sync.c

См. документацию.

 
#include    "sys/sync.h"
 
bool mutex_get(mutex_t* mutex, bool wait){
    bool old_value = true;
 
    do {
        __asm__ volatile ("xchg (,%1,), %0":"=a"(old_value):"b"(mutex), "a"(old_value));
    } while (old_value && wait);
 
    return !old_value;
}
 
void mutex_release(mutex_t* mutex){
    *mutex = false;
}