osfmk/kern/task_swap.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  *              File:   kern/task_swap.c
  35  *
  36  *      Task residency management primitives implementation.
  37  */
  38 #include <mach_assert.h>
  39 #include <task_swapper.h>
  40
  41 #include <kern/spl.h>
  42 #include <kern/lock.h>
  43 #include <kern/queue.h>
  44 #include <kern/host.h>
  45 #include <kern/task.h>
  46 #include <kern/task_swap.h>
  47 #include <kern/thread.h>
  48 #include <kern/host_statistics.h>
  49 #include <kern/misc_protos.h>
  50 #include <kern/assert.h>
  51 #include <mach/policy.h>
  52
  53 #include <ipc/ipc_port.h>       /* We use something from in here */
  54
  55 /*
  56  *      task_swappable: [exported]
  57  *
  58  *      Make a task swappable or non-swappable. If made non-swappable,
  59  *      it will be swapped in.
  60  */
  61 kern_return_t
  62 task_swappable(
  63         host_priv_t host_priv,
  64         task_t task,
  65         __unused boolean_t make_swappable)
  66 {
  67         if (host_priv == HOST_PRIV_NULL)
  68                 return (KERN_INVALID_ARGUMENT);
  69
  70         if (task == TASK_NULL)
  71                 return (KERN_INVALID_ARGUMENT);
  72
  73         /*
  74          * We don't support swapping, this call is purely advisory.
  75          */
  76         return (KERN_SUCCESS);
  77 }