зеркало из https://github.com/mozilla/gecko-dev.git
157 строки
4.5 KiB
C++
157 строки
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sw=4 ts=4 et :
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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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 better API.
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**/
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class NS_COM_GLUE 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 |lock|.
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*
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* @param lock An Mutex to associate with this condition variable.
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* @param name A name which can reference this monitor
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* @returns If failure, nsnull.
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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* name)
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: mLock(&aLock) {
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// |lock| 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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Init(mCvar, name, eCondVar);
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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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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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}
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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 interval = PR_INTERVAL_NO_TIMEOUT) {
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// NSPR checks for lock ownership
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return PR_WaitCondVar(mCvar, interval) == PR_SUCCESS
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? NS_OK : NS_ERROR_FAILURE;
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}
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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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// NSPR checks for lock ownership
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return PR_NotifyCondVar(mCvar) == PR_SUCCESS
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? 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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// NSPR checks for lock ownership
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return PR_NotifyAllCondVar(mCvar) == PR_SUCCESS
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? 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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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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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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