Imported gcc-4.4.3

[msp430-gcc.git] / libgomp / config / linux / sem.h

diff --git a/libgomp/config/linux/sem.h b/libgomp/config/linux/sem.h
new file mode 100644 (file)
index 0000000..9b0f0f8
--- /dev/null
+++ b/libgomp/config/linux/sem.h
@@ -0,0 +1,57 @@
+/* Copyright (C) 2005, 2009 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 semaphore synchronization
+   mechanism for libgomp.  This type is private to the library.  This 
+   implementation uses atomic instructions and the futex syscall.  */
+
+#ifndef GOMP_SEM_H
+#define GOMP_SEM_H 1
+
+typedef int gomp_sem_t;
+
+static inline void gomp_sem_init (gomp_sem_t *sem, int value)
+{
+  *sem = value;
+}
+
+extern void gomp_sem_wait_slow (gomp_sem_t *);
+static inline void gomp_sem_wait (gomp_sem_t *sem)
+{
+  if (!__sync_bool_compare_and_swap (sem, 1, 0))
+    gomp_sem_wait_slow (sem);
+}
+
+extern void gomp_sem_post_slow (gomp_sem_t *);
+static inline void gomp_sem_post (gomp_sem_t *sem)
+{
+  if (!__sync_bool_compare_and_swap (sem, 0, 1))
+    gomp_sem_post_slow (sem);
+}
+
+static inline void gomp_sem_destroy (gomp_sem_t *sem)
+{
+}
+
+#endif /* GOMP_SEM_H */