mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-26 23:10:06 +00:00
5a3ab2fc18
2003-03-21 Ulrich Drepper <drepper@redhat.com> * cancellation.c: Adjust for new form of compare&exchange macros. * cleanup_defer.c: Likewise. * init.c: Likewise. * libc-cancellation.c: Likewise. * old_pthread_cond_broadcast.c: Likewise. * old_pthread_cond_signal.c: Likewise. * old_pthread_cond_timedwait.c: Likewise. * old_pthread_cond_wait.c: Likewise. * pthread_cancel.c: Likewise. * pthread_create.c: Likewise. * pthread_detach.c: Likewise. * pthread_join.c: Likewise. * pthread_key_delete.c: Likewise. * pthread_setcancelstate.c: Likewise. * pthread_setcanceltype.c: Likewise. * pthread_timedjoin.c: Likewise. * pthread_tryjoin.c: Likewise. * sysdeps/pthread/createthread.c: Likewise.
70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
/* Copyright (C) 2002, 2003 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_bool_acq (&self->cancelhandling,
|
|
newval, oldval))
|
|
{
|
|
if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval))
|
|
__do_cancel ();
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
strong_alias (__pthread_setcancelstate, pthread_setcancelstate)
|