mirror of
https://github.com/classilla/tenfourfox.git
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168 lines
2.8 KiB
C++
168 lines
2.8 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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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 Monitor
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{
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public:
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Monitor()
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: mLock(PR_NewLock())
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, mCondVar(PR_NewCondVar(mLock))
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{
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}
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~Monitor()
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{
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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()
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{
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PR_Lock(mLock);
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}
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void Unlock()
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{
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PR_Unlock(mLock);
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}
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bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT)
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{
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return PR_WaitCondVar(mCondVar, aTimeout) == PR_SUCCESS;
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}
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bool Notify()
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{
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return PR_NotifyCondVar(mCondVar) == PR_SUCCESS;
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}
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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 MonitorAutoLock
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{
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public:
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explicit MonitorAutoLock(Monitor& aMonitor)
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: mMonitor(aMonitor)
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{
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mMonitor.Lock();
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}
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~MonitorAutoLock()
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{
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mMonitor.Unlock();
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}
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bool Wait(PRIntervalTime aTimeout = PR_INTERVAL_NO_TIMEOUT)
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{
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return mMonitor.Wait(aTimeout);
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}
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bool Notify()
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{
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return mMonitor.Notify();
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}
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private:
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Monitor& mMonitor;
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};
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class MonitorAutoUnlock
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{
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public:
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explicit MonitorAutoUnlock(Monitor& aMonitor)
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: mMonitor(aMonitor)
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{
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mMonitor.Unlock();
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}
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~MonitorAutoUnlock()
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{
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mMonitor.Lock();
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}
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private:
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Monitor& mMonitor;
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};
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class Mutex
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{
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public:
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Mutex()
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: mPRLock(PR_NewLock())
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{
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}
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~Mutex()
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{
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PR_DestroyLock(mPRLock);
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mPRLock = nullptr;
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}
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void Lock()
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{
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PR_Lock(mPRLock);
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}
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void Unlock()
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{
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PR_Unlock(mPRLock);
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}
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private:
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PRLock* mPRLock;
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};
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class AutoLock
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{
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public:
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explicit AutoLock(Mutex& aLock)
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: mLock(aLock)
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{
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mLock.Lock();
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}
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~AutoLock()
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{
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mLock.Unlock();
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}
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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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