1 /* 2 * Copyright (c) 2017 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 30 #include <pthread/priority_private.h> 31 32 #ifndef QOS_MIN_RELATIVE_PRIORITY // from <sys/qos.h> in userspace 33 #define QOS_MIN_RELATIVE_PRIORITY -15 34 #endif 35 36 pthread_priority_compact_t 37 _pthread_priority_normalize(pthread_priority_t pp) 38 { 39 if (pp & _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG) { 40 return _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG; 41 } 42 if (_pthread_priority_has_qos(pp)) { 43 int relpri = _pthread_priority_relpri(pp); 44 if (relpri > 0 || relpri < QOS_MIN_RELATIVE_PRIORITY) { 45 pp |= _PTHREAD_PRIORITY_PRIORITY_MASK; 46 } 47 return pp & (_PTHREAD_PRIORITY_OVERCOMMIT_FLAG | 48 _PTHREAD_PRIORITY_FALLBACK_FLAG | 49 _PTHREAD_PRIORITY_QOS_CLASS_MASK | 50 _PTHREAD_PRIORITY_PRIORITY_MASK); 51 } 52 return _pthread_unspecified_priority(); 53 } 54 55 pthread_priority_compact_t 56 _pthread_priority_normalize_for_ipc(pthread_priority_t pp) 57 { 58 if (_pthread_priority_has_qos(pp)) { 59 int relpri = _pthread_priority_relpri(pp); 60 if (relpri > 0 || relpri < QOS_MIN_RELATIVE_PRIORITY) { 61 pp |= _PTHREAD_PRIORITY_PRIORITY_MASK; 62 } 63 return pp & (_PTHREAD_PRIORITY_QOS_CLASS_MASK | 64 _PTHREAD_PRIORITY_PRIORITY_MASK); 65 } 66 return _pthread_unspecified_priority(); 67 } 68 69 pthread_priority_compact_t 70 _pthread_priority_combine(pthread_priority_t base_pp, thread_qos_t qos) 71 { 72 if (base_pp & _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG) { 73 return _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG; 74 } 75 76 if (base_pp & _PTHREAD_PRIORITY_FALLBACK_FLAG) { 77 if (!qos) { 78 return (pthread_priority_compact_t)base_pp; 79 } 80 } else if (qos < _pthread_priority_thread_qos(base_pp)) { 81 return (pthread_priority_compact_t)base_pp; 82 } 83 84 return _pthread_priority_make_from_thread_qos(qos, 0, 85 base_pp & _PTHREAD_PRIORITY_OVERCOMMIT_FLAG); 86 } 87