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add and fix testandset for x86_64

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This commit is contained in:
gbeauche 2004-05-20 17:46:49 +00:00
parent 3a033cf79b
commit d9168c9869
1 changed files with 4 additions and 5 deletions
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9
SheepShaver/src/Unix/sysdeps.h
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@ -249,15 +249,14 @@ static inline int testandset(volatile int *p)
}
#endif
#ifdef __i386__
#if defined(__i386__) || defined(__x86_64__)
#define HAVE_TEST_AND_SET 1
static inline int testandset(volatile int *p)
{
int ret;
long int readval;
long int ret;
/* Note: the "xchg" instruction does not need a "lock" prefix */
__asm__ __volatile__("xchgl %0, %1"
: "=r" (ret), "=m" (*p), "=a" (readval)
__asm__ __volatile__("xchgl %k0, %1"
: "=r" (ret), "=m" (*p)
: "0" (1), "m" (*p)
: "memory");
return ret;