lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 * |
| 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 |
| 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" |