osfmk/kern/task_swap.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  *              File:   kern/task_swap.c
  27  *
  28  *      Task residency management primitives implementation.
  29  */
  30 #include <mach_assert.h>
  31 #include <task_swapper.h>
  32
  33 #include <kern/spl.h>
  34 #include <kern/lock.h>
  35 #include <kern/queue.h>
  36 #include <kern/host.h>
  37 #include <kern/task.h>
  38 #include <kern/task_swap.h>
  39 #include <kern/thread.h>
  40 #include <kern/host_statistics.h>
  41 #include <kern/misc_protos.h>
  42 #include <kern/assert.h>
  43 #include <mach/policy.h>
  44
  45 #include <ipc/ipc_port.h>       /* We use something from in here */
  46
  47 /*
  48  *      task_swappable: [exported]
  49  *
  50  *      Make a task swappable or non-swappable. If made non-swappable,
  51  *      it will be swapped in.
  52  */
  53 kern_return_t
  54 task_swappable(
  55         host_priv_t host_priv,
  56         task_t task,
  57         __unused boolean_t make_swappable)
  58 {
  59         if (host_priv == HOST_PRIV_NULL)
  60                 return (KERN_INVALID_ARGUMENT);
  61
  62         if (task == TASK_NULL)
  63                 return (KERN_INVALID_ARGUMENT);
  64
  65         /*
  66          * We don't support swapping, this call is purely advisory.
  67          */
  68         return (KERN_SUCCESS);
  69 }