Date: Tue, 2 Nov 2010 07:46:31 +0000 (UTC) From: David Xu <davidxu@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r214660 - user/davidxu/libthr/lib/libthr/thread Message-ID: <201011020746.oA27kVZL026851@svn.freebsd.org>
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Author: davidxu Date: Tue Nov 2 07:46:31 2010 New Revision: 214660 URL: http://svn.freebsd.org/changeset/base/214660 Log: Add missing function. Modified: user/davidxu/libthr/lib/libthr/thread/thr_umtx.c Modified: user/davidxu/libthr/lib/libthr/thread/thr_umtx.c ============================================================================== --- user/davidxu/libthr/lib/libthr/thread/thr_umtx.c Tue Nov 2 06:58:01 2010 (r214659) +++ user/davidxu/libthr/lib/libthr/thread/thr_umtx.c Tue Nov 2 07:46:31 2010 (r214660) @@ -297,6 +297,19 @@ _thr_rwl_unlock(struct urwlock *rwlock) PANIC("unlock error"); } +int +__thr_umtx_lock(volatile umtx_t *mtx) +{ + int v; + + do { + v = *mtx; + if (v == 2 || atomic_cmpset_acq_int(mtx, 1, 2)) + _thr_umtx_wait_uint(mtx, 2, NULL, 0); + } while (!atomic_cmpset_acq_int(mtx, 0, 2)); + return (0); +} + #define LOOPS 500 int
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