1991/0428/gnot/lock.c (diff list | history)

1991/0311/sys/src/9/gnot/lock.c:57,111 – 1991/0428/sys/src/9/gnot/lock.c:57,59 (short | long | prev | next)
1990/03091		l->pc = 0;
1990/0403		l->key = 0;
1990/03091		}                  void qlock(QLock *q) { Proc *p;                  if(canlock(&q->use)) return; lock(&q->queue); if(canlock(&q->use)){ unlock(&q->queue); return; } p = q->tail; if(p == 0) q->head = u->p; else p->qnext = u->p; q->tail = u->p; u->p->qnext = 0; u->p->state = Queueing;
1990/05313		u->p->qlock = q; /* DEBUG */
1990/03091		unlock(&q->queue); sched(); }
1990/0312		int canqlock(QLock *q) { return canlock(&q->use); }
1990/03091		void qunlock(QLock *q) { Proc *p;                  lock(&q->queue);
1991/0311		if(u) u->p->qlock = 0;
1990/03091		if(q->head){ p = q->head; q->head = p->qnext; if(q->head == 0) q->tail = 0; unlock(&q->queue); ready(p); }else{ unlock(&q->use); unlock(&q->queue); } }