Add generic versions of pthread_spin_lock and pthread_spin_trylock.

1 files changed, 27 insertions, 0 deletions

diff --git a/nptl/pthread_spin_trylock.c b/nptl/pthread_spin_trylock.c
new file mode 100644
index 0000000000..db9372cb58
--- /dev/null
+++ b/nptl/pthread_spin_trylock.c
@@ -0,0 +1,27 @@
+/* pthread_spin_trylock -- trylock a spin lock.  Generic version.
+   Copyright (C) 2012 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <errno.h>
+#include <atomic.h>
+#include "pthreadP.h"
+
+int
+pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  return atomic_exchange_acq (lock, 1) ? EBUSY : 0;
+}