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