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glibc/rt/tst-cputimer1.c
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/* Tests for POSIX timer implementation using process CPU clock. */ | |
#include <unistd.h> | |
#if _POSIX_THREADS && defined _POSIX_CPUTIME | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <fcntl.h> | |
#include <time.h> | |
#include <pthread.h> | |
#define TEST_CLOCK CLOCK_PROCESS_CPUTIME_ID | |
#define TEST_CLOCK_MISSING(clock) \ | |
(setup_test () ? "process CPU clock timer support" : NULL) | |
/* This function is intended to rack up both user and system time. */ | |
static void * | |
chew_cpu (void *arg) | |
{ | |
while (1) | |
{ | |
static volatile char buf[4096]; | |
for (int i = 0; i < 100; ++i) | |
for (size_t j = 0; j < sizeof buf; ++j) | |
buf[j] = 0xaa; | |
int nullfd = open ("/dev/null", O_WRONLY); | |
for (int i = 0; i < 100; ++i) | |
for (size_t j = 0; j < sizeof buf; ++j) | |
buf[j] = 0xbb; | |
write (nullfd, (char *) buf, sizeof buf); | |
close (nullfd); | |
} | |
return NULL; | |
} | |
static int | |
setup_test (void) | |
{ | |
/* Test timers on our own process CPU clock by having a worker thread | |
eating CPU. First make sure we can make such timers at all. */ | |
timer_t t; | |
if (timer_create (TEST_CLOCK, NULL, &t) != 0) | |
{ | |
printf ("timer_create: %m\n"); | |
return 1; | |
} | |
timer_delete (t); | |
pthread_t th; | |
int e = pthread_create (&th, NULL, chew_cpu, NULL); | |
if (e != 0) | |
{ | |
printf ("pthread_create: %s\n", strerror (e)); | |
exit (1); | |
} | |
return 0; | |
} | |
#else | |
# define TEST_CLOCK_MISSING(clock) "process clocks" | |
#endif | |
#include "tst-timer4.c" |