office-gobmx/sal/osl/unx/interlck.c
2011-12-05 21:57:37 +01:00

151 lines
4.8 KiB
C

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include "system.h"
#include <osl/armarch.h>
#include <osl/interlck.h>
#include <osl/diagnose.h>
#if ( defined ( SOLARIS ) || defined ( NETBSD ) ) && defined ( SPARC )
#error please use asm/interlck_sparc.s
#elif defined ( SOLARIS) && defined ( X86 )
#error please use asm/interlck_x86.s
#elif defined ( GCC ) && ( defined ( X86 ) || defined ( X86_64 ) )
/* That's possible on x86-64 too since oslInterlockedCount is a sal_Int32 */
extern int osl_isSingleCPU;
/*****************************************************************************/
/* osl_incrementInterlockedCount */
/*****************************************************************************/
oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
{
// Fast case for old, slow, single CPU Intel machines for whom
// interlocking is a performance nightmare.
register oslInterlockedCount nCount asm("%eax");
nCount = 1;
if ( osl_isSingleCPU ) {
__asm__ __volatile__ (
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
return ++nCount;
}
#if ( __GNUC__ > 4 ) || (( __GNUC__ == 4) && ( __GNUC_MINOR__ >= 4 ))
else
return __sync_add_and_fetch (pCount, 1);
#else
else {
__asm__ __volatile__ (
"lock\n\t"
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
}
return ++nCount;
#endif
}
oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
{
register oslInterlockedCount nCount asm("%eax");
nCount = -1;
if ( osl_isSingleCPU ) {
__asm__ __volatile__ (
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
return --nCount;
}
#if ( __GNUC__ > 4 ) || (( __GNUC__ == 4) && ( __GNUC_MINOR__ >= 4 ))
else
return __sync_sub_and_fetch (pCount, 1);
#else
else {
__asm__ __volatile__ (
"lock\n\t"
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
}
return --nCount;
#endif
}
#elif ( __GNUC__ > 4 ) || (( __GNUC__ == 4) && ( __GNUC_MINOR__ >= 4 ))
oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
{
return __sync_add_and_fetch(pCount, 1);
}
oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
{
return __sync_sub_and_fetch(pCount, 1);
}
#else
/* use only if nothing else works, expensive due to single mutex for all reference counts */
static pthread_mutex_t InterLock = PTHREAD_MUTEX_INITIALIZER;
/*****************************************************************************/
/* osl_incrementInterlockedCount */
/*****************************************************************************/
oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
{
oslInterlockedCount Count;
pthread_mutex_lock(&InterLock);
Count = ++(*pCount);
pthread_mutex_unlock(&InterLock);
return (Count);
}
/*****************************************************************************/
/* osl_decrementInterlockedCount */
/*****************************************************************************/
oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
{
oslInterlockedCount Count;
pthread_mutex_lock(&InterLock);
Count = --(*pCount);
pthread_mutex_unlock(&InterLock);
return (Count);
}
#endif /* default */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */