From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libgomp/config/linux/futex.h | 75 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) create mode 100644 libgomp/config/linux/futex.h (limited to 'libgomp/config/linux/futex.h') diff --git a/libgomp/config/linux/futex.h b/libgomp/config/linux/futex.h new file mode 100644 index 000000000..bab088a55 --- /dev/null +++ b/libgomp/config/linux/futex.h @@ -0,0 +1,75 @@ +/* Copyright (C) 2010, 2011 Free Software Foundation, Inc. + Contributed by ARM Ltd. + + 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 + . */ + +/* Provide target-specific access to the futex system call. */ + +/* The include file hierachy above us (wait.h) has pushed visibility + hidden, this will be applied to prototypes with headers we include + with the effect that we cannot link against an external function + (syscall). The solution here is to push default visibility, include + our required headers then reinstante the original visibility. */ + +#pragma GCC visibility push(default) + +#define _GNU_SOURCE +#include +#include + +#pragma GCC visibility pop + +static inline void +futex_wait (int *addr, int val) +{ + long err = syscall (SYS_futex, addr, gomp_futex_wait, val, NULL); + if (__builtin_expect (err == -ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + syscall (SYS_futex, addr, gomp_futex_wait, val, NULL); + } +} + +static inline void +futex_wake (int *addr, int count) +{ + long err = syscall (SYS_futex, addr, gomp_futex_wake, count); + if (__builtin_expect (err == -ENOSYS, 0)) + { + gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; + gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; + syscall (SYS_futex, addr, gomp_futex_wake, count); + } +} + +static inline void +cpu_relax (void) +{ + __asm volatile ("" : : : "memory"); +} + +static inline void +atomic_write_barrier (void) +{ + __sync_synchronize (); +} -- cgit v1.2.3