Merge remote-tracking branch 'origin/upstream'

1 files changed, 39 insertions, 0 deletions

diff --git a/libpthread/nptl/sysdeps/pthread_spin_lock.c b/libpthread/nptl/sysdeps/pthread_spin_lock.c
new file mode 100644
index 000000000..2dfcd3c24
--- /dev/null
+++ b/libpthread/nptl/sysdeps/pthread_spin_lock.c
@@ -0,0 +1,39 @@
+/* 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 "pthreadP.h"
+
+int
+pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  __asm__ __volatile__
+    ("1: ldstub [%0], %%g2\n"
+     "   orcc   %%g2, 0x0, %%g0\n"
+     "   bne,a  2f\n"
+     "   ldub   [%0], %%g2\n"
+     ".subsection 2\n"
+     "2: orcc   %%g2, 0x0, %%g0\n"
+     "   bne,a  2b\n"
+     "   ldub   [%0], %%g2\n"
+     "   b,a    1b\n"
+     ".previous"
+     : /* no outputs */
+     : "r" (lock)
+     : "g2", "memory", "cc");
+  return 0;
+}