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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
*/
#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 ( __GNUC__ ) && ( 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.
if ( osl_isSingleCPU ) {
register oslInterlockedCount nCount asm("%eax");
nCount = 1;
__asm__ __volatile__ (
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
return ++nCount;
}
#if defined( HAVE_GCC_BUILTIN_ATOMIC )
else
return __sync_add_and_fetch (pCount, 1);
#else
else {
register oslInterlockedCount nCount asm("%eax");
nCount = 1;
__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)
{
if ( osl_isSingleCPU ) {
register oslInterlockedCount nCount asm("%eax");
nCount = -1;
__asm__ __volatile__ (
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
return --nCount;
}
#if defined( HAVE_GCC_BUILTIN_ATOMIC )
else
return __sync_sub_and_fetch (pCount, 1);
#else
else {
register oslInterlockedCount nCount asm("%eax");
nCount = -1;
__asm__ __volatile__ (
"lock\n\t"
"xaddl %0, %1\n\t"
: "+r" (nCount), "+m" (*pCount)
: /* nothing */
: "memory");
return --nCount;
}
#endif
}
#elif defined( HAVE_GCC_BUILTIN_ATOMIC )
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: */
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