kern/kern_policy.c

   1 /*
   2  * Copyright (c) 2013 Apple 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 #include "kern_internal.h"
  30 #include <kern/debug.h>
  31
  32 pthread_priority_t
  33 pthread_qos_class_get_priority(int qos)
  34 {
  35     /* Map the buckets we have in pthread_priority_t into a QoS tier. */
  36     switch (qos) {
  37                 case THREAD_QOS_USER_INTERACTIVE: return _pthread_priority_make_newest(QOS_CLASS_USER_INTERACTIVE, 0, 0);
  38                 case THREAD_QOS_USER_INITIATED: return _pthread_priority_make_newest(QOS_CLASS_USER_INITIATED, 0, 0);
  39                 case THREAD_QOS_LEGACY: return _pthread_priority_make_newest(QOS_CLASS_DEFAULT, 0, 0);
  40                 case THREAD_QOS_UTILITY: return _pthread_priority_make_newest(QOS_CLASS_UTILITY, 0, 0);
  41                 case THREAD_QOS_BACKGROUND: return _pthread_priority_make_newest(QOS_CLASS_BACKGROUND, 0, 0);
  42                 case THREAD_QOS_MAINTENANCE: return _pthread_priority_make_newest(QOS_CLASS_MAINTENANCE, 0, 0);
  43                 default: return _pthread_priority_make_newest(QOS_CLASS_UNSPECIFIED, 0, 0);
  44     }
  45 }
  46
  47 int
  48 pthread_priority_get_qos_class(pthread_priority_t priority)
  49 {
  50         /* Map the buckets we have in pthread_priority_t into a QoS tier. */
  51         switch (_pthread_priority_get_qos_newest(priority)) {
  52                 case QOS_CLASS_USER_INTERACTIVE: return THREAD_QOS_USER_INTERACTIVE;
  53                 case QOS_CLASS_USER_INITIATED: return THREAD_QOS_USER_INITIATED;
  54                 case QOS_CLASS_DEFAULT: return THREAD_QOS_LEGACY;
  55                 case QOS_CLASS_UTILITY: return THREAD_QOS_UTILITY;
  56                 case QOS_CLASS_BACKGROUND: return THREAD_QOS_BACKGROUND;
  57                 case QOS_CLASS_MAINTENANCE: return THREAD_QOS_MAINTENANCE;
  58                 default: return THREAD_QOS_UNSPECIFIED;
  59         }
  60 }
  61
  62 pthread_priority_t
  63 pthread_priority_from_class_index(int index)
  64 {
  65         qos_class_t qos;
  66         switch (index) {
  67                 case 0: qos = QOS_CLASS_USER_INTERACTIVE; break;
  68                 case 1: qos = QOS_CLASS_USER_INITIATED; break;
  69                 case 2: qos = QOS_CLASS_DEFAULT; break;
  70                 case 3: qos = QOS_CLASS_UTILITY; break;
  71                 case 4: qos = QOS_CLASS_BACKGROUND; break;
  72                 case 5: qos = QOS_CLASS_MAINTENANCE; break;
  73                 default:
  74                         /* Return the utility band if we don't understand the input. */
  75                         qos = QOS_CLASS_UTILITY;
  76         }
  77
  78         pthread_priority_t priority;
  79         priority = _pthread_priority_make_newest(qos, 0, 0);
  80
  81         return priority;
  82 }
  83
  84 int
  85 pthread_priority_get_class_index(pthread_priority_t priority)
  86 {
  87         switch (_pthread_priority_get_qos_newest(priority)) {
  88                 case QOS_CLASS_USER_INTERACTIVE: return 0;
  89                 case QOS_CLASS_USER_INITIATED: return 1;
  90                 case QOS_CLASS_DEFAULT: return 2;
  91                 case QOS_CLASS_UTILITY: return 3;
  92                 case QOS_CLASS_BACKGROUND: return 4;
  93                 case QOS_CLASS_MAINTENANCE: return 5;
  94                 default:
  95                         /* Return the utility band if we don't understand the input. */
  96                         return 2;
  97         }
  98 }