configure.tgt: Enable futex for MIPS.

* configure.tgt: Enable futex for MIPS.
* config/linux/mips/futex.h: New file.

Co-Authored-By: Chao-ying Fu <fu@mips.com>

From-SVN: r138214

libgomp/ChangeLog

+2008-07-28  Ilie Garbacea  <ilie@mips.com>
+	    Chao-ying Fu  <fu@mips.com>
+
+	* configure.tgt: Enable futex for MIPS.
+	* config/linux/mips/futex.h: New file.
+
 2008-07-16  Jakub Jelinek  <jakub@redhat.com>
 
 	* team.c (gomp_team_end): Free team immediately if it has

libgomp/config/linux/mips/futex.h

+/* Copyright (C) 2005, 2008 Free Software Foundation, Inc.
+   Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.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.  */
+
+/* Provide target-specific access to the futex system call.  */
+
+#include <sys/syscall.h>
+#define FUTEX_WAIT 0
+#define FUTEX_WAKE 1
+
+static inline void
+sys_futex0 (int *addr, int op, int val)
+{
+  register unsigned long __v0 asm("$2") = (unsigned long) SYS_futex;
+  register unsigned long __a0 asm("$4") = (unsigned long) addr;
+  register unsigned long __a1 asm("$5") = (unsigned long) op;
+  register unsigned long __a2 asm("$6") = (unsigned long) val;
+  register unsigned long __a3 asm("$7") = 0;
+
+  __asm volatile ("syscall"
+		  /* returns $a3 (errno), $v0 (return value) */
+		  : "=r" (__v0), "=r" (__a3)
+		  /* arguments in v0 (syscall) a0-a3 */
+		  : "r" (__v0), "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3)
+		  /* clobbers at, v1, t0-t9, memory */
+		  : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14",
+		    "$15", "$24", "$25", "memory");
+}
+
+static inline void
+futex_wait (int *addr, int val)
+{
+  sys_futex0 (addr, FUTEX_WAIT, val);
+}
+
+static inline void
+futex_wake (int *addr, int count)
+{
+  sys_futex0 (addr, FUTEX_WAKE, count);
+}
+
+static inline void
+cpu_relax (void)
+{
+  __asm volatile ("" : : : "memory");
+}
+
+static inline void
+atomic_write_barrier (void)
+{
+  __sync_synchronize ();
+}

libgomp/configure.tgt

@@ -35,6 +35,10 @@ if test $enable_linux_futex = yes; then
 	config_path="linux/ia64 linux posix"
 	;;
 
+    mips*-*-linux*)
+	config_path="linux/mips linux posix"
+	;;
+
     powerpc*-*-linux*)
 	config_path="linux/powerpc linux posix"
 	;;