forked from apple/darwin-xnu
-
Notifications
You must be signed in to change notification settings - Fork 0
/
aio_kern.h
111 lines (93 loc) · 3.75 KB
/
aio_kern.h
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
/*
* Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* File: sys/aio_kern.h
* Author: Jerry Cottingham [[email protected]]
*
* Header file for kernel only portion of POSIX Asynchronous IO APIs
*
*/
#include <sys/aio.h>
#ifndef _SYS_AIO_KERN_H_
#define _SYS_AIO_KERN_H_
#ifdef KERNEL
struct aio_workq_entry
{
TAILQ_ENTRY( aio_workq_entry ) aio_workq_link; /* Protected by queue lock */
TAILQ_ENTRY( aio_workq_entry ) aio_proc_link; /* Proteced by proc's aio lock */
/* Proc lock */
void *group_tag; /* identifier used to group IO requests */
/* Initialized and never changed, safe to access */
struct proc *procp; /* user proc that queued this request */
user_addr_t uaiocbp; /* pointer passed in from user land */
struct user_aiocb aiocb; /* copy of aiocb from user land */
vm_map_t aio_map; /* user land map we have a reference to */
thread_t thread; /* thread that queued this request */
/* Entry lock */
int aio_refcount;
user_ssize_t returnval; /* return value from read / write request */
int errorval; /* error value from read / write request */
int flags;
};
typedef struct aio_workq_entry aio_workq_entry;
/*
* definitions for aio_workq_entry.flags
*/
#define AIO_READ 0x00000001 /* a read */
#define AIO_WRITE 0x00000002 /* a write */
#define AIO_FSYNC 0x00000004 /* aio_fsync with op = O_SYNC */
#define AIO_DSYNC 0x00000008 /* aio_fsync with op = O_DSYNC (not supported yet) */
#define AIO_LIO 0x00000010 /* lio_listio generated IO */
#define AIO_DO_FREE 0x00000800 /* entry should be freed when last reference is dropped. */
/* set by aio_return() and _aio_exit() */
#define AIO_DISABLE 0x00002000 /* process is trying to exit or exec and we need */
/* to not try to send a signal from do_aio_completion() */
#define AIO_CLOSE_WAIT 0x00004000 /* process is trying to close and is */
/* waiting for one or more active IO requests to */
/* complete */
#define AIO_EXIT_WAIT 0x00008000 /* process is trying to exit or exec and is */
/* waiting for one or more active IO requests to */
/* complete */
#define AIO_LIO_NOTIFY 0x00010000 /* wait for list complete */
/*
* Prototypes
*/
__private_extern__ void
_aio_close(struct proc *p, int fd);
__private_extern__ void
_aio_exit(struct proc *p);
__private_extern__ void
_aio_exec(struct proc *p);
__private_extern__ void
_aio_create_worker_threads(int num);
__private_extern__ void
aio_init(void);
task_t
get_aiotask(void);
#endif /* KERNEL */
#endif /* _SYS_AIO_KERN_H_ */