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
init_tpp_test(void)59 init_tpp_test (void)
60 {
61 fifo_min = sched_get_priority_min (SCHED_FIFO);
62 if (fifo_min < 0)
63 {
64 printf ("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 ("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 ("%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 (pthread_self (), SCHED_FIFO, &sp);
86 if (e != 0)
87 {
88 errno = e;
89 printf ("cannot set scheduling params: %m\n");
90 exit (0);
91 }
92 }
93