Mark __libc_resp with attribute_tls_model_ie for consistency with __resp
[glibc/nacl-glibc.git] / sysdeps / pthread / aio_cancel.c
blobaa1ee443a5d8fca17cbab6a10518b08f36c6f630
1 /* Cancel requests associated with given file descriptor.
2 Copyright (C) 1997, 1998, 2000, 2002, 2005 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
22 /* We use an UGLY hack to prevent gcc from finding us cheating. The
23 implementation of aio_cancel and aio_cancel64 are identical and so
24 we want to avoid code duplication by using aliases. But gcc sees
25 the different parameter lists and prints a warning. We define here
26 a function so that aio_cancel64 has no prototype. */
27 #ifndef aio_cancel
28 #define aio_cancel64 XXX
29 #include <aio.h>
30 /* And undo the hack. */
31 #undef aio_cancel64
32 #endif
34 #include <assert.h>
35 #include <errno.h>
37 #include <aio_misc.h>
40 int
41 aio_cancel (fildes, aiocbp)
42 int fildes;
43 struct aiocb *aiocbp;
45 struct requestlist *req = NULL;
46 int result = AIO_ALLDONE;
48 /* If fildes is invalid, error. */
49 if (fcntl (fildes, F_GETFL) < 0)
51 __set_errno (EBADF);
52 return -1;
55 /* Request the mutex. */
56 pthread_mutex_lock (&__aio_requests_mutex);
58 /* We are asked to cancel a specific AIO request. */
59 if (aiocbp != NULL)
61 /* If the AIO request is not for this descriptor it has no value
62 to look for the request block. */
63 if (aiocbp->aio_fildes != fildes)
65 pthread_mutex_unlock (&__aio_requests_mutex);
66 __set_errno (EINVAL);
67 return -1;
69 else if (aiocbp->__error_code == EINPROGRESS)
71 struct requestlist *last = NULL;
73 req = __aio_find_req_fd (fildes);
75 if (req == NULL)
77 not_found:
78 pthread_mutex_unlock (&__aio_requests_mutex);
79 __set_errno (EINVAL);
80 return -1;
83 while (req->aiocbp != (aiocb_union *) aiocbp)
85 last = req;
86 req = req->next_prio;
87 if (req == NULL)
88 goto not_found;
91 /* Don't remove the entry if a thread is already working on it. */
92 if (req->running == allocated)
94 result = AIO_NOTCANCELED;
95 req = NULL;
97 else
99 /* We can remove the entry. */
100 __aio_remove_request (last, req, 0);
102 result = AIO_CANCELED;
104 req->next_prio = NULL;
108 else
110 /* Find the beginning of the list of all requests for this
111 desriptor. */
112 req = __aio_find_req_fd (fildes);
114 /* If any request is worked on by a thread it must be the first.
115 So either we can delete all requests or all but the first. */
116 if (req != NULL)
118 if (req->running == allocated)
120 struct requestlist *old = req;
121 req = req->next_prio;
122 old->next_prio = NULL;
124 result = AIO_NOTCANCELED;
126 if (req != NULL)
127 __aio_remove_request (old, req, 1);
129 else
131 result = AIO_CANCELED;
133 /* We can remove the entry. */
134 __aio_remove_request (NULL, req, 1);
139 /* Mark requests as canceled and send signal. */
140 while (req != NULL)
142 struct requestlist *old = req;
143 assert (req->running == yes || req->running == queued);
144 req->aiocbp->aiocb.__error_code = ECANCELED;
145 req->aiocbp->aiocb.__return_value = -1;
146 __aio_notify (req);
147 req = req->next_prio;
148 __aio_free_request (old);
151 /* Release the mutex. */
152 pthread_mutex_unlock (&__aio_requests_mutex);
154 return result;
157 #ifndef aio_cancel
158 weak_alias (aio_cancel, aio_cancel64)
159 #endif