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[glibc.git] / sysdeps / pthread / aio_misc.h
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1 /* Copyright (C) 1997,99,2000,01 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 02111-1307 USA. */
19 #ifndef _AIO_MISC_H
20 #define _AIO_MISC_H 1
22 #include <aio.h>
23 #include <pthread.h>
26 /* Extend the operation enum. */
27 enum
29 LIO_DSYNC = LIO_NOP + 1,
30 LIO_SYNC,
31 LIO_READ64 = LIO_READ | 128,
32 LIO_WRITE64 = LIO_WRITE | 128
36 /* Union of the two request types. */
37 typedef union
39 struct aiocb aiocb;
40 struct aiocb64 aiocb64;
41 } aiocb_union;
44 /* Used to synchronize. */
45 struct waitlist
47 struct waitlist *next;
49 pthread_cond_t *cond;
50 volatile int *counterp;
51 /* The next field is used in asynchronous `lio_listio' operations. */
52 struct sigevent *sigevp;
53 /* XXX See requestlist, it's used to work around the broken signal
54 handling in Linux. */
55 pid_t caller_pid;
59 /* Status of a request. */
60 enum
62 no,
63 queued,
64 yes,
65 allocated,
66 done
70 /* Used to queue requests.. */
71 struct requestlist
73 int running;
75 struct requestlist *last_fd;
76 struct requestlist *next_fd;
77 struct requestlist *next_prio;
78 struct requestlist *next_run;
80 /* Pointer to the actual data. */
81 aiocb_union *aiocbp;
83 /* PID of the initiator thread.
84 XXX This is only necessary for the broken signal handling on Linux. */
85 pid_t caller_pid;
87 /* List of waiting processes. */
88 struct waitlist *waiting;
92 /* Lock for global I/O list of requests. */
93 extern pthread_mutex_t __aio_requests_mutex;
96 /* Enqueue request. */
97 extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
98 int operation)
99 internal_function;
101 /* Find request entry for given AIO control block. */
102 extern struct requestlist *__aio_find_req (aiocb_union *elem)
103 internal_function;
105 /* Find request entry for given file descriptor. */
106 extern struct requestlist *__aio_find_req_fd (int fildes) internal_function;
108 /* Remove request from the list. */
109 extern void __aio_remove_request (struct requestlist *last,
110 struct requestlist *req, int all)
111 internal_function;
113 /* Release the entry for the request. */
114 extern void __aio_free_request (struct requestlist *req) internal_function;
116 /* Notify initiator of request and tell this everybody listening. */
117 extern void __aio_notify (struct requestlist *req) internal_function;
119 /* Notify initiator of request. */
120 extern int __aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
121 internal_function;
123 /* Send the signal. */
124 extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
125 internal_function;
127 #endif /* aio_misc.h */