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; /* 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}; 64typedef 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 104aio_init(void); 105 106task_t 107get_aiotask(void); 108 109#endif /* KERNEL */ 110 111#endif /* _SYS_AIO_KERN_H_ */ 112