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aggregator.h
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aligned_space.h
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atomic.h
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mutex.h
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null_mutex.h
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pipeline.h
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queuing_mutex.h
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queuing_rw_mutex.h
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reader_writer_lock.h
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spin_mutex.h
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tbb.h
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tbb_allocator.h
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tbb_config.h
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tbb_exception.h
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tbb_machine.h
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tbb_profiling.h
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tbb_stddef.h
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tick_count.h
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Editing: queuing_mutex.h
Close
/* Copyright (c) 2005-2017 Intel Corporation Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ #ifndef __TBB_queuing_mutex_H #define __TBB_queuing_mutex_H #include "tbb_config.h" #if !TBB_USE_EXCEPTIONS && _MSC_VER // Suppress "C++ exception handler used, but unwind semantics are not enabled" warning in STL headers #pragma warning (push) #pragma warning (disable: 4530) #endif #include <cstring> #if !TBB_USE_EXCEPTIONS && _MSC_VER #pragma warning (pop) #endif #include "atomic.h" #include "tbb_profiling.h" namespace tbb { //! Queuing mutex with local-only spinning. /** @ingroup synchronization */ class queuing_mutex : internal::mutex_copy_deprecated_and_disabled { public: //! Construct unacquired mutex. queuing_mutex() { q_tail = NULL; #if TBB_USE_THREADING_TOOLS internal_construct(); #endif } //! The scoped locking pattern /** It helps to avoid the common problem of forgetting to release lock. It also nicely provides the "node" for queuing locks. */ class scoped_lock: internal::no_copy { //! Initialize fields to mean "no lock held". void initialize() { mutex = NULL; #if TBB_USE_ASSERT internal::poison_pointer(next); #endif /* TBB_USE_ASSERT */ } public: //! Construct lock that has not acquired a mutex. /** Equivalent to zero-initialization of *this. */ scoped_lock() {initialize();} //! Acquire lock on given mutex. scoped_lock( queuing_mutex& m ) { initialize(); acquire(m); } //! Release lock (if lock is held). ~scoped_lock() { if( mutex ) release(); } //! Acquire lock on given mutex. void __TBB_EXPORTED_METHOD acquire( queuing_mutex& m ); //! Acquire lock on given mutex if free (i.e. non-blocking) bool __TBB_EXPORTED_METHOD try_acquire( queuing_mutex& m ); //! Release lock. void __TBB_EXPORTED_METHOD release(); private: //! The pointer to the mutex owned, or NULL if not holding a mutex. queuing_mutex* mutex; //! The pointer to the next competitor for a mutex scoped_lock *next; //! The local spin-wait variable /** Inverted (0 - blocked, 1 - acquired the mutex) for the sake of zero-initialization. Defining it as an entire word instead of a byte seems to help performance slightly. */ uintptr_t going; }; void __TBB_EXPORTED_METHOD internal_construct(); // Mutex traits static const bool is_rw_mutex = false; static const bool is_recursive_mutex = false; static const bool is_fair_mutex = true; private: //! The last competitor requesting the lock atomic<scoped_lock*> q_tail; }; __TBB_DEFINE_PROFILING_SET_NAME(queuing_mutex) } // namespace tbb #endif /* __TBB_queuing_mutex_H */