x86.h Source File (kdecore Library)

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# x86.h

    00001 #include <sched.h>
    00002 #include <time.h>
    00003
    00004 typedef struct {
    00005   volatile unsigned int lock;
    00006   int pad0_;
    00007 } mutex_t;
    00008
    00009 #define MUTEX_INITIALIZER          { 0, 0 }
    00010
    00011 static __inline__ int lock(mutex_t *m) {
    00012   int cnt = 0, r;
    00013   struct timespec tm;
    00014
    00015   for(;;) {
    00016     __asm__ __volatile__
    00017       ("xchgl %0, %1"
    00018        : "=r"(r), "=m"(m->lock)
    00019        : "0"(1), "m"(m->lock)
    00020        : "memory");
    00021     if(!r)
    00022       return 0;
    00023 #ifdef _POSIX_PRIORITY_SCHEDULING
    00024     if(cnt < 50) {
    00025       sched_yield();
    00026       cnt++;
    00027     } else
    00028 #endif
    00029         {
    00030       tm.tv_sec = 0;
    00031       tm.tv_nsec = 2000001;
    00032       nanosleep(&tm, NULL);
    00033       cnt = 0;
    00034     }
    00035   }
    00036 }
    00037
    00038 static __inline__ int unlock(mutex_t *m) {
    00039   __asm __volatile ("movl $0,%0" : "=m" (m->lock));
    00040   return 0;
    00041 }

This file is part of the documentation for kdelibs Version 3.1.5.
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