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-rw-r--r--libgomp/config/linux/s390/futex.h84
1 files changed, 84 insertions, 0 deletions
diff --git a/libgomp/config/linux/s390/futex.h b/libgomp/config/linux/s390/futex.h
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+++ b/libgomp/config/linux/s390/futex.h
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+/* 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 ();
+}