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Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
This commit is contained in:
Konstantin Belousov 2019-07-02 19:32:48 +00:00
parent 469220742e
commit 4b8b28e130
1 changed files with 5 additions and 3 deletions
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8
sys/kern/kern_umtx.c
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@ -2893,7 +2893,8 @@ do_rw_wrlock(struct thread *td, struct urwlock *rwlock, struct _umtx_time *timeo
break;
}
if (!(state & URWLOCK_WRITE_OWNER) && URWLOCK_READER_COUNT(state) == 0) {
if ((state & URWLOCK_WRITE_OWNER) == 0 &&
URWLOCK_READER_COUNT(state) == 0) {
umtxq_unbusy_unlocked(&uq->uq_key);
error = umtxq_check_susp(td);
if (error != 0)
@ -2908,9 +2909,10 @@ sleep:
error = EFAULT;
break;
}
suword32(&rwlock->rw_blocked_writers, blocked_writers+1);
suword32(&rwlock->rw_blocked_writers, blocked_writers + 1);
while ((state & URWLOCK_WRITE_OWNER) || URWLOCK_READER_COUNT(state) != 0) {
while ((state & URWLOCK_WRITE_OWNER) ||
URWLOCK_READER_COUNT(state) != 0) {
umtxq_lock(&uq->uq_key);
umtxq_insert_queue(uq, UMTX_EXCLUSIVE_QUEUE);
umtxq_unbusy(&uq->uq_key);