-/*
- * Copyright (c) 2013 Apple Inc. All rights reserved.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. The rights granted to you under the License
- * may not be used to create, or enable the creation or redistribution of,
- * unlawful or unlicensed copies of an Apple operating system, or to
- * circumvent, violate, or enable the circumvention or violation of, any
- * terms of an Apple operating system software license agreement.
- *
- * Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
- */
-
-#include "kern_internal.h"
-#include <kern/debug.h>
-#include <kern/assert.h>
-
-pthread_priority_t
-thread_qos_get_pthread_priority(int qos)
-{
- /* Map the buckets we have in pthread_priority_t into a QoS tier. */
- switch (qos) {
- case THREAD_QOS_USER_INTERACTIVE: return _pthread_priority_make_newest(QOS_CLASS_USER_INTERACTIVE, 0, 0);
- case THREAD_QOS_USER_INITIATED: return _pthread_priority_make_newest(QOS_CLASS_USER_INITIATED, 0, 0);
- case THREAD_QOS_LEGACY: return _pthread_priority_make_newest(QOS_CLASS_DEFAULT, 0, 0);
- case THREAD_QOS_UTILITY: return _pthread_priority_make_newest(QOS_CLASS_UTILITY, 0, 0);
- case THREAD_QOS_BACKGROUND: return _pthread_priority_make_newest(QOS_CLASS_BACKGROUND, 0, 0);
- case THREAD_QOS_MAINTENANCE: return _pthread_priority_make_newest(QOS_CLASS_MAINTENANCE, 0, 0);
- default: return _pthread_priority_make_newest(QOS_CLASS_UNSPECIFIED, 0, 0);
- }
-}
-
-int
-thread_qos_get_class_index(int qos)
-{
- switch (qos) {
- case THREAD_QOS_USER_INTERACTIVE: return 0;
- case THREAD_QOS_USER_INITIATED: return 1;
- case THREAD_QOS_LEGACY: return 2;
- case THREAD_QOS_UTILITY: return 3;
- case THREAD_QOS_BACKGROUND: return 4;
- case THREAD_QOS_MAINTENANCE: return 5;
- default: return 2;
- }
-}
-
-int
-pthread_priority_get_thread_qos(pthread_priority_t priority)
-{
- /* Map the buckets we have in pthread_priority_t into a QoS tier. */
- switch (_pthread_priority_get_qos_newest(priority)) {
- case QOS_CLASS_USER_INTERACTIVE: return THREAD_QOS_USER_INTERACTIVE;
- case QOS_CLASS_USER_INITIATED: return THREAD_QOS_USER_INITIATED;
- case QOS_CLASS_DEFAULT: return THREAD_QOS_LEGACY;
- case QOS_CLASS_UTILITY: return THREAD_QOS_UTILITY;
- case QOS_CLASS_BACKGROUND: return THREAD_QOS_BACKGROUND;
- case QOS_CLASS_MAINTENANCE: return THREAD_QOS_MAINTENANCE;
- default: return THREAD_QOS_UNSPECIFIED;
- }
-}
-
-int
-pthread_priority_get_class_index(pthread_priority_t priority)
-{
- return qos_class_get_class_index(_pthread_priority_get_qos_newest(priority));
-}
-
-pthread_priority_t
-class_index_get_pthread_priority(int index)
-{
- qos_class_t qos;
- switch (index) {
- case 0: qos = QOS_CLASS_USER_INTERACTIVE; break;
- case 1: qos = QOS_CLASS_USER_INITIATED; break;
- case 2: qos = QOS_CLASS_DEFAULT; break;
- case 3: qos = QOS_CLASS_UTILITY; break;
- case 4: qos = QOS_CLASS_BACKGROUND; break;
- case 5: qos = QOS_CLASS_MAINTENANCE; break;
- case 6: assert(index != 6); // EVENT_MANAGER should be handled specially
- default:
- /* Return the utility band if we don't understand the input. */
- qos = QOS_CLASS_UTILITY;
- }
-
- pthread_priority_t priority;
- priority = _pthread_priority_make_newest(qos, 0, 0);
-
- return priority;
-}
-
-int
-class_index_get_thread_qos(int class)
-{
- int thread_qos;
- switch (class) {
- case 0: thread_qos = THREAD_QOS_USER_INTERACTIVE; break;
- case 1: thread_qos = THREAD_QOS_USER_INITIATED; break;
- case 2: thread_qos = THREAD_QOS_LEGACY; break;
- case 3: thread_qos = THREAD_QOS_UTILITY; break;
- case 4: thread_qos = THREAD_QOS_BACKGROUND; break;
- case 5: thread_qos = THREAD_QOS_MAINTENANCE; break;
- case 6: thread_qos = THREAD_QOS_LAST; break;
- default:
- thread_qos = THREAD_QOS_LAST;
- }
- return thread_qos;
-}
-
-int
-qos_class_get_class_index(int qos)
-{
- switch (qos){
- case QOS_CLASS_USER_INTERACTIVE: return 0;
- case QOS_CLASS_USER_INITIATED: return 1;
- case QOS_CLASS_DEFAULT: return 2;
- case QOS_CLASS_UTILITY: return 3;
- case QOS_CLASS_BACKGROUND: return 4;
- case QOS_CLASS_MAINTENANCE: return 5;
- default:
- /* Return the default band if we don't understand the input. */
- return 2;
- }
-}
-
-/**
- * Shims to help the kernel understand pthread_priority_t
- */
-
-integer_t
-_thread_qos_from_pthread_priority(unsigned long priority, unsigned long *flags)
-{
- if (flags != NULL){
- *flags = (int)_pthread_priority_get_flags(priority);
- }
- int thread_qos = pthread_priority_get_thread_qos(priority);
- if (thread_qos == THREAD_QOS_UNSPECIFIED && flags != NULL){
- *flags |= _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG;
- }
- return thread_qos;
-}
-
-pthread_priority_t
-_pthread_priority_canonicalize(pthread_priority_t priority, boolean_t for_propagation)
-{
- qos_class_t qos_class;
- int relpri;
- unsigned long flags = _pthread_priority_get_flags(priority);
- _pthread_priority_split_newest(priority, qos_class, relpri);
-
- if (for_propagation) {
- flags = 0;
- if (relpri > 0 || relpri < -15) relpri = 0;
- } else {
- if (qos_class == QOS_CLASS_UNSPECIFIED) {
- flags = _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG;
- } else if (flags & (_PTHREAD_PRIORITY_EVENT_MANAGER_FLAG|_PTHREAD_PRIORITY_SCHED_PRI_FLAG)){
- flags = _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG;
- qos_class = QOS_CLASS_UNSPECIFIED;
- } else {
- flags &= _PTHREAD_PRIORITY_OVERCOMMIT_FLAG|_PTHREAD_PRIORITY_EVENT_MANAGER_FLAG;
- }
-
- relpri = 0;
- }
-
- return _pthread_priority_make_newest(qos_class, relpri, flags);
-}
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