1/*
2 * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 *	File:	sys/aio_kern.h
30 *	Author:	Jerry Cottingham [jerryc@apple.com]
31 *
32 *	Header file for kernel only portion of POSIX Asynchronous IO APIs
33 *
34 */
35
36#include <sys/aio.h>
37
38#ifndef _SYS_AIO_KERN_H_
39#define	_SYS_AIO_KERN_H_
40
41#ifdef KERNEL
42
43struct aio_workq_entry
44{
45	TAILQ_ENTRY( aio_workq_entry )	aio_workq_link;
46	struct proc						*procp;		/* user proc that queued this request */
47	user_addr_t						uaiocbp;  	/* pointer passed in from user land */
48	user_addr_t						fsyncp;		/* not NULL means this request must complete */
49												/* before an aio_fsync call can proceed. */
50	vm_map_t						aio_map;	/* user land map we have a reference to */
51	user_ssize_t					returnval;	/* return value from read / write request */
52	int								errorval;	/* error value from read / write request */
53	int								flags;
54	long							group_tag;	/* identifier used to group IO requests */
55	struct user_aiocb				aiocb;		/* copy of aiocb from user land */
56};
57typedef struct aio_workq_entry aio_workq_entry;
58
59/*
60 * definitions for aio_workq_entry.flags
61 */
62#define	AIO_READ		0x00000001
63#define	AIO_WRITE		0x00000002
64#define	AIO_FSYNC		0x00000004	/* aio_fsync with op = O_SYNC */
65#define	AIO_DSYNC		0x00000008	/* aio_fsync with op = O_DSYNC (not supported yet) */
66#define	AIO_LIO			0x00000010	/* lio_listio generated IO */
67#define	AIO_DO_FREE		0x00000800	/* entry needs to be freed */
68#define	AIO_COMPLETION	0x00001000	/* entry is in completion processing (not freeable yet) */
69#define	AIO_DISABLE		0x00002000	/* process is trying to exit or exec and we need */
70									/* 	to disable normal completion notification */
71#define	AIO_WAITING		0x00004000	/* process is trying to exit, exec, or close and is */
72									/* 	waiting for one or more active IO requests to */
73									/*	complete */
74
75/*
76 * Prototypes
77 */
78
79__private_extern__ void
80_aio_close(struct proc *p, int fd);
81
82__private_extern__ void
83_aio_exit(struct proc *p);
84
85__private_extern__ void
86_aio_exec(struct proc *p);
87
88__private_extern__ void
89_aio_create_worker_threads(int num);
90
91__private_extern__ void
92aio_init(void) __attribute__((section("__TEXT, initcode")));
93
94task_t
95get_aiotask(void);
96
97#endif /* KERNEL */
98
99#endif /* _SYS_AIO_KERN_H_ */
100