1 | /* Copyright (C) 2006-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <pthread.h> |
20 | #include <sched.h> |
21 | #include <stdio.h> |
22 | #include <stdlib.h> |
23 | #include <string.h> |
24 | #include <unistd.h> |
25 | #include <sys/syscall.h> |
26 | |
27 | /* This test is Linux specific. */ |
28 | #define CHECK_TPP_PRIORITY(normal, boosted) \ |
29 | do \ |
30 | { \ |
31 | pid_t tid = syscall (__NR_gettid); \ |
32 | \ |
33 | struct sched_param cep_sp; \ |
34 | int cep_policy; \ |
35 | if (pthread_getschedparam (pthread_self (), &cep_policy, \ |
36 | &cep_sp) != 0) \ |
37 | { \ |
38 | puts ("getschedparam failed"); \ |
39 | ret = 1; \ |
40 | } \ |
41 | else if (cep_sp.sched_priority != (normal)) \ |
42 | { \ |
43 | printf ("unexpected priority %d != %d\n", \ |
44 | cep_sp.sched_priority, (normal)); \ |
45 | } \ |
46 | if (syscall (__NR_sched_getparam, tid, &cep_sp) == 0 \ |
47 | && cep_sp.sched_priority != (boosted)) \ |
48 | { \ |
49 | printf ("unexpected boosted priority %d != %d\n", \ |
50 | cep_sp.sched_priority, (boosted)); \ |
51 | ret = 1; \ |
52 | } \ |
53 | } \ |
54 | while (0) |
55 | |
56 | int fifo_min, fifo_max; |
57 | |
58 | void |
59 | init_tpp_test (void) |
60 | { |
61 | fifo_min = sched_get_priority_min (SCHED_FIFO); |
62 | if (fifo_min < 0) |
63 | { |
64 | printf (format: "couldn't get min priority for SCHED_FIFO: %m\n" ); |
65 | exit (1); |
66 | } |
67 | |
68 | fifo_max = sched_get_priority_max (SCHED_FIFO); |
69 | if (fifo_max < 0) |
70 | { |
71 | printf (format: "couldn't get max priority for SCHED_FIFO: %m\n" ); |
72 | exit (1); |
73 | } |
74 | |
75 | if (fifo_min > 4 || fifo_max < 10) |
76 | { |
77 | printf (format: "%d..%d SCHED_FIFO priority interval not suitable for this test\n" , |
78 | fifo_min, fifo_max); |
79 | exit (0); |
80 | } |
81 | |
82 | struct sched_param sp; |
83 | memset (&sp, 0, sizeof (sp)); |
84 | sp.sched_priority = 4; |
85 | int e = pthread_setschedparam (target_thread: pthread_self (), SCHED_FIFO, param: &sp); |
86 | if (e != 0) |
87 | { |
88 | errno = e; |
89 | printf (format: "cannot set scheduling params: %m\n" ); |
90 | exit (0); |
91 | } |
92 | } |
93 | |