mirror of
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145 lines
3.2 KiB
C++
145 lines
3.2 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_CondVar_h
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#define mozilla_CondVar_h
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#include "prcvar.h"
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#include "mozilla/BlockingResourceBase.h"
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#include "mozilla/Mutex.h"
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#ifdef MOZILLA_INTERNAL_API
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#include "GeckoProfiler.h"
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#endif //MOZILLA_INTERNAL_API
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namespace mozilla {
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/**
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* CondVar
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* Vanilla condition variable. Please don't use this unless you have a
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* compelling reason --- Monitor provides a simpler API.
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*/
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class CondVar : BlockingResourceBase
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{
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public:
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/**
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* CondVar
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*
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* The CALLER owns |aLock|.
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*
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* @param aLock A Mutex to associate with this condition variable.
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* @param aName A name which can reference this monitor
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* @returns If failure, nullptr.
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* If success, a valid Monitor* which must be destroyed
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* by Monitor::DestroyMonitor()
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**/
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CondVar(Mutex& aLock, const char* aName)
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: BlockingResourceBase(aName, eCondVar)
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, mLock(&aLock)
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{
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MOZ_COUNT_CTOR(CondVar);
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// |aLock| must necessarily already be known to the deadlock detector
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mCvar = PR_NewCondVar(mLock->mLock);
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if (!mCvar) {
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NS_RUNTIMEABORT("Can't allocate mozilla::CondVar");
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}
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}
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/**
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* ~CondVar
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* Clean up after this CondVar, but NOT its associated Mutex.
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**/
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~CondVar()
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{
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NS_ASSERTION(mCvar && mLock,
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"improperly constructed CondVar or double free");
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PR_DestroyCondVar(mCvar);
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mCvar = 0;
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mLock = 0;
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MOZ_COUNT_DTOR(CondVar);
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}
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#ifndef DEBUG
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/**
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* Wait
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* @see prcvar.h
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**/
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nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT)
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{
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#ifdef MOZILLA_INTERNAL_API
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GeckoProfilerSleepRAII profiler_sleep;
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#endif //MOZILLA_INTERNAL_API
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// NSPR checks for lock ownership
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return PR_WaitCondVar(mCvar, aInterval) == PR_SUCCESS ? NS_OK :
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NS_ERROR_FAILURE;
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}
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#else
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nsresult Wait(PRIntervalTime aInterval = PR_INTERVAL_NO_TIMEOUT);
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#endif // ifndef DEBUG
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/**
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* Notify
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* @see prcvar.h
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**/
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nsresult Notify()
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{
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// NSPR checks for lock ownership
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return PR_NotifyCondVar(mCvar) == PR_SUCCESS ? NS_OK : NS_ERROR_FAILURE;
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}
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/**
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* NotifyAll
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* @see prcvar.h
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**/
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nsresult NotifyAll()
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{
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// NSPR checks for lock ownership
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return PR_NotifyAllCondVar(mCvar) == PR_SUCCESS ? NS_OK : NS_ERROR_FAILURE;
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}
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#ifdef DEBUG
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/**
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* AssertCurrentThreadOwnsMutex
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* @see Mutex::AssertCurrentThreadOwns
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**/
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void AssertCurrentThreadOwnsMutex()
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{
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mLock->AssertCurrentThreadOwns();
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}
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/**
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* AssertNotCurrentThreadOwnsMutex
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* @see Mutex::AssertNotCurrentThreadOwns
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**/
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void AssertNotCurrentThreadOwnsMutex()
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{
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mLock->AssertNotCurrentThreadOwns();
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}
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#else
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void AssertCurrentThreadOwnsMutex() {}
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void AssertNotCurrentThreadOwnsMutex() {}
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#endif // ifdef DEBUG
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private:
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CondVar();
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CondVar(CondVar&);
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CondVar& operator=(CondVar&);
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Mutex* mLock;
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PRCondVar* mCvar;
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};
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} // namespace mozilla
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#endif // ifndef mozilla_CondVar_h
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