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MicroBlaze: Remove custom pthread_once implementation on microblaze.

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2015-01-06  Torvald Riegel <triegel@redhat.com>

  * sysdeps/unix/sysv/linux/microblaze/pthread_once.c: Delete file.

Signed-off-by: Torvald Riegel <triegel@redhat.com>
Signed-off-by: David Holsgrove <david.holsgrove@xilinx.com>
This commit is contained in:
Torvald Riegel 2014-12-08 18:30:33 +01:00 committed by David Holsgrove
parent cf71e44f1b
commit e1cfbd0c37
2 changed files with 4 additions and 89 deletions
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ChangeLog
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@ -1,3 +1,7 @@
2015-01-09 Torvald Riegel <triegel@redhat.com>
* sysdeps/unix/sysv/linux/microblaze/pthread_once.c: Delete file.
2015-01-09 David Holsgrove <david.holsgrove@xilinx.com>
* sysdeps/microblaze/jmpbuf-unwind.h (_jmpbuf_sp): Declare SP as void

89
sysdeps/unix/sysv/linux/microblaze/pthread_once.c
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@ -1,89 +0,0 @@
/* Copyright (C) 2004-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include "pthreadP.h"
#include <lowlevellock.h>
unsigned long int __fork_generation attribute_hidden;
static void
clear_once_control (void *arg)
{
pthread_once_t *once_control = (pthread_once_t *) arg;
*once_control = 0;
lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
}
int
__pthread_once (pthread_once_t *once_control, void (*init_routine) (void))
{
for (;;)
{
int oldval;
int newval;
/* Pseudo code:
newval = __fork_generation | 1;
oldval = *once_control;
if ((oldval & 2) == 0)
*once_control = newval;
Do this atomically. */
do
{
newval = __fork_generation | 1;
oldval = *once_control;
if (oldval & 2)
break;
} while (atomic_compare_and_exchange_val_acq (once_control, newval, oldval) != oldval);
/* Check if the initializer has already been done. */
if ((oldval & 2) != 0)
return 0;
/* Check if another thread already runs the initializer. */
if ((oldval & 1) == 0)
break;
/* Check whether the initializer execution was interrupted by a fork. */
if (oldval != newval)
break;
/* Same generation, some other thread was faster. Wait. */
lll_futex_wait (once_control, oldval, LLL_PRIVATE);
}
/* This thread is the first here. Do the initialization.
Register a cleanup handler so that in case the thread gets
interrupted the initialization can be restarted. */
pthread_cleanup_push (clear_once_control, once_control);
init_routine ();
pthread_cleanup_pop (0);
/* Say that the initialisation is done. */
*once_control = __fork_generation | 2;
/* Wake up all other threads. */
lll_futex_wake (once_control, INT_MAX, LLL_PRIVATE);
return 0;
}
weak_alias (__pthread_once, pthread_once)
hidden_def (__pthread_once)