Date: Tue, 2 Nov 2010 09:16:41 +0000 (UTC) From: David Xu <davidxu@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r214670 - user/davidxu/libthr/lib/libthr/thread Message-ID: <201011020916.oA29GfHH032465@svn.freebsd.org>
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Author: davidxu Date: Tue Nov 2 09:16:41 2010 New Revision: 214670 URL: http://svn.freebsd.org/changeset/base/214670 Log: Refetch lockword before retrying. Modified: user/davidxu/libthr/lib/libthr/thread/thr_mutex.c Modified: user/davidxu/libthr/lib/libthr/thread/thr_mutex.c ============================================================================== --- user/davidxu/libthr/lib/libthr/thread/thr_mutex.c Tue Nov 2 09:15:27 2010 (r214669) +++ user/davidxu/libthr/lib/libthr/thread/thr_mutex.c Tue Nov 2 09:16:41 2010 (r214670) @@ -317,6 +317,7 @@ set_lockword(struct pthread_mutex *m) while ((old & MTX_LOCKED) == 0) { if (atomic_cmpset_acq_32(&m->m_lockword, old, old|MTX_LOCKED)) return (0); + old = m->m_lockword; } return (EBUSY); }
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