86 lines
3 KiB
C
86 lines
3 KiB
C
/*
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* Copyright (c) 2017 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*
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*/
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#include <pthread/priority_private.h>
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#ifndef QOS_MIN_RELATIVE_PRIORITY // from <sys/qos.h> in userspace
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#define QOS_MIN_RELATIVE_PRIORITY -15
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#endif
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pthread_priority_compact_t
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_pthread_priority_normalize(pthread_priority_t pp)
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{
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if (pp & _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG) {
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return _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG;
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}
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if (_pthread_priority_has_qos(pp)) {
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int relpri = _pthread_priority_relpri(pp);
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if (relpri > 0 || relpri < QOS_MIN_RELATIVE_PRIORITY) {
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pp |= _PTHREAD_PRIORITY_PRIORITY_MASK;
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}
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return pp & (_PTHREAD_PRIORITY_OVERCOMMIT_FLAG |
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_PTHREAD_PRIORITY_FALLBACK_FLAG |
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_PTHREAD_PRIORITY_QOS_CLASS_MASK |
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_PTHREAD_PRIORITY_PRIORITY_MASK);
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}
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return _pthread_unspecified_priority();
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}
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pthread_priority_compact_t
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_pthread_priority_normalize_for_ipc(pthread_priority_t pp)
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{
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if (_pthread_priority_has_qos(pp)) {
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int relpri = _pthread_priority_relpri(pp);
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if (relpri > 0 || relpri < QOS_MIN_RELATIVE_PRIORITY) {
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pp |= _PTHREAD_PRIORITY_PRIORITY_MASK;
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}
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return pp & (_PTHREAD_PRIORITY_QOS_CLASS_MASK |
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_PTHREAD_PRIORITY_PRIORITY_MASK);
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}
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return _pthread_unspecified_priority();
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}
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pthread_priority_compact_t
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_pthread_priority_combine(pthread_priority_t base_pp, thread_qos_t qos)
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{
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if (base_pp & _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG) {
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return _PTHREAD_PRIORITY_EVENT_MANAGER_FLAG;
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}
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if (base_pp & _PTHREAD_PRIORITY_FALLBACK_FLAG) {
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if (!qos) {
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return (pthread_priority_compact_t)base_pp;
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}
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} else if (qos < _pthread_priority_thread_qos(base_pp)) {
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return (pthread_priority_compact_t)base_pp;
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}
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return _pthread_priority_make_from_thread_qos(qos, 0,
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base_pp & _PTHREAD_PRIORITY_OVERCOMMIT_FLAG);
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}
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