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a334319f | 1 | /* Copyright (C) 2001 Free Software Foundation, Inc. |
2ace5721 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2001. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
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9 | |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
2ace5721 | 14 | |
41bdb6e2 AJ |
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. */ | |
2ace5721 UD |
19 | |
20 | #include <netdb.h> | |
21 | #include <pthread.h> | |
22 | #include <stdlib.h> | |
23 | ||
a334319f | 24 | #include "gai_misc.h" |
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25 | |
26 | ||
27 | static void * | |
28 | notify_func_wrapper (void *arg) | |
29 | { | |
a334319f UD |
30 | struct sigevent *sigev = arg; |
31 | sigev->sigev_notify_function (sigev->sigev_value); | |
2ace5721 UD |
32 | return NULL; |
33 | } | |
34 | ||
35 | ||
36 | int | |
37 | internal_function | |
38 | __gai_notify_only (struct sigevent *sigev, pid_t caller_pid) | |
39 | { | |
40 | int result = 0; | |
41 | ||
42 | /* Send the signal to notify about finished processing of the request. */ | |
43 | if (sigev->sigev_notify == SIGEV_THREAD) | |
44 | { | |
45 | /* We have to start a thread. */ | |
46 | pthread_t tid; | |
47 | pthread_attr_t attr, *pattr; | |
48 | ||
49 | pattr = (pthread_attr_t *) sigev->sigev_notify_attributes; | |
50 | if (pattr == NULL) | |
51 | { | |
52 | pthread_attr_init (&attr); | |
53 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); | |
54 | pattr = &attr; | |
55 | } | |
56 | ||
a334319f | 57 | if (pthread_create (&tid, pattr, notify_func_wrapper, sigev) < 0) |
2ace5721 UD |
58 | result = -1; |
59 | } | |
60 | else if (sigev->sigev_notify == SIGEV_SIGNAL) | |
61 | /* We have to send a signal. */ | |
62 | if (__gai_sigqueue (sigev->sigev_signo, sigev->sigev_value, caller_pid) | |
63 | < 0) | |
64 | result = -1; | |
65 | ||
66 | return result; | |
67 | } | |
68 | ||
69 | ||
70 | void | |
71 | internal_function | |
72 | __gai_notify (struct requestlist *req) | |
73 | { | |
74 | struct waitlist *waitlist; | |
75 | ||
76 | /* Now also notify possibly waiting threads. */ | |
77 | waitlist = req->waiting; | |
78 | while (waitlist != NULL) | |
79 | { | |
80 | struct waitlist *next = waitlist->next; | |
81 | ||
a334319f UD |
82 | /* Decrement the counter. This is used in both cases. */ |
83 | --*waitlist->counterp; | |
84 | ||
2ace5721 | 85 | if (waitlist->sigevp == NULL) |
a334319f | 86 | pthread_cond_signal (waitlist->cond); |
2ace5721 UD |
87 | else |
88 | /* This is part of a asynchronous `getaddrinfo_a' operation. If | |
89 | this request is the last one, send the signal. */ | |
a334319f | 90 | if (*waitlist->counterp == 0) |
2ace5721 UD |
91 | { |
92 | __gai_notify_only (waitlist->sigevp, waitlist->caller_pid); | |
93 | /* This is tricky. See getaddrinfo_a.c for the reason why | |
94 | this works. */ | |
95 | free ((void *) waitlist->counterp); | |
96 | } | |
97 | ||
98 | waitlist = next; | |
99 | } | |
100 | } |