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