osfmk/kern/task_swap.c

   1 /*
   2  * Copyright (c) 2000-2004 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  *              File:   kern/task_swap.c
  33  *
  34  *      Task residency management primitives implementation.
  35  */
  36 #include <mach_assert.h>
  37 #include <task_swapper.h>
  38
  39 #include <kern/spl.h>
  40 #include <kern/lock.h>
  41 #include <kern/queue.h>
  42 #include <kern/host.h>
  43 #include <kern/task.h>
  44 #include <kern/task_swap.h>
  45 #include <kern/thread.h>
  46 #include <kern/host_statistics.h>
  47 #include <kern/misc_protos.h>
  48 #include <kern/assert.h>
  49 #include <mach/policy.h>
  50
  51 #include <ipc/ipc_port.h>       /* We use something from in here */
  52
  53 /*
  54  *      task_swappable: [exported]
  55  *
  56  *      Make a task swappable or non-swappable. If made non-swappable,
  57  *      it will be swapped in.
  58  */
  59 kern_return_t
  60 task_swappable(
  61         host_priv_t host_priv,
  62         task_t task,
  63         __unused boolean_t make_swappable)
  64 {
  65         if (host_priv == HOST_PRIV_NULL)
  66                 return (KERN_INVALID_ARGUMENT);
  67
  68         if (task == TASK_NULL)
  69                 return (KERN_INVALID_ARGUMENT);
  70
  71         /*
  72          * We don't support swapping, this call is purely advisory.
  73          */
  74         return (KERN_SUCCESS);
  75 }