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From: David Xu <davidxu@FreeBSD.org>
Date: Sun, 12 Aug 2012 00:56:56 +0000 (UTC)
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Subject: svn commit: r239206 - head/lib/libthr/thread
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Author: davidxu
Date: Sun Aug 12 00:56:56 2012
New Revision: 239206
URL: http://svn.freebsd.org/changeset/base/239206

Log:
  Do defered mutex wakeup once.

Modified:
  head/lib/libthr/thread/thr_cond.c

Modified: head/lib/libthr/thread/thr_cond.c
==============================================================================
--- head/lib/libthr/thread/thr_cond.c	Sun Aug 12 00:46:15 2012	(r239205)
+++ head/lib/libthr/thread/thr_cond.c	Sun Aug 12 00:56:56 2012	(r239206)
@@ -239,6 +239,7 @@ cond_wait_user(struct pthread_cond *cvp,
 		_thr_clear_wake(curthread);
 		_sleepq_unlock(cvp);
 		if (defered) {
+			defered = 0;
 			if ((mp->m_lock.m_owner & UMUTEX_CONTESTED) == 0)
 				(void)_umtx_op_err(&mp->m_lock, UMTX_OP_MUTEX_WAKE2,
 					 mp->m_lock.m_flags, 0, 0);