pthread/spawn.h

   1 /*
   2  * Copyright (c) 2014 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_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. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #ifndef _PTHREAD_SPAWN_H
  25 #define _PTHREAD_SPAWN_H
  26
  27 /*!
  28  * @group posix_spawn QOS class support
  29  * Apple extensions to posix_spawn(2) and posix_spawnp(2)
  30  */
  31
  32 #include <pthread/pthread.h>
  33 #include <spawn.h>
  34
  35 __BEGIN_DECLS
  36
  37 /*!
  38  * @function posix_spawnattr_set_qos_class_np
  39  *
  40  * @abstract
  41  * Sets the QOS class property of a posix_spawn attributes object, which may be
  42  * used to specify the QOS class a process should be spawned with.
  43  *
  44  * @discussion
  45  * The QOS class specified at the time of process spawn determines both the
  46  * initial requested QOS class of the main thread in the new process, and the
  47  * interpretation by the system of all QOS class values requested by threads in
  48  * the process.
  49  *
  50  * @param __attr
  51  * The spawn attributes object to modify.
  52  *
  53  * @param __qos_class
  54  * A QOS class value:
  55  *      - QOS_CLASS_UTILITY
  56  *      - QOS_CLASS_BACKGROUND
  57  * EINVAL will be returned if any other value is provided.
  58  *
  59  * @return
  60  * Zero if successful, otherwise an errno value.
  61  */
  62 __API_AVAILABLE(macos(10.10), ios(8.0))
  63 int
  64 posix_spawnattr_set_qos_class_np(posix_spawnattr_t * __restrict __attr,
  65                                  qos_class_t __qos_class);
  66
  67 /*!
  68  * @function posix_spawnattr_get_qos_class_np
  69  *
  70  * @abstract
  71  * Gets the QOS class property of a posix_spawn attributes object.
  72  *
  73  * @param __attr
  74  * The spawn attributes object to inspect.
  75  *
  76  * @param __qos_class
  77  * On output, a QOS class value:
  78  *      - QOS_CLASS_UTILITY
  79  *      - QOS_CLASS_BACKGROUND
  80  *      - QOS_CLASS_UNSPECIFIED
  81  *
  82  * @return
  83  * Zero if successful, otherwise an errno value.
  84  */
  85 __API_AVAILABLE(macos(10.10), ios(8.0))
  86 int
  87 posix_spawnattr_get_qos_class_np(const posix_spawnattr_t *__restrict __attr,
  88                                  qos_class_t * __restrict __qos_class);
  89
  90 __END_DECLS
  91
  92 #endif // _PTHREAD_SPAWN_H