1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/* Copyright (C) 1997,99,2000,01 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _AIO_MISC_H
#define _AIO_MISC_H 1
#include <aio.h>
#include <pthread.h>
/* Extend the operation enum. */
enum
{
LIO_DSYNC = LIO_NOP + 1,
LIO_SYNC,
LIO_READ64 = LIO_READ | 128,
LIO_WRITE64 = LIO_WRITE | 128
};
/* Union of the two request types. */
typedef union
{
struct aiocb aiocb;
struct aiocb64 aiocb64;
} aiocb_union;
/* Used to synchronize. */
struct waitlist
{
struct waitlist *next;
pthread_cond_t *cond;
volatile int *counterp;
/* The next field is used in asynchronous `lio_listio' operations. */
struct sigevent *sigevp;
/* XXX See requestlist, it's used to work around the broken signal
handling in Linux. */
pid_t caller_pid;
};
/* Status of a request. */
enum
{
no,
queued,
yes,
allocated,
done
};
/* Used to queue requests.. */
struct requestlist
{
int running;
struct requestlist *last_fd;
struct requestlist *next_fd;
struct requestlist *next_prio;
struct requestlist *next_run;
/* Pointer to the actual data. */
aiocb_union *aiocbp;
/* PID of the initiator thread.
XXX This is only necessary for the broken signal handling on Linux. */
pid_t caller_pid;
/* List of waiting processes. */
struct waitlist *waiting;
};
/* Lock for global I/O list of requests. */
extern pthread_mutex_t __aio_requests_mutex;
/* Enqueue request. */
extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
int operation)
internal_function;
/* Find request entry for given AIO control block. */
extern struct requestlist *__aio_find_req (aiocb_union *elem)
internal_function;
/* Find request entry for given file descriptor. */
extern struct requestlist *__aio_find_req_fd (int fildes) internal_function;
/* Remove request from the list. */
extern void __aio_remove_request (struct requestlist *last,
struct requestlist *req, int all)
internal_function;
/* Release the entry for the request. */
extern void __aio_free_request (struct requestlist *req) internal_function;
/* Notify initiator of request and tell this everybody listening. */
extern void __aio_notify (struct requestlist *req) internal_function;
/* Notify initiator of request. */
extern int __aio_notify_only (struct sigevent *sigev, pid_t caller_pid)
internal_function;
/* Send the signal. */
extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
internal_function;
#endif /* aio_misc.h */
|
