2006-01-18 Richard Henderson <rth@redhat.com>

[pf3gnuchains/gcc-fork.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..fff0bbd
--- /dev/null
+++ b/libgomp/config/linux/sem.h
@@ -0,0 +1,60 @@
+/* Copyright (C) 2005 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 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.
+
+   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 Lesser General Public License for
+   more details.
+
+   You should have received a copy of the GNU Lesser General Public License 
+   along with libgomp; see the file COPYING.LIB.  If not, write to the
+   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+/* As a special exception, if you link this library with other files, some
+   of which are compiled with GCC, to produce an executable, this library
+   does not by itself cause the resulting executable to be covered by the
+   GNU General Public License.  This exception does not however invalidate
+   any other reasons why the executable file might be covered by the GNU
+   General Public License.  */
+
+/* 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 */