1 /* Copyright (C) 2002-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
25 __pthread_setcanceltype (type
, oldtype
)
29 if (type
< PTHREAD_CANCEL_DEFERRED
|| type
> PTHREAD_CANCEL_ASYNCHRONOUS
)
33 if (type
== PTHREAD_CANCEL_ASYNCHRONOUS
)
37 volatile struct pthread
*self
= THREAD_SELF
;
39 int oldval
= THREAD_GETMEM (self
, cancelhandling
);
42 int newval
= (type
== PTHREAD_CANCEL_ASYNCHRONOUS
43 ? oldval
| CANCELTYPE_BITMASK
44 : oldval
& ~CANCELTYPE_BITMASK
);
46 /* Store the old value. */
48 *oldtype
= ((oldval
& CANCELTYPE_BITMASK
)
49 ? PTHREAD_CANCEL_ASYNCHRONOUS
: PTHREAD_CANCEL_DEFERRED
);
51 /* Avoid doing unnecessary work. The atomic operation can
52 potentially be expensive if the memory has to be locked and
53 remote cache lines have to be invalidated. */
57 /* Update the cancel handling word. This has to be done
58 atomically since other bits could be modified as well. */
59 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
, newval
,
61 if (__glibc_likely (curval
== oldval
))
63 if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval
))
65 THREAD_SETMEM (self
, result
, PTHREAD_CANCELED
);
72 /* Prepare for the next round. */
78 strong_alias (__pthread_setcanceltype
, pthread_setcanceltype
)