Update.
[glibc.git] / nptl / cleanup_defer_compat.c
bloba0ed6da88ce9feb19b9985a9cdb5a6bfaa5e6772
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
18 02111-1307 USA. */
20 #include "pthreadP.h"
23 void
24 _pthread_cleanup_push_defer (buffer, routine, arg)
25 struct _pthread_cleanup_buffer *buffer;
26 void (*routine) (void *);
27 void *arg;
29 struct pthread *self = THREAD_SELF;
31 buffer->__routine = routine;
32 buffer->__arg = arg;
33 buffer->__prev = THREAD_GETMEM (self, cleanup);
35 int cancelhandling = THREAD_GETMEM (self, cancelhandling);
37 /* Disable asynchronous cancellation for now. */
38 if (__builtin_expect (cancelhandling & CANCELTYPE_BITMASK, 0))
39 while (1)
41 int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
42 cancelhandling
43 & ~CANCELTYPE_BITMASK,
44 cancelhandling);
45 if (__builtin_expect (curval == cancelhandling, 1))
46 /* Successfully replaced the value. */
47 break;
49 /* Prepare for the next round. */
50 cancelhandling = curval;
53 buffer->__canceltype = (cancelhandling & CANCELTYPE_BITMASK
54 ? PTHREAD_CANCEL_ASYNCHRONOUS
55 : PTHREAD_CANCEL_DEFERRED);
57 THREAD_SETMEM (self, cleanup, buffer);
59 strong_alias (_pthread_cleanup_push_defer, __pthread_cleanup_push_defer)
62 void
63 _pthread_cleanup_pop_restore (buffer, execute)
64 struct _pthread_cleanup_buffer *buffer;
65 int execute;
67 struct pthread *self = THREAD_SELF;
69 THREAD_SETMEM (self, cleanup, buffer->__prev);
71 int cancelhandling;
72 if (__builtin_expect (buffer->__canceltype != PTHREAD_CANCEL_DEFERRED, 0)
73 && ((cancelhandling = THREAD_GETMEM (self, cancelhandling))
74 & CANCELTYPE_BITMASK) == 0)
76 while (1)
78 int curval = THREAD_ATOMIC_CMPXCHG_VAL (self, cancelhandling,
79 cancelhandling
80 | CANCELTYPE_BITMASK,
81 cancelhandling);
82 if (__builtin_expect (curval == cancelhandling, 1))
83 /* Successfully replaced the value. */
84 break;
86 /* Prepare for the next round. */
87 cancelhandling = curval;
90 CANCELLATION_P (self);
93 /* If necessary call the cleanup routine after we removed the
94 current cleanup block from the list. */
95 if (execute)
96 buffer->__routine (buffer->__arg);
98 strong_alias (_pthread_cleanup_pop_restore, __pthread_cleanup_pop_restore)