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/>. */
23 _pthread_cleanup_push_defer (buffer, routine, arg)
24 struct _pthread_cleanup_buffer *buffer;
25 void (*routine) (void *);
28 struct pthread *self = THREAD_SELF;
30 buffer->__routine = routine;
32 buffer->__prev = THREAD_GETMEM (self, cleanup);
34 int cancelhandling = THREAD_GETMEM (self, cancelhandling);
36 /* Disable asynchronous cancellation for now. */
37 if (__glibc_unlikely (cancelhandling & CANCELTYPE_BITMASK))
40 int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
42 & ~CANCELTYPE_BITMASK,
44 if (__glibc_likely (curval == cancelhandling))
45 /* Successfully replaced the value. */
48 /* Prepare for the next round. */
49 cancelhandling = curval;
52 buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK
53 ? PTHREAD_CANCEL_ASYNCHRONOUS
54 : PTHREAD_CANCEL_DEFERRED);
56 THREAD_SETMEM (self, cleanup, buffer);
58 strong_alias (_pthread_cleanup_push_defer, __pthread_cleanup_push_defer)
62 _pthread_cleanup_pop_restore (buffer, execute)
63 struct _pthread_cleanup_buffer *buffer;
66 struct pthread *self = THREAD_SELF;
68 THREAD_SETMEM (self, cleanup, buffer->__prev);
71 if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0)
72 && ((cancelhandling = THREAD_GETMEM (self, cancelhandling))
73 & CANCELTYPE_BITMASK) == 0)
77 int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
81 if (__glibc_likely (curval == cancelhandling))
82 /* Successfully replaced the value. */
85 /* Prepare for the next round. */
86 cancelhandling = curval;
89 CANCELLATION_P (self);
92 /* If necessary call the cleanup routine after we removed the
93 current cleanup block from the list. */
95 buffer->__routine (buffer->__arg);
97 strong_alias (_pthread_cleanup_pop_restore, __pthread_cleanup_pop_restore)