1 /* Tests for POSIX timer implementation using thread CPU clock. */
2
3 #include <unistd.h>
4
5 #if _POSIX_THREADS && defined _POSIX_CPUTIME
6
7 #include <errno.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <fcntl.h>
12 #include <time.h>
13 #include <pthread.h>
14
15 static clockid_t worker_thread_clock;
16
17 #define TEST_CLOCK worker_thread_clock
18 #define TEST_CLOCK_MISSING(clock) \
19 (setup_test () ? "thread CPU clock timer support" : NULL)
20
21 /* This function is intended to rack up both user and system time. */
22 static void *
chew_cpu(void * arg)23 chew_cpu (void *arg)
24 {
25 while (1)
26 {
27 static volatile char buf[4096];
28 for (int i = 0; i < 100; ++i)
29 for (size_t j = 0; j < sizeof buf; ++j)
30 buf[j] = 0xaa;
31 int nullfd = open ("/dev/null", O_WRONLY);
32 for (int i = 0; i < 100; ++i)
33 for (size_t j = 0; j < sizeof buf; ++j)
34 buf[j] = 0xbb;
35 write (nullfd, (char *) buf, sizeof buf);
36 close (nullfd);
37 }
38
39 return NULL;
40 }
41
42 static int
setup_test(void)43 setup_test (void)
44 {
45 /* Test timers on a thread CPU clock by having a worker thread eating
46 CPU. First make sure we can make such timers at all. */
47
48 pthread_t th;
49 int e = pthread_create (&th, NULL, chew_cpu, NULL);
50 if (e != 0)
51 {
52 printf ("pthread_create: %s\n", strerror (e));
53 exit (1);
54 }
55
56 e = pthread_getcpuclockid (th, &worker_thread_clock);
57 if (e == EPERM || e == ENOENT || e == ENOTSUP)
58 {
59 puts ("pthread_getcpuclockid does not support other threads");
60 return 1;
61 }
62 if (e != 0)
63 {
64 printf ("pthread_getcpuclockid: %s\n", strerror (e));
65 exit (1);
66 }
67
68 timer_t t;
69 if (timer_create (TEST_CLOCK, NULL, &t) != 0)
70 {
71 printf ("timer_create: %m\n");
72 return 1;
73 }
74 timer_delete (t);
75
76 return 0;
77 }
78
79 #else
80 # define TEST_CLOCK_MISSING(clock) "process clocks"
81 #endif
82
83 #include "tst-timer4.c"
84