D60959.1793502079.diff
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	diff --git a/lib/libthr/thread/thr_rwlock.c b/lib/libthr/thread/thr_rwlock.c
	--- a/lib/libthr/thread/thr_rwlock.c
	+++ b/lib/libthr/thread/thr_rwlock.c
	@@ -205,6 +205,9 @@
	return (ret);
	}

	+ if (__predict_false(prwlock->owner == TID(curthread)))
	+ return (EDEADLK);
	+
	if (__predict_false(abstime &&
	(abstime->tv_nsec >= 1000000000 \|\| abstime->tv_nsec < 0)))
	return (EINVAL);
	@@ -276,6 +279,8 @@
	ret = _thr_rwlock_tryrdlock(&prwlock->lock, flags);
	if (ret == 0)
	curthread->rdlock_count++;
	+ else if (__predict_false(prwlock->owner == TID(curthread)))
	+ ret = EDEADLK;
	return (ret);
	}

	@@ -295,6 +300,8 @@
	ret = _thr_rwlock_trywrlock(&prwlock->lock);
	if (ret == 0)
	prwlock->owner = TID(curthread);
	+ else if (__predict_false(prwlock->owner == TID(curthread)))
	+ ret = EDEADLK;
	return (ret);
	}

	@@ -319,6 +326,9 @@
	return (ret);
	}

	+ if (__predict_false(prwlock->owner == TID(curthread)))
	+ return (EDEADLK);
	+
	if (__predict_false(abstime &&
	(abstime->tv_nsec >= 1000000000 \|\| abstime->tv_nsec < 0)))
	return (EINVAL);