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
25 /* The next two functions are similar to pthread_setcanceltype() but
26 more specialized for the use in the cancelable functions like write().
27 They do not need to check parameters etc. */
30 __pthread_enable_asynccancel (void)
32 struct pthread
*self
= THREAD_SELF
;
33 int oldval
= THREAD_GETMEM (self
, cancelhandling
);
37 int newval
= oldval
| CANCELTYPE_BITMASK
;
42 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
, newval
,
44 if (__builtin_expect (curval
== oldval
, 1))
46 if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval
))
48 THREAD_SETMEM (self
, result
, PTHREAD_CANCELED
);
55 /* Prepare the next round. */
62 /* XXX Ideally we have only one version. But this needs preparation. */
64 internal_function attribute_hidden
65 __pthread_enable_asynccancel_2 (int *oldvalp
)
67 struct pthread
*self
= THREAD_SELF
;
68 int oldval
= THREAD_GETMEM (self
, cancelhandling
);
72 int newval
= oldval
| CANCELTYPE_BITMASK
;
77 /* We have to store the value before enablying asynchronous
81 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
, newval
,
83 if (__builtin_expect (curval
== oldval
, 1))
85 if (CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS (newval
))
87 THREAD_SETMEM (self
, result
, PTHREAD_CANCELED
);
98 internal_function attribute_hidden
99 __pthread_disable_asynccancel (int oldtype
)
101 /* If asynchronous cancellation was enabled before we do not have
103 if (oldtype
& CANCELTYPE_BITMASK
)
106 struct pthread
*self
= THREAD_SELF
;
107 int oldval
= THREAD_GETMEM (self
, cancelhandling
);
111 int newval
= oldval
& ~CANCELTYPE_BITMASK
;
113 if (newval
== oldval
)
116 int curval
= THREAD_ATOMIC_CMPXCHG_VAL (self
, cancelhandling
, newval
,
118 if (__builtin_expect (curval
== oldval
, 1))
121 /* Prepare the next round. */