From 3c56f697e112c79fb5457538fdc373e348beca24 Mon Sep 17 00:00:00 2001 From: Andrew Hsieh Date: Thu, 8 Nov 2012 09:43:39 -0800 Subject: Initial checkin of unmodified gcc-5666.3.tar.gz This is the source to build gcc-4.2 for MacOSX gcc version 4.2.1 (Apple Inc. build 5666) (dot 3) http://opensource.apple.com/tarballs/gcc/gcc-5666.3.tar.gz Change-Id: I69540223f018e9d07f861fca04bd3833fc138f8b --- gcc-4.2.1-5666.3/libgomp/config/linux/sem.c | 65 +++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 gcc-4.2.1-5666.3/libgomp/config/linux/sem.c (limited to 'gcc-4.2.1-5666.3/libgomp/config/linux/sem.c') diff --git a/gcc-4.2.1-5666.3/libgomp/config/linux/sem.c b/gcc-4.2.1-5666.3/libgomp/config/linux/sem.c new file mode 100644 index 000000000..798e3f1f2 --- /dev/null +++ b/gcc-4.2.1-5666.3/libgomp/config/linux/sem.c @@ -0,0 +1,65 @@ +/* Copyright (C) 2005 Free Software Foundation, Inc. + Contributed by Richard Henderson . + + 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. */ + +/* This is a Linux specific implementation of a semaphore synchronization + mechanism for libgomp. This type is private to the library. This + implementation uses atomic instructions and the futex syscall. */ + +#include "libgomp.h" +#include "futex.h" + + +void +gomp_sem_wait_slow (gomp_sem_t *sem) +{ + while (1) + { + int val = __sync_val_compare_and_swap (sem, 0, -1); + if (val > 0) + { + if (__sync_bool_compare_and_swap (sem, val, val - 1)) + return; + } + futex_wait (sem, -1); + } +} + +void +gomp_sem_post_slow (gomp_sem_t *sem) +{ + int old, tmp = *sem, wake; + + do + { + old = tmp; + wake = old > 0 ? old + 1 : 1; + tmp = __sync_val_compare_and_swap (sem, old, wake); + } + while (old != tmp); + + futex_wake (sem, wake); +} -- cgit v1.2.3