#include "_pthread.h" static voidthread(void *x){	npe_pthread_t *t;	void *p; 	t = x;	p = t->func(t->arg);	send(t->waitchan, p);	chanfree(t->waitchan);	free(t); 	threadexits(nil);} intpthread_create(pthread_t *pt, pthread_attr_t *attr, void *(*f)(void*), void *arg){	npe_pthread_t *t;	int stacksz; 	stacksz = attr == nil ? 0 : attr->stack_size;	if(stacksz == 0)		stacksz = mainstacksize; 	t = calloc(1, sizeof(npe_pthread_t));	t->waitchan = chancreate(sizeof(void*), 0);	t->func = f;	t->arg = arg;	t->pid = proccreate(thread, t, stacksz);	*pt = (pthread_t)t; 	return 0;}