osfmk/kern/task_swap.h

   1 /*
   2  * Copyright (c) 2000 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  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * HISTORY
  33  *
  34  * Revision 1.1.1.1  1998/09/22 21:05:32  wsanchez
  35  * Import of Mac OS X kernel (~semeria)
  36  *
  37  * Revision 1.1.1.1  1998/03/07 02:25:56  wsanchez
  38  * Import of OSF Mach kernel (~mburg)
  39  *
  40  * Revision 1.1.4.1  1995/04/07  19:02:38  barbou
  41  *      Merged into mainline.
  42  *      [95/03/09            barbou]
  43  *
  44  * Revision 1.1.2.2  1995/02/13  15:35:45  barbou
  45  *      Merged/ported to MK6.
  46  *
  47  * Revision 1.1.1.3  94/08/12  15:44:39  barbou
  48  *      VM Merge - Task Swapper.
  49  *
  50  *      Changed host_priv_t into host_t.
  51  *      [94/07/28            barbou]
  52  *
  53  * Revision 1.1.1.2  1994/07/28  15:33:46  barbou
  54  *      Copied from IK.
  55  *
  56  * Revision 3.0.3.2  1994/01/20  19:53:01  chasb
  57  *      Remove excessively restrictive copyright notice
  58  *      [1994/01/20  17:50:40  chasb]
  59  *
  60  * Revision 3.0.3.1  1993/12/20  21:06:49  gupta
  61  *      Expanded C O P Y R I G H T
  62  *      [1993/12/17  22:19:22  gupta]
  63  *
  64  * Revision 3.0  1992/12/31  22:08:24  ede
  65  *      Initial revision for OSF/1 R1.3
  66  *
  67  * Revision 1.1.4.5  1992/03/16  18:02:52  gmf
  68  *      Add TASK_SW_ELIGIBLE flag to swap_flags; prototype
  69  *      task_swapout_eligible, task_swapout_ineligible.
  70  *      [1992/02/12  22:01:48  gmf]
  71  *
  72  * Revision 1.1.4.4  1992/01/22  22:14:13  gmf
  73  *      Change prototype for task_swappable() to use host_priv_t
  74  *      instead of host_t.
  75  *      [1992/01/17  17:48:13  gmf]
  76  *
  77  * Revision 1.1.4.3  1991/12/10  17:20:55  gmf
  78  *      Add extern declaration for new thread.
  79  *      Changed TASK_SW_WAIT flag to TASK_SW_WANT_IN.
  80  *      [1991/12/10  16:19:10  gmf]
  81  *
  82  * Revision 1.1.4.2  1991/11/21  21:48:35  mmp
  83  *      initial task swapping code
  84  *      [1991/11/21  21:01:37  mmp]
  85  *
  86  * $EndLog$
  87  */
  88
  89 /*
  90  *              File:   kern/task_swap.h
  91  *
  92  *      Task residency management primitives declarations.
  93  */
  94
  95 #ifndef _KERN_TASK_SWAP_H_
  96 #define _KERN_TASK_SWAP_H_
  97
  98 #include <kern/host.h>
  99
 100 /*
 101  *      swap states
 102  */
 103 #define TASK_SW_UNSWAPPABLE     1       /* not swappable */
 104 #define TASK_SW_IN              2       /* swapped in (resident) */
 105 #define TASK_SW_OUT             3       /* swapped out (non-resident) */
 106 #define TASK_SW_COMING_IN       4       /* about to be swapped in */
 107 #define TASK_SW_GOING_OUT       5       /* being swapped out */
 108
 109 /*
 110  *      swap flags
 111  */
 112 #define TASK_SW_MAKE_UNSWAPPABLE        0x01    /* make it unswappable */
 113 #define TASK_SW_WANT_IN                 0x02    /* sleeping on state */
 114 #define TASK_SW_ELIGIBLE                0x04    /* eligible for swapping */
 115
 116 /*
 117  * exported routines
 118  */
 119 extern void task_swapper_init(void);
 120 extern kern_return_t task_swapin(
 121         task_t,                                 /* task */
 122         boolean_t);                             /* make_unswappable */
 123 extern kern_return_t task_swapout(task_t /* task */);
 124 extern void task_swapper(void);
 125 extern void task_swap_swapout_thread(void);
 126 extern void compute_vm_averages(void);
 127 extern kern_return_t task_swappable(
 128         host_priv_t,                            /* host */
 129         task_t,                                 /* task */
 130         boolean_t);                             /* swappable */
 131 extern void task_swapout_eligible(task_t /* task */);
 132 extern void task_swapout_ineligible(task_t /* task */);
 133 extern void swapout_ast(void);
 134
 135 #endif  /* _KERN_TASK_SWAP_H_ */