extern int errno;
typedef int thread_t;
thread_t thr_self(void) { errno = -1; return 0; }
int thr_create(void) { errno = -1; return -1; }
int mutex_init(void) { errno = -1; return -1; }
int mutex_destroy(void) { errno = -1; return -1; }
int mutex_lock(void) { errno = -1; return -1; }
int mutex_unlock(void) { errno = -1; return -1; }
int cond_init(void) { errno = -1; return -1; }
int cond_destroy(void) { errno = -1; return -1; }
int cond_wait(void) { errno = -1; return -1; }
int cond_signal(void) { errno = -1; return -1; }
int cond_broadcast(void) { errno = -1; return -1; }