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(pp: base_pp)) { |
81 | return (pthread_priority_compact_t)base_pp; |
82 | } |
83 | |
84 | return _pthread_priority_make_from_thread_qos(qos, relpri: 0, |
85 | flags: base_pp & _PTHREAD_PRIORITY_OVERCOMMIT_FLAG); |
86 | } |
87 | |