||
(void)rc; |
|
||||
} |
|
||||
|
|
||||
~Semaphore() |
|
||||
{ |
|
||||
semaphore_destroy(mach_task_self(), m_sema); |
|
||||
} |
|
||||
|
|
||||
bool wait() |
|
||||
{ |
|
||||
return semaphore_wait(m_sema) == KERN_SUCCESS; |
|
||||
} |
|
||||
|
|
||||
bool try_wait() |
|
||||
{ |
|
||||
return timed_wait(0); |
|
||||
} |
|
||||
|
|
||||
bool timed_wait(std::uint64_t timeout_usecs) |
|
||||
{ |
|
||||
mach_timespec_t ts; |
|
||||
ts.tv_sec = static_cast<unsigned int>(timeout_usecs / 1000000); |
|
||||
ts.tv_nsec = static_cast<int>((timeout_usecs % 1000000) * 1000); |
|
||||
|
|
||||
// added in OSX 10.10: https://developer.apple.com/library/prerelease/mac/documentation/General/Reference/APIDiffsMacOSX10_10SeedDiff/modules/Darwin.html |
|
||||
kern_return_t rc = semaphore_timedwait(m_sema, ts); |
|
||||
return rc == KERN_SUCCESS; |
|
||||
} |
|
||||
|
|
||||
void signal() |
|
||||
{ |
|
||||
while (semaphore_signal(m_sema) != KERN_SUCCESS); |
|
||||
} |
|
||||
|
|
||||
void signal(int count) |
|
||||
{ |
|
||||
while (count-- > 0) |
|
||||
{ |
|
||||
while (semaphore_signal(m_sema) != KERN_SUCCESS); |
|
||||
} |
|
||||
} |
|
||||
}; |
|
||||
#elif defined(__unix__) || defined(__MVS__) |
|
||||
//--------------------------------------------------------- |
|
||||
// Semaphore (POSIX, Linux, zOS) |
|
||||
//--------------------------------------------------------- |
|
||||
class Semaphore |
|
||||
{ |
|
||||
private: |
|
||||
sem_t m_sema; |
|
||||
|
|
||||
Semaphore(const Semaphore& other) MOODYCAMEL_DELETE_FUNCTION; |
|
||||
Semaphore& operator=(const Semaphore& other) MOODYCAMEL_DELETE_FUNCTION; |
|
||||
|
|
||||
public: |
|
||||
Semaphore(int initialCount = 0) |
|
||||
{ |
|
||||
assert(initialCount >= 0); |
|
||||
int rc = sem_init(&m_sema, 0, static_cast<unsigned int>(initialCount)); |
|
||||
assert(rc == 0); |
|
||||
(void)rc; |
|
||||
} |
|
||||
|
|
||||
~Semaphore() |
|
||||
{ |
|
||||
sem_destroy(&m_sema); |
|
||||
} |
|
||||
|
|
||||
bool wait() |
|
||||
{ |
|
||||
// http://stackoverflow.com/questions/2013181/gdb-causes-sem-wait-to-fail-with-eintr-error |
|
||||
int rc; |
|
||||
do { |
|
||||
rc = sem_wait(&m_sema); |
|
||||
} while (rc == -1 && errno == EINTR); |
|
||||
return rc == 0; |
|
||||
} |
|
||||
|
|
||||
bool try_wait() |
|
||||
{ |
|
||||
int rc; |
|
||||
do { |
|
||||
rc = sem_trywait(&m_sema); |
|
||||
} while (rc == -1 && errno == EINTR); |
|
||||
return rc == 0; |
|
||||
} |
|
||||
|
|
||||
bool timed_wait(std::uint64_t usecs) |
|
||||
{ |
|
||||
struct timespec ts; |
|
||||
const int usecs_in_1_sec = 1000000; |
|
||||
const int nsecs_in_1_sec = 1000000000; |
|
||||
#ifdef MOODYCAMEL_LIGHTWEIGHTSEMAPHORE_MONOTONIC |
|
||||
clock_gettime(CLOCK_MONOTONIC, &ts); |
|
||||
#else |
|
||||
clock_gettime(CLOCK_REALTIME, &ts); |
|
||||
#endif |
|
||||
ts.tv_sec += (time_t)(usecs / usecs_in_1_sec); |
|
||||
ts.tv_nsec += (long)(usecs % usecs_in_1_sec) * 1000; |
|
||||
// sem_timedwait bombs if you have more than 1e9 in tv_nsec |
|
||||
// so we have to clean things up before passing it in |
|
||||
if (ts.tv_nsec >= nsecs_in_1_sec) { |
|
||||
ts.tv_nsec -= nsecs_in_1_sec; |
|
||||
++ts.tv_sec; |
|
||||
} |
|
||||
|
|
||||
int rc; |
|
||||
do { |
|
||||
#ifdef MOODYCAMEL_LIGHTWEIGHTSEMAPHORE_MONOTONIC |
|
||||
rc = sem_clockwait(&m_sema, CLOCK_MONOTONIC, &ts); |
|
||||
#else |
|
||||
rc = sem_timedwait(&m_sema, &ts); |
|
||||
#endif |
|
||||
} while (rc == -1 && errno == EINTR); |
|
||||
return rc == 0; |
|
||||
} |
|
||||
|
|
||||
void signal() |
|
||||
{ |
|
||||
while (sem_post(&m_sema) == -1); |
|
||||
} |
|
||||
|
|
||||
void signal(int count) |
|
||||
{ |
|
||||
while (count-- > 0) |
|
||||
{ |
|
||||
while (sem_post(&m_sema) == -1); |
|
||||
} |
|
||||
} |
|
||||
}; |
|
||||
#else |
|
||||
#error Unsupported platform! (No semaphore wrapper available) |
|
||||
#endif |
|
||||
|
|
||||
} // end namespace details |
|
||||
|
|
||||
|
|
||||
//--------------------------------------------------------- |
|
||||
// LightweightSemaphore |
|
||||
//--------------------------------------------------------- |
|
||||
class LightweightSemaphore |
|
||||
{ |
|
||||
public: |
|
||||
typedef std::make_signed<std::size_t>::type ssize_t; |
|
||||
|
|
||||
private: |
|
||||
std::atomic<ssize_t> m_count; |
|
||||
details::Semaphore m_sema; |
|
||||
int m_maxSpins; |
|
||||
|
|
||||
bool waitWithPartialSpinning(std::int64_t timeout_usecs = -1) |
|
||||
{ |
|
||||
ssize_t oldCount; |
|
||||
int spin = m_maxSpins; |
|
||||
while (--spin >= 0) |
|
||||
{ |
|
||||
oldCount = m_count.load(std::memory_order_relaxed); |
|
||||
if ((oldCount > 0) && m_count.compare_exchange_strong(oldCount, oldCount - 1, std::memory_order_acquire, std::memory_order_relaxed)) |
|
||||
return true; |
|
||||
std::atomic_signal_fence(std::memory_order_acquire); // Prevent the compiler from collapsing the loop. |
|
||||
} |
|
||||
oldCount = m_count.fetch_sub(1, std::memory_order_acquire); |
|
||||
if (oldCount > 0) |
|
||||
return true; |
|
||||
if (timeout_usecs < 0) |
|
||||
{ |
|
||||
if (m_sema.wait()) |
|
||||
return true; |
|
||||
} |
|
||||
if (timeout_usecs > 0 && m_sema.timed_wait((std::uint64_t)timeout_usecs)) |
|
||||
return true; |
|
||||
// At this point, we've timed out waiting for the semaphore, but the |
|
||||
// count is still decremented indicating we may still be waiting on |
|
||||
// it. So we have to re-adjust the count, but only if the semaphore |
|
||||
// wasn't signaled enough times for us too since then. If it was, we |
|
||||
// need to release the semaphore too. |
|
||||
while (true) |
|
||||
{ |
|
||||
oldCount = m_count.load(std::memory_order_acquire); |
|
||||
if (oldCount >= 0 && m_sema.try_wait()) |
|
||||
return true; |
|
||||
if (oldCount < 0 && m_count.compare_exchange_strong(oldCount, oldCount + 1, std::memory_order_relaxed, std::memory_order_relaxed)) |
|
||||
return false; |
|
||||
} |
|
||||
} |
|
||||
|
|
||||
ssize_t waitManyWithPartialSpinning(ssize_t max, std::int64_t timeout_usecs = -1) |
|
||||
{ |
|
||||
assert(max > 0); |
|
||||
ssize_t oldCount; |
|
||||
int spin = m_maxSpins; |
|
||||
while (--spin >= 0) |
|
||||
{ |
|
||||
oldCount = m_count.load(std::memory_order_relaxed); |
|
||||
if (oldCount > 0) |
|
||||
{ |
|
||||
ssize_t newCount = oldCount > max ? oldCount - max : 0; |
|
||||
if (m_count.compare_exchange_strong(oldCount, newCount, std::memory_order_acquire, std::memory_order_relaxed)) |
|
||||
return oldCount - newCount; |
|
||||
} |
|
||||
std::atomic_signal_fence(std::memory_order_acquire); |
|
||||
} |
|
||||
oldCount = m_count.fetch_sub(1, std::memory_order_acquire); |
|
||||
if (oldCount <= 0) |
|
||||
{ |
|
||||
if ((timeout_usecs == 0) || (timeout_usecs < 0 && !m_sema.wait()) || (timeout_usecs > 0 && !m_sema.timed_wait((std::uint64_t)timeout_usecs))) |
|
||||
{ |
|
||||
while (true) |
|
||||
{ |
|
||||
oldCount = m_count.load(std::memory_order_acquire); |
|
||||
if (oldCount >= 0 && m_sema.try_wait()) |
|
||||
break; |
|
||||
if (oldCount < 0 && m_count.compare_exchange_strong(oldCount, oldCount + 1, std::memory_order_relaxed, std::memory_order_relaxed)) |
|
||||
return 0; |
|
||||
} |
|
||||
} |
|
||||
} |
|
||||
if (max > 1) |
|
||||
return 1 + tryWaitMany(max - 1); |
|
||||
return 1; |
|
||||
} |
|
||||
|
|
||||
public: |
|
||||
LightweightSemaphore(ssize_t initialCount = 0, int maxSpins = 10000) : m_count(initialCount), m_maxSpins(maxSpins) |
|
||||
{ |
|
||||
assert(initialCount >= 0); |
|
||||
assert(maxSpins >= 0); |
|
||||
} |
|
||||
|
|
||||
bool tryWait() |
|
||||
{ |
|
||||
ssize_t oldCount = m_count.load(std::memory_order_relaxed); |
|
||||
while (oldCount > 0) |
|
||||
{ |
|
||||
if (m_count.compare_exchange_weak(oldCount, oldCount - 1, std::memory_order_acquire, std::memory_order_relaxed)) |
|
||||
return true; |
|
||||
} |
|
||||
return false; |
|
||||
} |
|
||||
|
|
||||
bool wait() |
|
||||
{ |
|
||||
return tryWait() || waitWithPartialSpinning(); |
|
||||
} |
|
||||
|
|
||||
bool wait(std::int64_t timeout_usecs) |
|
||||
{ |
|
||||
return tryWait() || waitWithPartialSpinning(timeout_usecs); |
|
||||
} |
|
||||
|
|
||||
// Acquires between 0 and (greedily) max, inclusive |
|
||||
ssize_t tryWaitMany(ssize_t max) |
|
||||
{ |
|
||||
assert(max >= 0); |
|
||||
ssize_t oldCount = m_count.load(std::memory_order_relaxed); |
|
||||
while (oldCount > 0) |
|
||||
{ |
|
||||
ssize_t newCount = oldCount > max ? oldCount - max : 0; |
|
||||
if (m_count.compare_exchange_weak(oldCount, newCount, std::memory_order_acquire, std::memory_order_relaxed)) |
|
||||
return oldCount - newCount; |
|
||||
} |
|
||||
return 0; |
|
||||
} |
|
||||
|
|
||||
// Acquires at least one, and (greedily) at most max |
|
||||
ssize_t waitMany(ssize_t max, std::int64_t timeout_usecs) |
|
||||
{ |
|
||||
assert(max >= 0); |
|
||||
ssize_t result = tryWaitMany(max); |
|
||||
if (result == 0 && max > 0) |
|
||||
result = waitManyWithPartialSpinning(max, timeout_usecs); |
|
||||
return result; |
|
||||
} |
|
||||
|
|
||||
ssize_t waitMany(ssize_t max) |
|
||||
{ |
|
||||
ssize_t result = waitMany(max, -1); |
|
||||
assert(result > 0); |
|
||||
return result; |
|
||||
} |
|
||||
|
|
||||
void signal(ssize_t count = 1) |
|
||||
{ |
|
||||
assert(count >= 0); |
|
||||
ssize_t oldCount = m_count.fetch_add(count, std::memory_order_release); |
|
||||
ssize_t toRelease = -oldCount < count ? -oldCount : count; |
|
||||
if (toRelease > 0) |
|
||||
{ |
|
||||
m_sema.signal((int)toRelease); |
|
||||
} |
|
||||
} |
|
||||
|
|
||||
std::size_t availableApprox() const |
|
||||
{ |
|
||||
ssize_t count = m_count.load(std::memory_order_relaxed); |
|
||||
return count > 0 ? static_cast<std::size_t>(count) : 0; |
|
||||
} |
|
||||
}; |
|
||||
|
|
||||
} // end namespace moodycamel |
|
||||
@ -1,303 +0,0 @@ |
|||||
#pragma once
|
|
||||
|
|
||||
#include "moodycamel/blockingconcurrentqueue.h"
|
|
||||
#include "syslog.hpp"
|
|
||||
|
|
||||
#include <atomic>
|
|
||||
#include <csignal>
|
|
||||
#include <cstring>
|
|
||||
#include <future>
|
|
||||
#include <memory>
|
|
||||
#include <mutex>
|
|
||||
#include <stdexcept>
|
|
||||
#include <string>
|
|
||||
#include <thread>
|
|
||||
#include <vector>
|
|
||||
|
|
||||
|
|
||||
struct ThreadPoolTraits : public moodycamel::ConcurrentQueueDefaultTraits |
|
||||
{ |
|
||||
static const int MAX_SEMA_SPINS = 1; |
|
||||
}; |
|
||||
|
|
||||
|
|
||||
class ThreadPool |
|
||||
{ |
|
||||
private: |
|
||||
using Func = std::function<void(void)>; |
|
||||
using Queue = moodycamel::BlockingConcurrentQueue<Func,ThreadPoolTraits>; |
|
||||
|
|
||||
public: |
|
||||
explicit |
|
||||
ThreadPool(std::size_t const thread_count_ = std::thread::hardware_concurrency(), |
|
||||
std::size_t const queue_depth_ = 1, |
|
||||
std::string const name_ = {}) |
|
||||
: _queue(queue_depth_,thread_count_,thread_count_), |
|
||||
_name(get_thread_name(name_)) |
|
||||
{ |
|
||||
syslog_debug("threadpool: spawning %zu threads of queue depth %zu named '%s'", |
|
||||
thread_count_, |
|
||||
queue_depth_, |
|
||||
_name.c_str()); |
|
||||
|
|
||||
sigset_t oldset; |
|
||||
sigset_t newset; |
|
||||
|
|
||||
sigfillset(&newset); |
|
||||
pthread_sigmask(SIG_BLOCK,&newset,&oldset); |
|
||||
|
|
||||
_threads.reserve(thread_count_); |
|
||||
for(std::size_t i = 0; i < thread_count_; ++i) |
|
||||
{ |
|
||||
int rv; |
|
||||
pthread_t t; |
|
||||
|
|
||||
rv = pthread_create(&t,NULL,ThreadPool::start_routine,this); |
|
||||
if(rv != 0) |
|
||||
{ |
|
||||
syslog_warning("threadpool: error spawning thread - %d (%s)", |
|
||||
rv, |
|
||||
strerror(rv)); |
|
||||
continue; |
|
||||
} |
|
||||
|
|
||||
if(!_name.empty()) |
|
||||
pthread_setname_np(t,_name.c_str()); |
|
||||
|
|
||||
_threads.push_back(t); |
|
||||
} |
|
||||
|
|
||||
pthread_sigmask(SIG_SETMASK,&oldset,NULL); |
|
||||
|
|
||||
if(_threads.empty()) |
|
||||
throw std::runtime_error("threadpool: failed to spawn any threads"); |
|
||||
} |
|
||||
|
|
||||
~ThreadPool() |
|
||||
{ |
|
||||
syslog_debug("threadpool: destroying %zu threads named '%s'", |
|
||||
_threads.size(), |
|
||||
_name.c_str()); |
|
||||
|
|
||||
for(auto t : _threads) |
|
||||
pthread_cancel(t); |
|
||||
|
|
||||
Func f; |
|
||||
while(_queue.try_dequeue(f)) |
|
||||
continue; |
|
||||
|
|
||||
for(auto t : _threads) |
|
||||
pthread_join(t,NULL); |
|
||||
} |
|
||||
|
|
||||
private: |
|
||||
static |
|
||||
std::string |
|
||||
get_thread_name(std::string const name_) |
|
||||
{ |
|
||||
if(!name_.empty()) |
|
||||
return name_; |
|
||||
|
|
||||
char name[16]; |
|
||||
pthread_getname_np(pthread_self(),name,sizeof(name)); |
|
||||
|
|
||||
return name; |
|
||||
} |
|
||||
|
|
||||
static |
|
||||
void* |
|
||||
start_routine(void *arg_) |
|
||||
{ |
|
||||
ThreadPool *btp = static_cast<ThreadPool*>(arg_); |
|
||||
ThreadPool::Func func; |
|
||||
ThreadPool::Queue &q = btp->_queue; |
|
||||
moodycamel::ConsumerToken ctok(btp->_queue); |
|
||||
|
|
||||
while(true) |
|
||||
{ |
|
||||
q.wait_dequeue(ctok,func); |
|
||||
|
|
||||
func(); |
|
||||
} |
|
||||
|
|
||||
return NULL; |
|
||||
} |
|
||||
|
|
||||
public: |
|
||||
int |
|
||||
add_thread(std::string const name_ = {}) |
|
||||
{ |
|
||||
int rv; |
|
||||
pthread_t t; |
|
||||
sigset_t oldset; |
|
||||
sigset_t newset; |
|
||||
std::string name; |
|
||||
|
|
||||
name = (name_.empty() ? _name : name_); |
|
||||
|
|
||||
sigfillset(&newset); |
|
||||
pthread_sigmask(SIG_BLOCK,&newset,&oldset); |
|
||||
rv = pthread_create(&t,NULL,ThreadPool::start_routine,this); |
|
||||
pthread_sigmask(SIG_SETMASK,&oldset,NULL); |
|
||||
|
|
||||
if(rv != 0) |
|
||||
{ |
|
||||
syslog_warning("threadpool: error spawning thread - %d (%s)", |
|
||||
rv, |
|
||||
strerror(rv)); |
|
||||
return -rv; |
|
||||
} |
|
||||
|
|
||||
if(!name.empty()) |
|
||||
pthread_setname_np(t,name.c_str()); |
|
||||
|
|
||||
{ |
|
||||
std::lock_guard<std::mutex> lg(_threads_mutex); |
|
||||
_threads.push_back(t); |
|
||||
} |
|
||||
|
|
||||
syslog_debug("threadpool: 1 thread added to pool '%s' named '%s'", |
|
||||
_name.c_str(), |
|
||||
name.c_str()); |
|
||||
|
|
||||
return 0; |
|
||||
} |
|
||||
|
|
||||
int |
|
||||
remove_thread(void) |
|
||||
{ |
|
||||
{ |
|
||||
std::lock_guard<std::mutex> lg(_threads_mutex); |
|
||||
if(_threads.size() <= 1) |
|
||||
return -EINVAL; |
|
||||
} |
|
||||
|
|
||||
std::promise<pthread_t> promise; |
|
||||
auto func = [&]() |
|
||||
{ |
|
||||
pthread_t t; |
|
||||
|
|
||||
t = pthread_self(); |
|
||||
promise.set_value(t); |
|
||||
|
|
||||
{ |
|
||||
std::lock_guard<std::mutex> lg(_threads_mutex); |
|
||||
|
|
||||
for(auto i = _threads.begin(); i != _threads.end(); ++i) |
|
||||
{ |
|
||||
if(*i != t) |
|
||||
continue; |
|
||||
|
|
||||
_threads.erase(i); |
|
||||
break; |
|
||||
} |
|
||||
} |
|
||||
|
|
||||
char name[16]; |
|
||||
pthread_getname_np(t,name,sizeof(name)); |
|
||||
syslog_debug("threadpool: 1 thread removed from pool '%s' named '%s'", |
|
||||
_name.c_str(), |
|
||||
name); |
|
||||
|
|
||||
pthread_exit(NULL); |
|
||||
}; |
|
||||
|
|
||||
enqueue_work(func); |
|
||||
pthread_join(promise.get_future().get(),NULL); |
|
||||
|
|
||||
return 0; |
|
||||
} |
|
||||
|
|
||||
int |
|
||||
set_threads(std::size_t const count_) |
|
||||
{ |
|
||||
int diff; |
|
||||
{ |
|
||||
std::lock_guard<std::mutex> lg(_threads_mutex); |
|
||||
|
|
||||
diff = ((int)count_ - (int)_threads.size()); |
|
||||
} |
|
||||
|
|
||||
for(auto i = diff; i > 0; --i) |
|
||||
add_thread(); |
|
||||
for(auto i = diff; i < 0; ++i) |
|
||||
remove_thread(); |
|
||||
|
|
||||
return diff; |
|
||||
} |
|
||||
|
|
||||
public: |
|
||||
template<typename FuncType> |
|
||||
void |
|
||||
enqueue_work(moodycamel::ProducerToken &ptok_, |
|
||||
FuncType &&f_) |
|
||||
{ |
|
||||
timespec ts = {0,10}; |
|
||||
while(true) |
|
||||
{ |
|
||||
if(_queue.try_enqueue(ptok_,f_)) |
|
||||
return; |
|
||||
::nanosleep(&ts,NULL); |
|
||||
ts.tv_nsec += 10; |
|
||||
} |
|
||||
} |
|
||||
|
|
||||
template<typename FuncType> |
|
||||
void |
|
||||
enqueue_work(FuncType &&f_) |
|
||||
{ |
|
||||
timespec ts = {0,10}; |
|
||||
while(true) |
|
||||
{ |
|
||||
if(_queue.try_enqueue(f_)) |
|
||||
return; |
|
||||
::nanosleep(&ts,NULL); |
|
||||
ts.tv_nsec += 10; |
|
||||
} |
|
||||
} |
|
||||
|
|
||||
template<typename FuncType> |
|
||||
[[nodiscard]] |
|
||||
std::future<typename std::result_of<FuncType()>::type> |
|
||||
enqueue_task(FuncType&& f_) |
|
||||
{ |
|
||||
using TaskReturnType = typename std::result_of<FuncType()>::type; |
|
||||
using Promise = std::promise<TaskReturnType>; |
|
||||
|
|
||||
auto promise = std::make_shared<Promise>(); |
|
||||
auto future = promise->get_future(); |
|
||||
auto work = [=]() |
|
||||
{ |
|
||||
auto rv = f_(); |
|
||||
promise->set_value(rv); |
|
||||
}; |
|
||||
|
|
||||
timespec ts = {0,10}; |
|
||||
while(true) |
|
||||
{ |
|
||||
if(_queue.try_enqueue(work)) |
|
||||
break; |
|
||||
::nanosleep(&ts,NULL); |
|
||||
ts.tv_nsec += 10; |
|
||||
} |
|
||||
|
|
||||
return future; |
|
||||
} |
|
||||
|
|
||||
public: |
|
||||
std::vector<pthread_t> |
|
||||
threads() const |
|
||||
{ |
|
||||
std::lock_guard<std::mutex> lg(_threads_mutex); |
|
||||
|
|
||||
return _threads; |
|
||||
} |
|
||||
|
|
||||
private: |
|
||||
Queue _queue; |
|
||||
|
|
||||
private: |
|
||||
std::string const _name; |
|
||||
std::vector<pthread_t> _threads; |
|
||||
mutable std::mutex _threads_mutex; |
|
||||
}; |
|
||||
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