1 /* Copyright (C) 2002 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
29 volatile struct pthread
*pd
= (volatile struct pthread
*) th
;
33 int oldval
= pd
->cancelhandling
;
34 int newval
= oldval
| CANCELED_BITMASK
;
36 /* Avoid doing unnecessary work. The atomic operation can
37 potentially be expensive if the bug has to be locked and
38 remote cache lines have to be invalidated. */
42 /* If the cancellation is handled asynchronously just send a
43 signal. We avoid this if possible since it's more
45 if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval
))
47 /* The cancellation handler will take care of marking the
48 thread as canceled. */
49 __pthread_kill (th
, SIGCANCEL
);
54 /* Mark the thread as canceled. This has to be done
55 atomically since other bits could be modified as well. */
56 if (atomic_compare_and_exchange_acq (&pd
->cancelhandling
, newval
,