mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
9ae0909b35
2002-12-13 Ulrich Drepper <drepper@redhat.com> * misc/syslog.c (log_cleanup): Don't use parameter in __libc_lock_unlock call, use syslog_lock directly. Adjust callers to pass NULL instead of a pointer to syslog_lock.
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* Copyright (C) 2002 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
|
|
|
|
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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <errno.h>
|
|
#include "pthreadP.h"
|
|
#include <atomic.h>
|
|
|
|
|
|
int
|
|
pthread_setcancelstate (state, oldstate)
|
|
int state;
|
|
int *oldstate;
|
|
{
|
|
volatile struct pthread *self;
|
|
|
|
if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE)
|
|
return EINVAL;
|
|
|
|
self = THREAD_SELF;
|
|
|
|
while (1)
|
|
{
|
|
int oldval = THREAD_GETMEM (self, cancelhandling);
|
|
int newval = (state == PTHREAD_CANCEL_DISABLE
|
|
? oldval | CANCELSTATE_BITMASK
|
|
: oldval & ~CANCELSTATE_BITMASK);
|
|
|
|
/* Store the old value. */
|
|
if (oldstate != NULL)
|
|
*oldstate = ((oldval & CANCELSTATE_BITMASK)
|
|
? PTHREAD_CANCEL_DISABLE : PTHREAD_CANCEL_ENABLE);
|
|
|
|
/* Avoid doing unnecessary work. The atomic operation can
|
|
potentially be expensive if the memory has to be locked and
|
|
remote cache lines have to be invalidated. */
|
|
if (oldval == newval)
|
|
break;
|
|
|
|
/* Update the cancel handling word. This has to be done
|
|
atomically since other bits could be modified as well. */
|
|
if (atomic_compare_and_exchange_acq (&self->cancelhandling, newval,
|
|
oldval) == 0)
|
|
{
|
|
if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval))
|
|
__do_cancel ();
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|