зеркало из https://github.com/mozilla/gecko-dev.git
118 строки
3.0 KiB
C++
118 строки
3.0 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 xpcom_build_IOInterposerPrivate_h
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#define xpcom_build_IOInterposerPrivate_h
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/* This header file contains declarations for helper classes that are
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to be used exclusively by IOInterposer and its observers. This header
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file is not to be used by anything else and MUST NOT be exported! */
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#include <prcvar.h>
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#include <prlock.h>
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#include "mozilla/ThreadSafety.h"
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namespace mozilla {
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namespace IOInterposer {
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/**
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* The following classes are simple wrappers for PRLock and PRCondVar.
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* IOInterposer and friends use these instead of Mozilla::Mutex et al because
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* of the fact that IOInterposer is permitted to run until the process
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* terminates; we can't use anything that plugs into leak checkers or deadlock
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* detectors because IOInterposer will outlive those and generate false
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* positives.
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*/
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class MOZ_CAPABILITY("monitor") Monitor {
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public:
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Monitor() : mLock(PR_NewLock()), mCondVar(PR_NewCondVar(mLock)) {}
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~Monitor() {
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PR_DestroyCondVar(mCondVar);
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mCondVar = nullptr;
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PR_DestroyLock(mLock);
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mLock = nullptr;
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}
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void Lock() MOZ_CAPABILITY_ACQUIRE() { PR_Lock(mLock); }
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void Unlock() MOZ_CAPABILITY_RELEASE() { PR_Unlock(mLock); }
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bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT)
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MOZ_REQUIRES(this) {
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return PR_WaitCondVar(mCondVar, aTimeout) == PR_SUCCESS;
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}
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bool Notify() { return PR_NotifyCondVar(mCondVar) == PR_SUCCESS; }
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private:
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PRLock* mLock;
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PRCondVar* mCondVar;
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};
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class MOZ_SCOPED_CAPABILITY MonitorAutoLock {
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public:
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explicit MonitorAutoLock(Monitor& aMonitor) MOZ_CAPABILITY_ACQUIRE(aMonitor)
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: mMonitor(aMonitor) {
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mMonitor.Lock();
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}
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~MonitorAutoLock() MOZ_CAPABILITY_RELEASE() { mMonitor.Unlock(); }
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private:
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Monitor& mMonitor;
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};
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class MOZ_SCOPED_CAPABILITY MonitorAutoUnlock {
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public:
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explicit MonitorAutoUnlock(Monitor& aMonitor)
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MOZ_SCOPED_UNLOCK_RELEASE(aMonitor)
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: mMonitor(aMonitor) {
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mMonitor.Unlock();
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}
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~MonitorAutoUnlock() MOZ_SCOPED_UNLOCK_REACQUIRE() { mMonitor.Lock(); }
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private:
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Monitor& mMonitor;
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};
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class MOZ_CAPABILITY("mutex") Mutex {
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public:
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Mutex() : mPRLock(PR_NewLock()) {}
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~Mutex() {
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PR_DestroyLock(mPRLock);
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mPRLock = nullptr;
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}
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void Lock() MOZ_CAPABILITY_ACQUIRE() { PR_Lock(mPRLock); }
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void Unlock() MOZ_CAPABILITY_RELEASE() { PR_Unlock(mPRLock); }
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private:
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PRLock* mPRLock;
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};
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class MOZ_SCOPED_CAPABILITY AutoLock {
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public:
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explicit AutoLock(Mutex& aLock) MOZ_CAPABILITY_ACQUIRE(aLock) : mLock(aLock) {
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mLock.Lock();
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}
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~AutoLock() MOZ_CAPABILITY_RELEASE() { mLock.Unlock(); }
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private:
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Mutex& mLock;
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};
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} // namespace IOInterposer
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} // namespace mozilla
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#endif // xpcom_build_IOInterposerPrivate_h
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