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84060bad RM |
1 | /* Tests for POSIX timer implementation using process CPU clock. */ |
2 | ||
3 | #include <unistd.h> | |
4 | ||
5 | #if _POSIX_THREADS && defined _POSIX_CPUTIME | |
6 | ||
7 | #include <stdio.h> | |
8 | #include <stdlib.h> | |
9 | #include <string.h> | |
10 | #include <fcntl.h> | |
11 | #include <time.h> | |
12 | #include <pthread.h> | |
13 | ||
026a84a5 FB |
14 | #include <support/xunistd.h> |
15 | ||
84060bad RM |
16 | #define TEST_CLOCK CLOCK_PROCESS_CPUTIME_ID |
17 | #define TEST_CLOCK_MISSING(clock) \ | |
18 | (setup_test () ? "process CPU clock timer support" : NULL) | |
19 | ||
20 | /* This function is intended to rack up both user and system time. */ | |
21 | static void * | |
22 | chew_cpu (void *arg) | |
23 | { | |
24 | while (1) | |
25 | { | |
26 | static volatile char buf[4096]; | |
27 | for (int i = 0; i < 100; ++i) | |
28 | for (size_t j = 0; j < sizeof buf; ++j) | |
29 | buf[j] = 0xaa; | |
30 | int nullfd = open ("/dev/null", O_WRONLY); | |
31 | for (int i = 0; i < 100; ++i) | |
32 | for (size_t j = 0; j < sizeof buf; ++j) | |
33 | buf[j] = 0xbb; | |
026a84a5 | 34 | xwrite (nullfd, (char *) buf, sizeof buf); |
84060bad RM |
35 | close (nullfd); |
36 | } | |
37 | ||
38 | return NULL; | |
39 | } | |
40 | ||
41 | static int | |
42 | setup_test (void) | |
43 | { | |
44 | /* Test timers on our own process CPU clock by having a worker thread | |
45 | eating CPU. First make sure we can make such timers at all. */ | |
46 | ||
47 | timer_t t; | |
48 | if (timer_create (TEST_CLOCK, NULL, &t) != 0) | |
49 | { | |
50 | printf ("timer_create: %m\n"); | |
51 | return 1; | |
52 | } | |
53 | timer_delete (t); | |
54 | ||
55 | pthread_t th; | |
56 | int e = pthread_create (&th, NULL, chew_cpu, NULL); | |
57 | if (e != 0) | |
58 | { | |
59 | printf ("pthread_create: %s\n", strerror (e)); | |
60 | exit (1); | |
61 | } | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
66 | #else | |
67 | # define TEST_CLOCK_MISSING(clock) "process clocks" | |
68 | #endif | |
69 | ||
70 | #include "tst-timer4.c" |