зеркало из https://github.com/mozilla/gecko-dev.git
77 строки
2.1 KiB
C++
77 строки
2.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_PlatformMutex_h
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#define mozilla_PlatformMutex_h
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#include "mozilla/Atomics.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Move.h"
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#include "mozilla/RecordReplay.h"
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#if !defined(XP_WIN)
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# include <pthread.h>
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#endif
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namespace mozilla {
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namespace detail {
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class ConditionVariableImpl;
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class MutexImpl {
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public:
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struct PlatformData;
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explicit MFBT_API MutexImpl(
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recordreplay::Behavior aRecorded = recordreplay::Behavior::Preserve);
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MFBT_API ~MutexImpl();
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protected:
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MFBT_API void lock();
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MFBT_API void unlock();
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// We have a separate, forwarding API so internal uses don't have to go
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// through the PLT.
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MFBT_API bool tryLock();
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private:
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MutexImpl(const MutexImpl&) = delete;
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void operator=(const MutexImpl&) = delete;
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MutexImpl(MutexImpl&&) = delete;
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void operator=(MutexImpl&&) = delete;
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bool operator==(const MutexImpl& rhs) = delete;
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void mutexLock();
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bool mutexTryLock();
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PlatformData* platformData();
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#if !defined(XP_WIN)
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void* platformData_[sizeof(pthread_mutex_t) / sizeof(void*)];
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static_assert(sizeof(pthread_mutex_t) / sizeof(void*) != 0 &&
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sizeof(pthread_mutex_t) % sizeof(void*) == 0,
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"pthread_mutex_t must have pointer alignment");
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# ifdef XP_DARWIN
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// Moving average of the number of spins it takes to acquire the mutex if we
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// have to wait. May be accessed by multiple threads concurrently. Getting the
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// latest value is not essential hence relaxed memory ordering is sufficient.
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mozilla::Atomic<int32_t, mozilla::MemoryOrdering::Relaxed,
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recordreplay::Behavior::DontPreserve>
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averageSpins;
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# endif
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#else
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void* platformData_[6];
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#endif
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friend class mozilla::detail::ConditionVariableImpl;
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};
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} // namespace detail
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} // namespace mozilla
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#endif // mozilla_PlatformMutex_h
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