Imported gcc-4.4.3

[msp430-gcc.git] / libgomp / config / linux / s390 / futex.h

diff --git a/libgomp/config/linux/s390/futex.h b/libgomp/config/linux/s390/futex.h
new file mode 100644 (file)
index 0000000..060032d
--- /dev/null
+++ b/libgomp/config/linux/s390/futex.h
@@ -0,0 +1,84 @@
+/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
+   Contributed by Jakub Jelinek <jakub@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.  */
+
+#include <sys/syscall.h>
+
+static inline long
+sys_futex0 (int *addr, int op, int val)
+{
+  register long int gpr2  __asm__ ("2");
+  register long int gpr3  __asm__ ("3");
+  register long int gpr4  __asm__ ("4");
+  register long int gpr5  __asm__ ("5");
+
+  gpr2 = (long) addr;
+  gpr3 = op;
+  gpr4 = val;
+  gpr5 = 0;
+
+  __asm volatile ("svc %b1"
+                 : "=d" (gpr2)
+                 : "i" (SYS_futex),
+                   "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5)
+                 : "memory");
+  return gpr2;
+}
+
+static inline void
+futex_wait (int *addr, int val)
+{
+  long err = sys_futex0 (addr, gomp_futex_wait, val);
+  if (__builtin_expect (err == -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 err = sys_futex0 (addr, gomp_futex_wake, count);
+  if (__builtin_expect (err == -ENOSYS, 0))
+    {
+      gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
+      gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
+      sys_futex0 (addr, gomp_futex_wake, count);
+    }
+}
+
+static inline void
+cpu_relax (void)
+{
+  __asm volatile ("" : : : "memory");
+}
+
+static inline void
+atomic_write_barrier (void)
+{
+  __sync_synchronize ();
+}