1 files changed, 28 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/pthread_spin_trylock.c b/libpthread/nptl/sysdeps/pthread_spin_trylock.c
new file mode 100644
index 000000000..c1b7b2397
--- /dev/null
+++ b/libpthread/nptl/sysdeps/pthread_spin_trylock.c
@@ -0,0 +1,28 @@
+/* Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
+
+   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 "pthreadP.h"
+
+int
+pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  int res;
+  __asm__ __volatile__ ("ldstub [%1], %0" : "=r" (res) : "r" (lock) : "memory");
+  return res == 0 ? 0 : EBUSY;
+}