int st_thread_join(_st_thread_t *thread, void **retvalp)
{
_st_cond_t *term = thread->term;
/* Can't join a non-joinable thread */
if (term == NULL) {
errno = EINVAL;
return -1;
}
if (_ST_CURRENT_THREAD() == thread) {
errno = EDEADLK;
return -1;
}
/* Multiple threads can't wait on the same joinable thread */
if (term->wait_q.next != &term->wait_q) {
errno = EINVAL;
return -1;
}
while (thread->state != _ST_ST_ZOMBIE) {
if (st_cond_timedwait(term, ST_UTIME_NO_TIMEOUT) != 0)
return -1;
}
if (retvalp)
*retvalp = thread->retval;
/*
* Remove target thread from the zombie queue and make it runnable.
* When it gets scheduled later, it will do the clean up.
*/
thread->state = _ST_ST_RUNNABLE;
_ST_DEL_ZOMBIEQ(thread);
_ST_ADD_RUNQ(thread);
return 0;
}
int st_cond_wait(_st_cond_t *cvar)
{
return st_cond_timedwait(cvar, ST_UTIME_NO_TIMEOUT);
}
