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rclock.h
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /*
00039 ** C++ access to NSPR locks (PRLock)
00040 */
00041 
00042 #if defined(_RCLOCK_H)
00043 #else
00044 #define _RCLOCK_H
00045 
00046 #include "rcbase.h"
00047 
00048 #include <prlock.h>
00049 
00050 class PR_IMPLEMENT(RCLock): public RCBase
00051 {
00052 public:
00053     RCLock();
00054     virtual ~RCLock();
00055 
00056     void Acquire();                 /* non-reentrant */
00057     void Release();                 /* should be by owning thread */
00058 
00059     friend class RCCondition;
00060 
00061 private:
00062     RCLock(const RCLock&);          /* can't do that */
00063     void operator=(const RCLock&);  /* nor that */
00064 
00065     PRLock *lock;
00066 };  /* RCLock */
00067 
00068 /*
00069 ** Class: RCEnter
00070 **
00071 ** In scope locks. You can only allocate them on the stack. The language
00072 ** will insure that they get released (by calling the destructor) when
00073 ** the thread leaves scope, even if via an exception.
00074 */
00075 class PR_IMPLEMENT(RCEnter)
00076 {
00077 public:
00078     ~RCEnter();                     /* releases the lock */
00079     RCEnter(RCLock*);               /* acquires the lock */
00080 
00081 private:
00082     RCLock *lock;
00083 
00084     RCEnter();
00085     RCEnter(const RCEnter&);
00086     void operator=(const RCEnter&);
00087 
00088     void *operator new(PRSize) { return NULL; }
00089     void operator delete(void*) { }
00090 };  /* RCEnter */
00091 
00092 
00093 inline RCEnter::RCEnter(RCLock* ml) { lock = ml; lock->Acquire(); }
00094 inline RCEnter::~RCEnter() { lock->Release(); lock = NULL; }
00095 
00096 #endif /* defined(_RCLOCK_H) */
00097 
00098 /* RCLock.h */