зеркало из https://github.com/mozilla/gecko-dev.git
88 строки
2.4 KiB
C++
88 строки
2.4 KiB
C++
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/* -*- 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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#include "mozilla/RecursiveMutex.h"
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#ifdef XP_WIN
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# include <windows.h>
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# define NativeHandle(m) (reinterpret_cast<CRITICAL_SECTION*>(&m))
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#endif
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namespace mozilla {
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RecursiveMutex::RecursiveMutex(
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const char* aName MOZ_GUARD_OBJECT_NOTIFIER_PARAM_IN_IMPL)
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: BlockingResourceBase(aName, eRecursiveMutex)
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#ifdef DEBUG
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,
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mOwningThread(nullptr),
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mEntryCount(0)
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#endif
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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#ifdef XP_WIN
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// This number was adapted from NSPR.
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static const DWORD sLockSpinCount = 100;
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# if defined(RELEASE_OR_BETA)
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// Vista and later automatically allocate and subsequently leak a debug info
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// object for each critical section that we allocate unless we tell the
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// system not to do that.
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DWORD flags = CRITICAL_SECTION_NO_DEBUG_INFO;
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# else
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DWORD flags = 0;
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# endif
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BOOL r =
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InitializeCriticalSectionEx(NativeHandle(mMutex), sLockSpinCount, flags);
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MOZ_RELEASE_ASSERT(r);
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#else
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pthread_mutexattr_t attr;
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MOZ_RELEASE_ASSERT(pthread_mutexattr_init(&attr) == 0,
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"pthread_mutexattr_init failed");
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MOZ_RELEASE_ASSERT(
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE) == 0,
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"pthread_mutexattr_settype failed");
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MOZ_RELEASE_ASSERT(pthread_mutex_init(&mMutex, &attr) == 0,
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"pthread_mutex_init failed");
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MOZ_RELEASE_ASSERT(pthread_mutexattr_destroy(&attr) == 0,
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"pthread_mutexattr_destroy failed");
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#endif
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}
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RecursiveMutex::~RecursiveMutex() {
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#ifdef XP_WIN
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DeleteCriticalSection(NativeHandle(mMutex));
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#else
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MOZ_RELEASE_ASSERT(pthread_mutex_destroy(&mMutex) == 0,
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"pthread_mutex_destroy failed");
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#endif
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}
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void RecursiveMutex::LockInternal() {
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#ifdef XP_WIN
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EnterCriticalSection(NativeHandle(mMutex));
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#else
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MOZ_RELEASE_ASSERT(pthread_mutex_lock(&mMutex) == 0,
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"pthread_mutex_lock failed");
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#endif
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}
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void RecursiveMutex::UnlockInternal() {
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#ifdef XP_WIN
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LeaveCriticalSection(NativeHandle(mMutex));
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#else
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MOZ_RELEASE_ASSERT(pthread_mutex_unlock(&mMutex) == 0,
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"pthread_mutex_unlock failed");
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#endif
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}
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} // namespace mozilla
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