Function ThreadMain

test/pthread/test_pthread_gcc_spinlock.c:17–40

volatile int lock = 0; // spinlock "mutex" variable

void *ThreadMain(void *arg) {
  printf("Thread started.\n");
  for (int i = 0; i < 100; ++i) {
#ifdef USE_EMSCRIPTEN_INTRINSICS
    while(emscripten_atomic_exchange_u32((void*)&lock, 1))
#else
    while(__sync_lock_test_and_set(&lock, 1))
#endif
    {
      /*nop*/;
    }
    int c = counter;
    usleep(5 * 1000); // Create contention on the lock.
    ++c;
    counter = c;
#ifdef USE_EMSCRIPTEN_INTRINSICS
    emscripten_atomic_store_u32((void*)&lock, 0);
#else
    __sync_lock_release(&lock);
#endif
  }
  printf("Thread done.\n");
  pthread_exit(0);
}

#define NUM_THREADS 8