svn commit: r214660 - user/davidxu/libthr/lib/libthr/thread
David Xu
davidxu at FreeBSD.org
Tue Nov 2 07:46:32 UTC 2010
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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