--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgomp/config/linux/x86/futex.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,153 @@
+/* Copyright (C) 2005, 2008, 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/>.  */
+
+/* Provide target-specific access to the futex system call.  */
+
+#ifdef __LP64__
+# ifndef SYS_futex
+#  define SYS_futex	202
+# endif
+
+static inline void
+futex_wait (int *addr, int val)
+{
+  register long r10 __asm__("%r10");
+  long res;
+
+  r10 = 0;
+  __asm volatile ("syscall"
+		  : "=a" (res)
+		  : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
+		    "d" (val), "r" (r10)
+		  : "r11", "rcx", "memory");
+  if (__builtin_expect (res == -ENOSYS, 0))
+    {
+      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+      r10 = 0;
+      __asm volatile ("syscall"
+		      : "=a" (res)
+		      : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wait),
+			"d" (val), "r" (r10)
+		      : "r11", "rcx", "memory");
+    }
+}
+
+static inline void
+futex_wake (int *addr, int count)
+{
+  long res;
+
+  __asm volatile ("syscall"
+		  : "=a" (res)
+		  : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
+		    "d" (count)
+		  : "r11", "rcx", "memory");
+  if (__builtin_expect (res == -ENOSYS, 0))
+    {
+      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+      __asm volatile ("syscall"
+		      : "=a" (res)
+		      : "0" (SYS_futex), "D" (addr), "S" (gomp_futex_wake),
+			"d" (count)
+		      : "r11", "rcx", "memory");
+    }
+}
+#else
+# ifndef SYS_futex
+#  define SYS_futex	240
+# endif
+
+# ifdef __PIC__
+
+static inline long
+sys_futex0 (int *addr, int op, int val)
+{
+  long res;
+
+  __asm volatile ("xchgl\t%%ebx, %2\n\t"
+		  "int\t$0x80\n\t"
+		  "xchgl\t%%ebx, %2"
+		  : "=a" (res)
+		  : "0"(SYS_futex), "r" (addr), "c"(op),
+		    "d"(val), "S"(0)
+		  : "memory");
+  return res;
+}
+
+# else
+
+static inline long
+sys_futex0 (int *addr, int op, int val)
+{
+  long res;
+
+  __asm volatile ("int $0x80"
+		  : "=a" (res)
+		  : "0"(SYS_futex), "b" (addr), "c"(op),
+		    "d"(val), "S"(0)
+		  : "memory");
+  return res;
+}
+
+# endif /* __PIC__ */
+
+static inline void
+futex_wait (int *addr, int val)
+{
+  long res = sys_futex0 (addr, gomp_futex_wait, val);
+  if (__builtin_expect (res == -ENOSYS, 0))
+    {
+      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+      sys_futex0 (addr, gomp_futex_wait, val);
+    }
+}
+
+static inline void
+futex_wake (int *addr, int count)
+{
+  long res = sys_futex0 (addr, gomp_futex_wake, count);
+  if (__builtin_expect (res == -ENOSYS, 0))
+    {
+      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+      sys_futex0 (addr, gomp_futex_wake, count);
+    }
+}
+
+#endif /* __LP64__ */
+
+static inline void
+cpu_relax (void)
+{
+  __asm volatile ("rep; nop" : : : "memory");
+}
+
+static inline void
+atomic_write_barrier (void)
+{
+  __sync_synchronize ();
+}