Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 66 insertions, 0 deletions

diff --git a/gcc-4.9/libgomp/config/linux/mutex.h b/gcc-4.9/libgomp/config/linux/mutex.h
new file mode 100644
index 000000000..b36d33a2d
--- /dev/null
+++ b/gcc-4.9/libgomp/config/linux/mutex.h
@@ -0,0 +1,66 @@
+/* Copyright (C) 2005-2014 Free Software Foundation, Inc.
+   Contributed by Richard Henderson <rth@redhat.com>.
+
+   This file is part of the GNU OpenMP Library (libgomp).
+
+   Libgomp is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   Libgomp 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 General Public License for
+   more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This is a Linux specific implementation of a mutex synchronization
+   mechanism for libgomp.  This type is private to the library.  This
+   implementation uses atomic instructions and the futex syscall.  */
+
+#ifndef GOMP_MUTEX_H
+#define GOMP_MUTEX_H 1
+
+typedef int gomp_mutex_t;
+
+#define GOMP_MUTEX_INIT_0 1
+
+extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex, int);
+extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex);
+
+static inline void
+gomp_mutex_init (gomp_mutex_t *mutex)
+{
+  *mutex = 0;
+}
+
+static inline void
+gomp_mutex_destroy (gomp_mutex_t *mutex)
+{
+}
+
+static inline void
+gomp_mutex_lock (gomp_mutex_t *mutex)
+{
+  int oldval = 0;
+  if (!__atomic_compare_exchange_n (mutex, &oldval, 1, false,
+				    MEMMODEL_ACQUIRE, MEMMODEL_RELAXED))
+    gomp_mutex_lock_slow (mutex, oldval);
+}
+
+static inline void
+gomp_mutex_unlock (gomp_mutex_t *mutex)
+{
+  int wait = __atomic_exchange_n (mutex, 0, MEMMODEL_RELEASE);
+  if (__builtin_expect (wait < 0, 0))
+    gomp_mutex_unlock_slow (mutex);
+}
+#endif /* GOMP_MUTEX_H */