diff options
Diffstat (limited to 'sys/src/libc/9sys/qlock.c')
| -rw-r--r-- | sys/src/libc/9sys/qlock.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/sys/src/libc/9sys/qlock.c b/sys/src/libc/9sys/qlock.c index e968080be..ae30b5f36 100644 --- a/sys/src/libc/9sys/qlock.c +++ b/sys/src/libc/9sys/qlock.c @@ -39,10 +39,10 @@ getqlp(void) abort(); if(_tas(&(p->inuse)) == 0){ ql.p = p; - p->next = nil; break; } } + p->next = nil; return p; } @@ -128,12 +128,11 @@ rlock(RWLock *q) mp = getqlp(); p = q->tail; - if(p == 0) + if(p == nil) q->head = mp; else p->next = mp; q->tail = mp; - mp->next = nil; mp->state = QueuingR; unlock(&q->lock); @@ -199,14 +198,13 @@ wlock(RWLock *q) } /* wait */ - p = q->tail; mp = getqlp(); + p = q->tail; if(p == nil) q->head = mp; else p->next = mp; q->tail = mp; - mp->next = nil; mp->state = QueuingW; unlock(&q->lock); @@ -286,7 +284,7 @@ rsleep(Rendez *r) { QLp *t, *me; - if(!r->l) + if(r->l == nil) abort(); lock(&r->l->lock); /* we should hold the qlock */ @@ -300,12 +298,11 @@ rsleep(Rendez *r) r->head = me; else r->tail->next = me; - me->next = nil; r->tail = me; /* pass the qlock to the next guy */ t = r->l->head; - if(t){ + if(t != nil){ r->l->head = t->next; if(r->l->head == nil) r->l->tail = nil; @@ -333,7 +330,7 @@ rwakeup(Rendez *r) * put on front so guys that have been waiting will not get starved */ - if(!r->l) + if(r->l == nil) abort(); lock(&r->l->lock); if(!r->l->locked) |