#include <alef.h>#include "queue.h" aggr Qelem {	void	*p;	Qelem	*next;}; voidQueue.putq(Queue *q, void *p){	Qelem *qelem; 	alloc qelem;	q->lock();	qelem->p = p;	qelem->next = q->elems;	q->elems = qelem;	q->unlock();} void *Queue.getq(Queue *q){	Qelem	*next;	void	*p; 	p = nil;	q->lock();	if(q->elems != nil) {		p = q->elems->p;		next = q->elems->next;		unalloc q->elems;		q->elems = next;	}	q->unlock();	return p;} intQueue.isempty(Queue *q){	int ret; 	q->lock();	if(q->elems == nil)		ret = 1;	else		ret = 0;	q->unlock();	return ret;}