fusl/src/thread/__lock.c

#include "pthread_impl.h"

void __lock(volatile int* l) {
  if (libc.threads_minus_1)
    while (a_swap(l, 1))
      __wait(l, l + 1, 1, 1);
}

void __unlock(volatile int* l) {
  if (l[0]) {
    a_store(l, 0);
    if (l[1])
      __wake(l, 1, 1);
  }
}