| | 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 | |
| | 43 | struct aio_workq_entry |
| | 44 | { |
| | 45 | TAILQ_ENTRY( aio_workq_entry ) aio_workq_link; /* Protected by queue lock */ |
| | 46 | TAILQ_ENTRY( aio_workq_entry ) aio_proc_link; /* Proteced by proc's aio lock */ |
| | 47 | |
| | 48 | /* Proc lock */ |
| | 49 | void *group_tag; /* identifier used to group IO requests */ |
| | 50 | |
| | 51 | /* Initialized and never changed, safe to access */ |
| | 52 | struct proc *procp; /* user proc that queued this request */ |
| | 53 | user_addr_t uaiocbp; /* pointer passed in from user land */ |
| | 54 | struct user_aiocb aiocb; /* copy of aiocb from user land */ |
| | 55 | vm_map_t aio_map; /* user land map we have a reference to */ |
| | 56 | thread_t thread; /* thread that queued this request */ |
| | 57 | |
| | 58 | /* Entry lock */ |
| | 59 | int aio_refcount; |
| | 60 | user_ssize_t returnval; /* return value from read / write request */ |
| | 61 | int errorval; /* error value from read / write request */ |
| | 62 | int flags; |
| | 63 | }; |
| | 64 | typedef struct aio_workq_entry aio_workq_entry; |
| | 65 | |
| | 66 | /* |
| | 67 | * definitions for aio_workq_entry.flags |
| | 68 | */ |
| | 69 | #define AIO_READ 0x00000001 /* a read */ |
| | 70 | #define AIO_WRITE 0x00000002 /* a write */ |
| | 71 | #define AIO_FSYNC 0x00000004 /* aio_fsync with op = O_SYNC */ |
| | 72 | #define AIO_DSYNC 0x00000008 /* aio_fsync with op = O_DSYNC (not supported yet) */ |
| | 73 | #define AIO_LIO 0x00000010 /* lio_listio generated IO */ |
| | 74 | #define AIO_DO_FREE 0x00000800 /* entry should be freed when last reference is dropped. */ |
| | 75 | /* set by aio_return() and _aio_exit() */ |
| | 76 | #define AIO_DISABLE 0x00002000 /* process is trying to exit or exec and we need */ |
| | 77 | /* to not try to send a signal from do_aio_completion() */ |
| | 78 | #define AIO_CLOSE_WAIT 0x00004000 /* process is trying to close and is */ |
| | 79 | /* waiting for one or more active IO requests to */ |
| | 80 | /* complete */ |
| | 81 | #define AIO_EXIT_WAIT 0x00008000 /* process is trying to exit or exec and is */ |
| | 82 | /* waiting for one or more active IO requests to */ |
| | 83 | /* complete */ |
| | 84 | |
| | 85 | #define AIO_LIO_NOTIFY 0x00010000 /* wait for list complete */ |
| | 86 | |
| | 87 | /* |
| | 88 | * Prototypes |
| | 89 | */ |
| | 90 | |
| | 91 | __private_extern__ void |
| | 92 | _aio_close(struct proc *p, int fd); |
| | 93 | |
| | 94 | __private_extern__ void |
| | 95 | _aio_exit(struct proc *p); |
| | 96 | |
| | 97 | __private_extern__ void |
| | 98 | _aio_exec(struct proc *p); |
| | 99 | |
| | 100 | __private_extern__ void |
| | 101 | _aio_create_worker_threads(int num); |
| | 102 | |
| | 103 | __private_extern__ void |
| | 104 | aio_init(void); |
| | 105 | |
| | 106 | task_t |
| | 107 | get_aiotask(void); |
| | 108 | |
| | 109 | #endif /* KERNEL */ |
| | 110 | |
| | 111 | #endif /* _SYS_AIO_KERN_H_ */ |
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