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glibc/nptl/pthread_setcancelstate.c
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/* Copyright (C) 2002-2016 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, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <errno.h> | |
#include "pthreadP.h" | |
#include <atomic.h> | |
int | |
__pthread_setcancelstate (int state, int *oldstate) | |
{ | |
volatile struct pthread *self; | |
if (state < PTHREAD_CANCEL_ENABLE || state > PTHREAD_CANCEL_DISABLE) | |
return EINVAL; | |
self = THREAD_SELF; | |
int oldval = THREAD_GETMEM (self, cancelhandling); | |
while (1) | |
{ | |
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. */ | |
int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling, newval, | |
oldval); | |
if (__glibc_likely (curval == oldval)) | |
{ | |
if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval)) | |
__do_cancel (); | |
break; | |
} | |
/* Prepare for the next round. */ | |
oldval = curval; | |
} | |
return 0; | |
} | |
strong_alias (__pthread_setcancelstate, pthread_setcancelstate) | |
hidden_def (__pthread_setcancelstate) |