gecko-dev/xpcom/base/nsAtomicRefcnt.h

68 строки
1.4 KiB
C++

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#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