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04277e02 | 1 | /* Copyright (C) 1997-2019 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
cbdee279 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
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15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
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17 | |
18 | #ifndef _AIO_MISC_H | |
19 | #define _AIO_MISC_H 1 | |
20 | ||
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21 | #include <aio.h> |
22 | #include <pthread.h> | |
23 | ||
24 | ||
25 | /* Extend the operation enum. */ | |
26 | enum | |
27 | { | |
b8744bea | 28 | LIO_DSYNC = LIO_NOP + 1, |
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29 | LIO_SYNC, |
30 | LIO_READ64 = LIO_READ | 128, | |
31 | LIO_WRITE64 = LIO_WRITE | 128 | |
32 | }; | |
33 | ||
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34 | |
35 | /* Union of the two request types. */ | |
36 | typedef union | |
37 | { | |
38 | struct aiocb aiocb; | |
39 | struct aiocb64 aiocb64; | |
40 | } aiocb_union; | |
41 | ||
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42 | |
43 | /* Used to synchronize. */ | |
44 | struct waitlist | |
45 | { | |
46 | struct waitlist *next; | |
47 | ||
9759bbf1 | 48 | /* The next two fields is used in synchronous `lio_listio' operations. */ |
679d83ba | 49 | #ifndef DONT_NEED_AIO_MISC_COND |
d71b808a | 50 | pthread_cond_t *cond; |
679d83ba | 51 | #endif |
9759bbf1 UD |
52 | int *result; |
53 | ||
86edd44f | 54 | volatile unsigned int *counterp; |
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55 | /* The next field is used in asynchronous `lio_listio' operations. */ |
56 | struct sigevent *sigevp; | |
57 | }; | |
58 | ||
59 | ||
60 | /* Status of a request. */ | |
61 | enum | |
62 | { | |
63 | no, | |
64 | queued, | |
65 | yes, | |
56ddf355 UD |
66 | allocated, |
67 | done | |
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68 | }; |
69 | ||
70 | ||
71 | /* Used to queue requests.. */ | |
72 | struct requestlist | |
73 | { | |
74 | int running; | |
75 | ||
76 | struct requestlist *last_fd; | |
77 | struct requestlist *next_fd; | |
78 | struct requestlist *next_prio; | |
79 | struct requestlist *next_run; | |
80 | ||
81 | /* Pointer to the actual data. */ | |
82 | aiocb_union *aiocbp; | |
83 | ||
84 | /* List of waiting processes. */ | |
85 | struct waitlist *waiting; | |
86 | }; | |
87 | ||
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88 | |
89 | /* Lock for global I/O list of requests. */ | |
67b78ef9 | 90 | extern pthread_mutex_t __aio_requests_mutex attribute_hidden; |
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91 | |
92 | ||
93 | /* Enqueue request. */ | |
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94 | extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp, |
95 | int operation) | |
dab0eece | 96 | attribute_hidden; |
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97 | |
98 | /* Find request entry for given AIO control block. */ | |
dab0eece | 99 | extern struct requestlist *__aio_find_req (aiocb_union *elem) attribute_hidden; |
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100 | |
101 | /* Find request entry for given file descriptor. */ | |
dab0eece | 102 | extern struct requestlist *__aio_find_req_fd (int fildes) attribute_hidden; |
d71b808a | 103 | |
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104 | /* Remove request from the list. */ |
105 | extern void __aio_remove_request (struct requestlist *last, | |
106 | struct requestlist *req, int all) | |
dab0eece | 107 | attribute_hidden; |
92806ee9 | 108 | |
d71b808a | 109 | /* Release the entry for the request. */ |
dab0eece | 110 | extern void __aio_free_request (struct requestlist *req) attribute_hidden; |
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111 | |
112 | /* Notify initiator of request and tell this everybody listening. */ | |
dab0eece | 113 | extern void __aio_notify (struct requestlist *req) attribute_hidden; |
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114 | |
115 | /* Notify initiator of request. */ | |
dab0eece | 116 | extern int __aio_notify_only (struct sigevent *sigev) attribute_hidden; |
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117 | |
118 | /* Send the signal. */ | |
3a9eb648 | 119 | extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid) |
dab0eece | 120 | attribute_hidden; |
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121 | |
122 | #endif /* aio_misc.h */ |