Update.
[glibc.git] / rt / aio_notify.c
blob54e9959bfada9b43bb0b8f0d2d08132122f93c9c
1 /* Notify initiator of AIO request.
2 Copyright (C) 1997, 1998, 1999 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 Library General Public License as
8 published by the Free Software Foundation; either version 2 of the
9 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 Library General Public License for more details.
16 You should have received a copy of the GNU Library General Public
17 License along with the GNU C Library; see the file COPYING.LIB. If not,
18 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 #include <errno.h>
22 #include <pthread.h>
23 #include <stdlib.h>
24 #include "aio_misc.h"
26 int
27 internal_function
28 __aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
30 int result = 0;
32 /* Send the signal to notify about finished processing of the request. */
33 if (sigev->sigev_notify == SIGEV_THREAD)
35 /* We have to start a thread. */
36 pthread_t tid;
37 pthread_attr_t attr, *pattr;
39 pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
40 if (pattr == NULL)
42 pthread_attr_init (&attr);
43 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
44 pattr = &attr;
47 if (pthread_create (&tid, pattr,
48 (void *(*) (void *)) sigev->sigev_notify_function,
49 sigev->sigev_value.sival_ptr) < 0)
50 result = -1;
52 else if (sigev->sigev_notify == SIGEV_SIGNAL)
53 /* We have to send a signal. */
54 if (__aio_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
55 < 0)
56 result = -1;
58 return result;
62 void
63 internal_function
64 __aio_notify (struct requestlist *req)
66 struct waitlist *waitlist;
67 struct aiocb *aiocbp = &req->aiocbp->aiocb;
69 if (__aio_notify_only (&aiocbp->aio_sigevent, req->caller_pid) != 0)
71 /* XXX What shall we do if already an error is set by
72 read/write/fsync? */
73 aiocbp->__error_code = errno;
74 aiocbp->__return_value = -1;
77 /* Now also notify possibly waiting threads. */
78 waitlist = req->waiting;
79 while (waitlist != NULL)
81 struct waitlist *next = waitlist->next;
83 /* Decrement the counter. This is used in both cases. */
84 --*waitlist->counterp;
86 if (waitlist->sigevp == NULL)
87 pthread_cond_signal (waitlist->cond);
88 else
89 /* This is part of a asynchronous `lio_listio' operation. If
90 this request is the last one, send the signal. */
91 if (*waitlist->counterp == 0)
93 __aio_notify_only (waitlist->sigevp, waitlist->caller_pid);
94 /* This is tricky. See lio_listio.c for the reason why
95 this works. */
96 free ((void *) waitlist->counterp);
99 waitlist = next;