1 | /* Copyright (C) 1997-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ |
17 | |
18 | #ifndef _AIO_MISC_H |
19 | #define _AIO_MISC_H 1 |
20 | |
21 | #include <aio.h> |
22 | #include <pthread.h> |
23 | |
24 | |
25 | /* Extend the operation enum. */ |
26 | enum |
27 | { |
28 | LIO_DSYNC = LIO_NOP + 1, |
29 | LIO_SYNC, |
30 | LIO_READ64 = LIO_READ | 128, |
31 | LIO_WRITE64 = LIO_WRITE | 128 |
32 | }; |
33 | |
34 | |
35 | /* Union of the two request types. */ |
36 | typedef union |
37 | { |
38 | struct aiocb aiocb; |
39 | struct aiocb64 aiocb64; |
40 | } aiocb_union; |
41 | |
42 | |
43 | /* Used to synchronize. */ |
44 | struct waitlist |
45 | { |
46 | struct waitlist *next; |
47 | |
48 | /* The next two fields is used in synchronous `lio_listio' operations. */ |
49 | #ifndef DONT_NEED_AIO_MISC_COND |
50 | pthread_cond_t *cond; |
51 | #endif |
52 | int *result; |
53 | |
54 | volatile unsigned int *counterp; |
55 | /* The next field is used in asynchronous `lio_listio' operations. */ |
56 | struct sigevent *sigevp; |
57 | #ifdef BROKEN_THREAD_SIGNALS |
58 | /* XXX See requestlist, it's used to work around the broken signal |
59 | handling in Linux. */ |
60 | pid_t caller_pid; |
61 | #endif |
62 | }; |
63 | |
64 | |
65 | /* Status of a request. */ |
66 | enum |
67 | { |
68 | no, |
69 | queued, |
70 | yes, |
71 | allocated, |
72 | done |
73 | }; |
74 | |
75 | |
76 | /* Used to queue requests.. */ |
77 | struct requestlist |
78 | { |
79 | int running; |
80 | |
81 | struct requestlist *last_fd; |
82 | struct requestlist *next_fd; |
83 | struct requestlist *next_prio; |
84 | struct requestlist *next_run; |
85 | |
86 | /* Pointer to the actual data. */ |
87 | aiocb_union *aiocbp; |
88 | |
89 | #ifdef BROKEN_THREAD_SIGNALS |
90 | /* PID of the initiator thread. |
91 | XXX This is only necessary for the broken signal handling on Linux. */ |
92 | pid_t caller_pid; |
93 | #endif |
94 | |
95 | /* List of waiting processes. */ |
96 | struct waitlist *waiting; |
97 | }; |
98 | |
99 | |
100 | /* Lock for global I/O list of requests. */ |
101 | extern pthread_mutex_t __aio_requests_mutex attribute_hidden; |
102 | |
103 | |
104 | /* Enqueue request. */ |
105 | extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp, |
106 | int operation) |
107 | attribute_hidden internal_function; |
108 | |
109 | /* Find request entry for given AIO control block. */ |
110 | extern struct requestlist *__aio_find_req (aiocb_union *elem) |
111 | attribute_hidden internal_function; |
112 | |
113 | /* Find request entry for given file descriptor. */ |
114 | extern struct requestlist *__aio_find_req_fd (int fildes) |
115 | attribute_hidden internal_function; |
116 | |
117 | /* Remove request from the list. */ |
118 | extern void __aio_remove_request (struct requestlist *last, |
119 | struct requestlist *req, int all) |
120 | attribute_hidden internal_function; |
121 | |
122 | /* Release the entry for the request. */ |
123 | extern void __aio_free_request (struct requestlist *req) |
124 | attribute_hidden internal_function; |
125 | |
126 | /* Notify initiator of request and tell this everybody listening. */ |
127 | extern void __aio_notify (struct requestlist *req) |
128 | attribute_hidden internal_function; |
129 | |
130 | /* Notify initiator of request. */ |
131 | #ifdef BROKEN_THREAD_SIGNALS |
132 | extern int __aio_notify_only (struct sigevent *sigev, pid_t caller_pid) |
133 | attribute_hidden internal_function; |
134 | #else |
135 | extern int __aio_notify_only (struct sigevent *sigev) |
136 | attribute_hidden internal_function; |
137 | #endif |
138 | |
139 | /* Send the signal. */ |
140 | extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid) |
141 | attribute_hidden internal_function; |
142 | |
143 | #endif /* aio_misc.h */ |
144 | |