ref: 2bf42bfc7ce8fae05401547e03cda1a181f89a95
dir: /libnpe_pthread/pthread_join.c/
#include "_pthread.h"
int
pthread_join(pthread_t pt, void **res)
{
	npe_pthread_t *t;
	t = (npe_pthread_t*)pt;
	if(t->waitchan != nil)
		recv(t->waitchan, res);
	return 0;
}