1 /* Copyright (C) 2002, 2003 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
28 /* The next two functions are similar to pthread_setcanceltype() but
29 more specialized for the use in the cancelable functions like write().
30 They do not need to check parameters etc. */
33 __libc_enable_asynccancel (void)
35 struct pthread
*self
= THREAD_SELF
;
36 int oldval
= THREAD_GETMEM (self
, cancelhandling
);
40 int newval
= oldval
| CANCELTYPE_BITMASK
;
42 if (__builtin_expect ((oldval
& CANCELED_BITMASK
) != 0, 0))
44 /* If we are already exiting stop right here. */
45 if ((oldval
& EXITING_BITMASK
) != 0)
48 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
,
50 if (__builtin_expect (curval
!= oldval
, 0))
52 /* Somebody else modified the word, try again. */
57 THREAD_SETMEM (self
, result
, PTHREAD_CANCELED
);
64 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
, newval
,
66 if (__builtin_expect (curval
== oldval
, 1))
69 /* Prepare the next round. */
78 internal_function attribute_hidden
79 __libc_disable_asynccancel (int oldtype
)
81 /* If asynchronous cancellation was enabled before we do not have
83 if (oldtype
& CANCELTYPE_BITMASK
)
86 struct pthread
*self
= THREAD_SELF
;
87 int oldval
= THREAD_GETMEM (self
, cancelhandling
);
91 int newval
= oldval
& ~CANCELTYPE_BITMASK
;
96 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
, newval
,
98 if (__builtin_expect (curval
== oldval
, 1))
101 /* Prepare the next round. */