gecko-dev/xpcom/base/nsAtomicRefcnt.h
2011-03-28 15:58:49 -04:00

100 lines
2.9 KiB
C++

/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla code.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Justin Lebar <justin.lebar@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsAtomicRefcnt_h__
#define nsAtomicRefcnt_h__
#include "nscore.h"
#include "pratom.h"
class nsAutoRefCnt;
// This header defines functions for modifying refcounts which wrap the
// PR_ATOMIC_* macros.
#if defined(XP_WIN)
#if PR_BYTES_PER_LONG == 4
typedef volatile long nsAtomicRefcnt;
#else
#error "Windows should have 4 bytes per long."
#endif
#else /* !defined(XP_WIN) */
typedef PRInt32 nsAtomicRefcnt;
#endif
inline PRInt32
NS_AtomicIncrementRefcnt(PRInt32 &refcnt)
{
return PR_ATOMIC_INCREMENT(&refcnt);
}
inline nsrefcnt
NS_AtomicIncrementRefcnt(nsrefcnt &refcnt)
{
return (nsrefcnt) PR_ATOMIC_INCREMENT((nsAtomicRefcnt*)&refcnt);
}
inline nsrefcnt
NS_AtomicIncrementRefcnt(nsAutoRefCnt &refcnt)
{
// This cast is safe since nsAtomicRefCnt contains just one member, its refcount.
return (nsrefcnt) PR_ATOMIC_INCREMENT((nsAtomicRefcnt*)&refcnt);
}
inline nsrefcnt
NS_AtomicDecrementRefcnt(nsrefcnt &refcnt)
{
return (nsrefcnt) PR_ATOMIC_DECREMENT((nsAtomicRefcnt*)&refcnt);
}
inline nsrefcnt
NS_AtomicDecrementRefcnt(nsAutoRefCnt &refcnt)
{
return (nsrefcnt) PR_ATOMIC_DECREMENT((nsAtomicRefcnt*)&refcnt);
}
inline PRInt32
NS_AtomicDecrementRefcnt(PRInt32 &refcnt)
{
return PR_ATOMIC_DECREMENT(&refcnt);
}
#endif