1 /* Copyright (C) 2001, 2006 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 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
28 void (*func) (sigval_t);
33 notify_func_wrapper (void *arg)
35 gai_start_notify_thread ();
36 struct notify_func *const n = arg;
37 void (*func) (sigval_t) = n->func;
38 sigval_t value = n->value;
47 __gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
51 /* Send the signal to notify about finished processing of the request. */
52 if (sigev->sigev_notify == SIGEV_THREAD)
54 /* We have to start a thread. */
56 pthread_attr_t attr, *pattr;
58 pattr = (pthread_attr_t *) sigev->sigev_notify_attributes;
61 pthread_attr_init (&attr);
62 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
66 /* SIGEV may be freed as soon as we return, so we cannot let the
67 notification thread use that pointer. Even though a sigval_t is
68 only one word and the same size as a void *, we cannot just pass
69 the value through pthread_create as the argument and have the new
70 thread run the user's function directly, because on some machines
71 the calling convention for a union like sigval_t is different from
72 that for a pointer type like void *. */
73 struct notify_func *nf = malloc (sizeof *nf);
78 nf->func = sigev->sigev_notify_function;
79 nf->value = sigev->sigev_value;
80 if (pthread_create (&tid, pattr, notify_func_wrapper, nf) < 0)
87 else if (sigev->sigev_notify == SIGEV_SIGNAL)
88 /* We have to send a signal. */
89 if (__gai_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid)
99 __gai_notify (struct requestlist *req)
101 struct waitlist *waitlist;
103 /* Now also notify possibly waiting threads. */
104 waitlist = req->waiting;
105 while (waitlist != NULL)
107 struct waitlist *next = waitlist->next;
109 if (waitlist->sigevp == NULL)
111 #ifdef DONT_NEED_GAI_MISC_COND
112 GAI_MISC_NOTIFY (waitlist);
114 /* Decrement the counter. */
115 --*waitlist->counterp;
117 pthread_cond_signal (waitlist->cond);
121 /* This is part of a asynchronous `getaddrinfo_a' operation. If
122 this request is the last one, send the signal. */
123 if (--*waitlist->counterp == 0)
125 __gai_notify_only (waitlist->sigevp, waitlist->caller_pid);
126 /* This is tricky. See getaddrinfo_a.c for the reason why
128 free ((void *) waitlist->counterp);