1 /* Tests for POSIX timer implementation using process CPU clock. */
5 #if _POSIX_THREADS && defined _POSIX_CPUTIME
14 #include <support/xunistd.h>
16 #define TEST_CLOCK CLOCK_PROCESS_CPUTIME_ID
17 #define TEST_CLOCK_MISSING(clock) \
18 (setup_test () ? "process CPU clock timer support" : NULL)
20 /* This function is intended to rack up both user and system time. */
26 static volatile char buf[4096];
27 for (int i = 0; i < 100; ++i)
28 for (size_t j = 0; j < sizeof buf; ++j)
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)
34 xwrite (nullfd, (char *) buf, sizeof buf);
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. */
48 if (timer_create (TEST_CLOCK, NULL, &t) != 0)
50 printf ("timer_create: %m\n");
56 int e = pthread_create (&th, NULL, chew_cpu, NULL);
59 printf ("pthread_create: %s\n", strerror (e));
67 # define TEST_CLOCK_MISSING(clock) "process clocks"
70 #include "tst-timer4.c"