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tdelibs/kdecore/malloc/x86.h

42 lines
734 B

#include <sched.h>
#include <time.h>
typedef struct {
volatile unsigned int lock;
int pad0_;
} mutex_t;
#define MUTEX_INITIALIZER { 0, 0 }
static __inline__ int lock(mutex_t *m) {
int cnt = 0, r;
struct timespec tm;
for(;;) {
__asm__ __volatile__
("xchgl %0, %1"
: "=r"(r), "=m"(m->lock)
: "0"(1), "m"(m->lock)
: "memory");
if(!r)
return 0;
#ifdef _POSIX_PRIORITY_SCHEDULING
if(cnt < 50) {
sched_yield();
cnt++;
} else
#endif
{
tm.tv_sec = 0;
tm.tv_nsec = 2000001;
nanosleep(&tm, NULL);
cnt = 0;
}
}
}
static __inline__ int unlock(mutex_t *m) {
__asm __volatile ("movl $0,%0" : "=m" (m->lock));
return 0;
}