bsd/sys/aio_kern.h

   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
  57         /* Entry lock */
  58         int             aio_refcount;
  59         user_ssize_t    returnval;      /* return value from read / write request */
  60         int             errorval;       /* error value from read / write request */
  61         int             flags;
  62 };
  63 typedef struct aio_workq_entry aio_workq_entry;
  64
  65 /*
  66  * definitions for aio_workq_entry.flags
  67  */
  68 #define AIO_READ                0x00000001      /* a read */
  69 #define AIO_WRITE               0x00000002      /* a write */
  70 #define AIO_FSYNC               0x00000004      /* aio_fsync with op = O_SYNC */
  71 #define AIO_DSYNC               0x00000008      /* aio_fsync with op = O_DSYNC (not supported yet) */
  72 #define AIO_LIO                 0x00000010      /* lio_listio generated IO */
  73 #define AIO_DO_FREE             0x00000800      /* entry should be freed when last reference is dropped. */
  74                                                 /*      set by aio_return() and _aio_exit() */
  75 #define AIO_DISABLE             0x00002000      /* process is trying to exit or exec and we need */
  76                                                 /*      to not try to send a signal from do_aio_completion() */
  77 #define AIO_CLOSE_WAIT          0x00004000      /* process is trying to close and is */
  78                                                 /*      waiting for one or more active IO requests to */
  79                                                 /*      complete */
  80 #define AIO_EXIT_WAIT           0x00008000      /* process is trying to exit or exec and is */
  81                                                 /*      waiting for one or more active IO requests to */
  82                                                 /*      complete */
  83
  84 #define AIO_LIO_NOTIFY          0x00010000      /* wait for list complete */
  85
  86 /*
  87  * Prototypes
  88  */
  89
  90 __private_extern__ void
  91 _aio_close(struct proc *p, int fd);
  92
  93 __private_extern__ void
  94 _aio_exit(struct proc *p);
  95
  96 __private_extern__ void
  97 _aio_exec(struct proc *p);
  98
  99 __private_extern__ void
 100 _aio_create_worker_threads(int num);
 101
 102 __private_extern__ void
 103 aio_init(void) __attribute__((section("__TEXT, initcode")));
 104
 105 task_t
 106 get_aiotask(void);
 107
 108 #endif /* KERNEL */
 109
 110 #endif /* _SYS_AIO_KERN_H_ */