1 /* Copyright (C) 2001 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2001.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
29 /* We need this special structure to handle asynchronous I/O. */
33 struct sigevent sigev;
34 struct waitlist list[0];
39 getaddrinfo_a (int mode, struct gaicb *list[], int ent, struct sigevent *sig)
41 struct sigevent defsigev;
42 struct requestlist *requests[ent];
44 volatile int total = 0;
47 /* Check arguments. */
48 if (mode != GAI_WAIT && mode != GAI_NOWAIT)
56 defsigev.sigev_notify = SIGEV_NONE;
60 /* Request the mutex. */
61 pthread_mutex_lock (&__gai_requests_mutex);
63 /* Now we can enqueue all requests. Since we already acquired the
64 mutex the enqueue function need not do this. */
65 for (cnt = 0; cnt < ent; ++cnt)
66 if (list[cnt] != NULL)
68 requests[cnt] = __gai_enqueue_request (list[cnt]);
70 if (requests[cnt] != NULL)
71 /* Successfully enqueued. */
74 /* Signal that we've seen an error. `errno' and the error code
75 of the gaicb will tell more. */
83 /* We don't have anything to do except signalling if we work
86 /* Release the mutex. We do this before raising a signal since the
87 signal handler might do a `siglongjmp' and then the mutex is
89 pthread_mutex_unlock (&__gai_requests_mutex);
91 if (mode == GAI_NOWAIT)
92 __gai_notify_only (sig,
93 sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0);
97 else if (mode == GAI_WAIT)
99 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
100 struct waitlist waitlist[ent];
104 for (cnt = 0; cnt < ent; ++cnt)
105 if (requests[cnt] != NULL)
107 waitlist[cnt].cond = &cond;
108 waitlist[cnt].next = requests[cnt]->waiting;
109 waitlist[cnt].counterp = &total;
110 waitlist[cnt].sigevp = NULL;
111 waitlist[cnt].caller_pid = 0; /* Not needed. */
112 requests[cnt]->waiting = &waitlist[cnt];
116 /* Since `pthread_cond_wait'/`pthread_cond_timedwait' are cancelation
117 points we must be careful. We added entries to the waiting lists
118 which we must remove. So defer cancelation for now. */
119 pthread_setcancelstate (PTHREAD_CANCEL_DISABLE, &oldstate);
122 pthread_cond_wait (&cond, &__gai_requests_mutex);
124 /* Now it's time to restore the cancelation state. */
125 pthread_setcancelstate (oldstate, NULL);
127 /* Release the conditional variable. */
128 if (pthread_cond_destroy (&cond) != 0)
129 /* This must never happen. */
134 struct async_waitlist *waitlist;
136 waitlist = (struct async_waitlist *)
137 malloc (sizeof (struct async_waitlist)
138 + (ent * sizeof (struct waitlist)));
140 if (waitlist == NULL)
144 pid_t caller_pid = sig->sigev_notify == SIGEV_SIGNAL ? getpid () : 0;
147 for (cnt = 0; cnt < ent; ++cnt)
148 if (requests[cnt] != NULL)
150 waitlist->list[cnt].cond = NULL;
151 waitlist->list[cnt].next = requests[cnt]->waiting;
152 waitlist->list[cnt].counterp = &waitlist->counter;
153 waitlist->list[cnt].sigevp = &waitlist->sigev;
154 waitlist->list[cnt].caller_pid = caller_pid;
155 requests[cnt]->waiting = &waitlist->list[cnt];
159 waitlist->counter = total;
160 waitlist->sigev = *sig;
164 /* Release the mutex. */
165 pthread_mutex_unlock (&__gai_requests_mutex);