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
_pthread_priority_normalize(pthread_priority_t pp)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
_pthread_priority_normalize_for_ipc(pthread_priority_t pp)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
_pthread_priority_combine(pthread_priority_t base_pp,thread_qos_t qos)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