Oops!

#include <pthread.h>
int pthread_create(pthread_t *tidp,
                   const pthread_attr_t attr,
           void *(*start_rtn)(void *),
           void *arg);
int pthread_join(pthread_t *tidp, void **rval_ptr);
int pthread_mutex_lock(pthread_mutex_t *mutex);
int pthread_mutex_unlock(pthread_mutex_t *mutex);
int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex);
int pthread_cond_signal(pthread_cond_t *cond);