2014-01-02 23:26:00 +01:00
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/* Copyright (C) 2008-2014 Free Software Foundation, Inc.
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2011-11-08 12:13:41 +01:00
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU Transactional Memory Library (libitm).
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Libitm is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libitm is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Provide access to the futex system call. */
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#include "libitm_i.h"
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#include "futex.h"
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2011-12-15 04:24:05 +01:00
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#include <futex_bits.h>
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2011-11-08 12:13:41 +01:00
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#include <errno.h>
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namespace GTM HIDDEN {
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_PRIVATE_FLAG 128L
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static long int gtm_futex_wait = FUTEX_WAIT | FUTEX_PRIVATE_FLAG;
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static long int gtm_futex_wake = FUTEX_WAKE | FUTEX_PRIVATE_FLAG;
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void
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libitm: Fixed conversion to C++11 atomics.
libitm/
* beginend.cc (GTM::gtm_thread::begin_transaction): Add comment.
(GTM::gtm_thread::try_commit): Changed memory order.
* config/linux/alpha/futex_bits.h (sys_futex0): Take atomic int
as parameter.
* config/linux/x86/futex_bits.h (sys_futex0): Same.
* config/linux/sh/futex_bits.h (sys_futex0): Same.
* config/linux/futex_bits.h (sys_futex0): Same.
* config/linux/futex.cc (futex_wait, futex_wake): Same.
* config/linux/futex.h (futex_wait, futex_wake): Same.
* config/linux/rwlock.h (gtm_rwlock::writers,
gtm_rwlock::writer_readers, gtm_rwlock::readers): Change to atomic
ints.
* config/linux/rwlock.cc (gtm_rwlock::read_lock,
gtm_rwlock::write_lock_generic, gtm_rwlock::read_unlock,
gtm_rwlock::write_unlock): Fix memory orders and fences.
* config/posix/rwlock.cc (gtm_rwlock::read_lock,
gtm_rwlock::write_lock_generic, gtm_rwlock::read_unlock,
gtm_rwlock::write_unlock): Same.
* config/linux/rwlock.h (gtm_rwlock::summary): Change to atomic int.
* method-gl.cc (gl_mg::init, gl_wt_dispatch::memtransfer_static,
gl_wt_dispatch::memset_static, gl_wt_dispatch::begin_or_restart):
Add comments.
(gl_wt_dispatch::pre_write, gl_wt_dispatch::validate,
gl_wt_dispatch::load, gl_wt_dispatch::store,
gl_wt_dispatch::try_commit, gl_wt_dispatch::rollback): Fix memory
orders and fences. Add comments.
From-SVN: r182674
2011-12-24 02:42:20 +01:00
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futex_wait (std::atomic<int> *addr, int val)
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2011-11-08 12:13:41 +01:00
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{
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long res;
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res = sys_futex0 (addr, gtm_futex_wait, val);
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if (__builtin_expect (res == -ENOSYS, 0))
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{
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gtm_futex_wait = FUTEX_WAIT;
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gtm_futex_wake = FUTEX_WAKE;
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res = sys_futex0 (addr, FUTEX_WAIT, val);
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}
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if (__builtin_expect (res < 0, 0))
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{
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if (res == -EWOULDBLOCK || res == -ETIMEDOUT)
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;
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else if (res == -EFAULT)
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GTM_fatal ("futex failed (EFAULT %p)", addr);
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else
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GTM_fatal ("futex failed (%s)", strerror(-res));
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}
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}
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long
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libitm: Fixed conversion to C++11 atomics.
libitm/
* beginend.cc (GTM::gtm_thread::begin_transaction): Add comment.
(GTM::gtm_thread::try_commit): Changed memory order.
* config/linux/alpha/futex_bits.h (sys_futex0): Take atomic int
as parameter.
* config/linux/x86/futex_bits.h (sys_futex0): Same.
* config/linux/sh/futex_bits.h (sys_futex0): Same.
* config/linux/futex_bits.h (sys_futex0): Same.
* config/linux/futex.cc (futex_wait, futex_wake): Same.
* config/linux/futex.h (futex_wait, futex_wake): Same.
* config/linux/rwlock.h (gtm_rwlock::writers,
gtm_rwlock::writer_readers, gtm_rwlock::readers): Change to atomic
ints.
* config/linux/rwlock.cc (gtm_rwlock::read_lock,
gtm_rwlock::write_lock_generic, gtm_rwlock::read_unlock,
gtm_rwlock::write_unlock): Fix memory orders and fences.
* config/posix/rwlock.cc (gtm_rwlock::read_lock,
gtm_rwlock::write_lock_generic, gtm_rwlock::read_unlock,
gtm_rwlock::write_unlock): Same.
* config/linux/rwlock.h (gtm_rwlock::summary): Change to atomic int.
* method-gl.cc (gl_mg::init, gl_wt_dispatch::memtransfer_static,
gl_wt_dispatch::memset_static, gl_wt_dispatch::begin_or_restart):
Add comments.
(gl_wt_dispatch::pre_write, gl_wt_dispatch::validate,
gl_wt_dispatch::load, gl_wt_dispatch::store,
gl_wt_dispatch::try_commit, gl_wt_dispatch::rollback): Fix memory
orders and fences. Add comments.
From-SVN: r182674
2011-12-24 02:42:20 +01:00
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futex_wake (std::atomic<int> *addr, int count)
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2011-11-08 12:13:41 +01:00
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{
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long res = sys_futex0 (addr, gtm_futex_wake, count);
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if (__builtin_expect (res == -ENOSYS, 0))
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{
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gtm_futex_wait = FUTEX_WAIT;
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gtm_futex_wake = FUTEX_WAKE;
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res = sys_futex0 (addr, FUTEX_WAKE, count);
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}
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if (__builtin_expect (res < 0, 0))
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GTM_fatal ("futex failed (%s)", strerror(-res));
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else
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return res;
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}
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} // namespace GTM
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