Laurent Morichetti
5079410c94
There is a small window where a thread can go to sleep in Monitor::wait after releasing the lock but before another thread notifies the monitor and updates the on-deck thread. A simple approach to fix this problem is to wake-up the Monitor::wait every 10 milliseconds and check if it is on-deck. Change-Id: I4b9abda89d1fc653cdae2b4c84cdda01efde1cf2
80 рядки
2.1 KiB
C++
80 рядки
2.1 KiB
C++
/* Copyright (c) 2008-present Advanced Micro Devices, Inc.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE. */
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#ifndef SEMAPHORE_HPP_
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#define SEMAPHORE_HPP_
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#include "top.hpp"
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#include "utils/util.hpp"
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#include <atomic>
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#if defined(__linux__)
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#include <semaphore.h>
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#endif /*linux*/
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namespace amd {
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/*! \addtogroup Threads
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* @{
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*
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* \addtogroup Synchronization
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* @{
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*/
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class Thread;
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//! \brief Counting semaphore
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class alignas(64) Semaphore : public HeapObject {
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private:
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std::atomic_int state_; //!< This semaphore's value.
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#ifdef _WIN32
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void* handle_; //!< The semaphore object's handle.
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#else // !_WIN32
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sem_t sem_; //!< The semaphore object's identifier.
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#endif /*!_WIN32*/
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public:
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Semaphore();
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~Semaphore();
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//! \brief Decrement this semaphore
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void wait();
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void timedWait(int millis);
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//! \brief Increment this semaphore
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void post();
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//! \brief Reset this semaphore.
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void reset() { state_.store(0, std::memory_order_release); }
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};
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static_assert(sizeof(Semaphore) == 64 ,
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"unexpected total size of Semaphore");
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/*! @}
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* @}
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*/
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} // namespace amd
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#endif /*SEMAPHORE_HPP_*/
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