strepsirrhini/office-gobmx
9
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

implement lockless osl_[increment|decrement]InterlockedCount for GCC on X86

Browse source
This commit is contained in:
Jens-Heiner Rechtien 2001-02-23 18:25:55 +00:00
parent 9cdb631676
commit 543e104cf7
1 changed files with 41 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

43
sal/osl/unx/interlck.c
View file

@ -2,9 +2,9 @@
*
* $RCSfile: interlck.c,v $
*
* $Revision: 1.1.1.1 $
* $Revision: 1.2 $
*
* last change: $Author: hr $ $Date: 2000-09-18 15:17:21 $
* last change: $Author: hr $ $Date: 2001-02-23 19:25:55 $
*
* The Contents of this file are made available subject to the terms of
* either of the following licenses
@ -65,6 +65,44 @@
#include <osl/interlck.h>
#include <osl/diagnose.h>
#if (defined ( __SUNPRO_C ) || defined ( __SUNPRO_CC )) && defined ( SPARC )
#error please use asm/interlck_sparc.s
#elif defined ( GCC ) && defined ( X86 )
/*****************************************************************************/
/* osl_incrementInterlockedCount */
/*****************************************************************************/
oslInterlockedCount SAL_CALL osl_incrementInterlockedCount(oslInterlockedCount* pCount)
{
oslInterlockedCount nCount;
__asm__ __volatile__ (
"movl $1, %0\n\t"
"lock\n\t"
"xadd %0, %2\n\t"
"incl %0"
: "=a" (nCount), "=m" (*pCount)
: "m" (*pCount)
: "memory");
}
oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount* pCount)
{
oslInterlockedCount nCount;
__asm__ __volatile__ (
"movl $-1, %0\n\t"
"lock\n\t"
"xadd %0, %2\n\t"
"decl %0"
: "=a" (nCount), "=m" (*pCount)
: "m" (*pCount)
: "memory");
}
#elif
/* use only if nothinig else works, expensive due to single mutex for all reference counts */
static pthread_mutex_t InterLock = PTHREAD_MUTEX_INITIALIZER;
/*****************************************************************************/
@ -95,3 +133,4 @@ oslInterlockedCount SAL_CALL osl_decrementInterlockedCount(oslInterlockedCount*
return (Count);
}
#endif /* expensive default, works everywhere */