source: azure_iot_hub/trunk/musl-1.1.18/src/thread/pthread_spin_lock.c@ 388

#include "pthread_impl.h"
#include <errno.h>

int pthread_spin_lock(pthread_spinlock_t *s)
{
        while (*(volatile int *)s || a_cas(s, 0, EBUSY)) a_spin();
        return 0;
}