1/* Copyright (C) 2001-2020 Free Software Foundation, Inc.
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
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.
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
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _GAI_MISC_H
20#define _GAI_MISC_H 1
21
22#include <netdb.h>
23#include <signal.h>
24
25
26/* Used to synchronize. */
27struct waitlist
28 {
29 struct waitlist *next;
30
31#ifndef DONT_NEED_GAI_MISC_COND
32 pthread_cond_t *cond;
33#endif
34 volatile unsigned int *counterp;
35 /* The next field is used in asynchronous `lio_listio' operations. */
36 struct sigevent *sigevp;
37 /* XXX See requestlist, it's used to work around the broken signal
38 handling in Linux. */
39 pid_t caller_pid;
40 };
41
42
43/* Used to queue requests.. */
44struct requestlist
45 {
46 int running;
47
48 struct requestlist *next;
49
50 /* Pointer to the actual data. */
51 struct gaicb *gaicbp;
52
53 /* List of waiting processes. */
54 struct waitlist *waiting;
55 };
56
57/* To customize the implementation one can use the following struct.
58 This implementation follows the one in Irix. */
59struct gaiinit
60 {
61 int gai_threads; /* Maximal number of threads. */
62 int gai_num; /* Number of expected simultanious requests. */
63 int gai_locks; /* Not used. */
64 int gai_usedba; /* Not used. */
65 int gai_debug; /* Not used. */
66 int gai_numusers; /* Not used. */
67 int gai_idle_time; /* Number of seconds before idle thread
68 terminates. */
69 int gai_reserved;
70 };
71
72
73/* Lock for global I/O list of requests. */
74extern pthread_mutex_t __gai_requests_mutex;
75
76
77/* Enqueue request. */
78extern struct requestlist *__gai_enqueue_request (struct gaicb *gaicbp)
79 attribute_hidden;
80
81/* Find request on wait list. */
82extern struct requestlist *__gai_find_request (const struct gaicb *gaicbp)
83 attribute_hidden;
84
85/* Remove request from waitlist. */
86extern int __gai_remove_request (struct gaicb *gaicbp)
87 attribute_hidden;
88
89/* Notify initiator of request and tell this everybody listening. */
90extern void __gai_notify (struct requestlist *req)
91 attribute_hidden;
92
93/* Notify initiator of request. */
94extern int __gai_notify_only (struct sigevent *sigev, pid_t caller_pid)
95 attribute_hidden;
96
97/* Send the signal. */
98extern int __gai_sigqueue (int sig, const union sigval val, pid_t caller_pid);
99
100#endif /* gai_misc.h */
101