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Diffstat (limited to 'libpthread/nptl/sysdeps/pthread_spin_trylock.c')
-rw-r--r--libpthread/nptl/sysdeps/pthread_spin_trylock.c28
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;
+}