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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: interlck.c,v $
* $Revision: 1.14 $
*
* 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/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)
{
register oslInterlockedCount nCount asm("%eax");
nCount = 1;
if ( osl_isSingleCPU ) {
__asm__ __volatile__ (
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
}
else {
__asm__ __volatile__ (
"lock\n\t"
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
}
return ++nCount;
}
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");
}
else {
__asm__ __volatile__ (
"lock\n\t"
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
}
return --nCount;
}
#elif defined ( GCC ) && defined ( POWERPC )
/*****************************************************************************/
/* osl_incrementInterlockedCount */
/*****************************************************************************/
oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
{
/* "addi" doesn't work with r0 as second parameter */
register oslInterlockedCount nCount __asm__ ("r4");
__asm__ __volatile__ (
"1: lwarx %0,0,%2\n\t"
" addi %0,%0,1\n\t"
" stwcx. %0,0,%2\n\t"
" bne- 1b\n\t"
" isync"
: "=&r" (nCount), "=m" (*pCount)
: "r" (pCount)
: "memory");
return nCount;
}
oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
{
/* "subi" doesn't work with r0 as second parameter */
register oslInterlockedCount nCount __asm__ ("r4");
__asm__ __volatile__ (
"1: lwarx %0,0,%2\n\t"
" subi %0,%0,1\n\t"
" stwcx. %0,0,%2\n\t"
" bne- 1b\n\t"
" isync"
: "=&r" (nCount), "=m" (*pCount)
: "r" (pCount)
: "memory");
return nCount;
}
#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 */
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