zircon/third_party/ulib/musl/pthread/pthread_spin_lock.c

#include <errno.h>

#include "atomic.h"
#include "threads_impl.h"

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