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-rw-r--r--test/nptl/tst-cpuclock2.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/test/nptl/tst-cpuclock2.c b/test/nptl/tst-cpuclock2.c
new file mode 100644
index 000000000..d1621f3d0
--- /dev/null
+++ b/test/nptl/tst-cpuclock2.c
@@ -0,0 +1,332 @@
+/* Test program for process and thread CPU clocks.
+ Copyright (C) 2005 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <unistd.h>
+
+#if (_POSIX_THREADS - 0) <= 0
+
+# define TEST_FUNCTION 0
+
+#else
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <pthread.h>
+
+static pthread_barrier_t barrier;
+
+/* This function is intended to rack up both user and system time. */
+static void *
+chew_cpu (void *arg)
+{
+ pthread_barrier_wait (&barrier);
+
+ 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 unsigned long long int
+tsdiff (const struct timespec *before, const struct timespec *after)
+{
+ struct timespec diff = { .tv_sec = after->tv_sec - before->tv_sec,
+ .tv_nsec = after->tv_nsec - before->tv_nsec };
+ while (diff.tv_nsec < 0)
+ {
+ --diff.tv_sec;
+ diff.tv_nsec += 1000000000;
+ }
+ return diff.tv_sec * 1000000000ULL + diff.tv_nsec;
+}
+
+static unsigned long long int
+test_nanosleep (clockid_t clock, const char *which,
+ const struct timespec *before, int *bad)
+{
+ const struct timespec sleeptime = { .tv_nsec = 100000000 };
+ int e = clock_nanosleep (clock, 0, &sleeptime, NULL);
+ if (e == EINVAL || e == ENOTSUP || e == ENOSYS)
+ {
+ printf ("clock_nanosleep not supported for %s CPU clock: %s\n",
+ which, strerror (e));
+ return 0;
+ }
+ if (e != 0)
+ {
+ printf ("clock_nanosleep on %s CPU clock: %s\n", which, strerror (e));
+ *bad = 1;
+ return 0;
+ }
+
+ struct timespec after;
+ if (clock_gettime (clock, &after) < 0)
+ {
+ printf ("clock_gettime on %s CPU clock %lx => %s\n",
+ which, (unsigned long int) clock, strerror (errno));
+ *bad = 1;
+ return 0;
+ }
+
+ unsigned long long int diff = tsdiff (before, &after);
+ if (diff < sleeptime.tv_nsec || diff > sleeptime.tv_nsec * 2)
+ {
+ printf ("clock_nanosleep on %s slept %llu (outside reasonable range)\n",
+ which, diff);
+ *bad = 1;
+ return diff;
+ }
+
+ struct timespec sleeptimeabs = sleeptime;
+ sleeptimeabs.tv_sec += after.tv_sec;
+ sleeptimeabs.tv_nsec += after.tv_nsec;
+ while (sleeptimeabs.tv_nsec > 1000000000)
+ {
+ ++sleeptimeabs.tv_sec;
+ sleeptimeabs.tv_nsec -= 1000000000;
+ }
+ e = clock_nanosleep (clock, TIMER_ABSTIME, &sleeptimeabs, NULL);
+ if (e != 0)
+ {
+ printf ("absolute clock_nanosleep on %s CPU clock: %s\n",
+ which, strerror (e));
+ *bad = 1;
+ return diff;
+ }
+
+ struct timespec afterabs;
+ if (clock_gettime (clock, &afterabs) < 0)
+ {
+ printf ("clock_gettime on %s CPU clock %lx => %s\n",
+ which, (unsigned long int) clock, strerror (errno));
+ *bad = 1;
+ return diff;
+ }
+
+ unsigned long long int sleepdiff = tsdiff (&sleeptimeabs, &afterabs);
+ if (sleepdiff > sleeptime.tv_nsec)
+ {
+ printf ("\
+absolute clock_nanosleep on %s %llu past target (outside reasonable range)\n",
+ which, sleepdiff);
+ *bad = 1;
+ }
+
+ unsigned long long int diffabs = tsdiff (&after, &afterabs);
+ if (diffabs < sleeptime.tv_nsec || diffabs > sleeptime.tv_nsec * 2)
+ {
+ printf ("\
+absolute clock_nanosleep on %s slept %llu (outside reasonable range)\n",
+ which, diffabs);
+ *bad = 1;
+ }
+
+ return diff + diffabs;
+}
+
+
+
+static int
+do_test (void)
+{
+ int result = 0;
+ clockid_t process_clock, th_clock, my_thread_clock;
+ int e;
+ pthread_t th;
+
+ e = clock_getcpuclockid (0, &process_clock);
+ if (e != 0)
+ {
+ printf ("clock_getcpuclockid on self => %s\n", strerror (e));
+ return 1;
+ }
+
+ e = pthread_getcpuclockid (pthread_self (), &my_thread_clock);
+ if (e != 0)
+ {
+ printf ("pthread_getcpuclockid on self => %s\n", strerror (e));
+ return 1;
+ }
+
+ /* This is a kludge. This test fails if the semantics of thread and
+ process clocks are wrong. The old code using hp-timing without kernel
+ support has bogus semantics if there are context switches. We don't
+ fail to report failure when the proper functionality is not available
+ in the kernel. It so happens that Linux kernels without correct CPU
+ clock support also lack CPU timer support, so we use use that to guess
+ that we are using the bogus code and not test it. */
+ timer_t t;
+ if (timer_create (my_thread_clock, NULL, &t) != 0)
+ {
+ printf ("timer_create: %m\n");
+ puts ("No support for CPU clocks with good semantics, skipping test");
+ return 0;
+ }
+ timer_delete (t);
+
+
+ pthread_barrier_init (&barrier, NULL, 2);
+
+ e = pthread_create (&th, NULL, chew_cpu, NULL);
+ if (e != 0)
+ {
+ printf ("pthread_create: %s\n", strerror (e));
+ return 1;
+ }
+
+ e = pthread_getcpuclockid (th, &th_clock);
+ if (e == ENOENT || e == ENOSYS || e == ENOTSUP)
+ {
+ puts ("pthread_getcpuclockid does not support other threads");
+ return 1;
+ }
+
+ pthread_barrier_wait (&barrier);
+
+ struct timespec res;
+ if (clock_getres (th_clock, &res) < 0)
+ {
+ printf ("clock_getres on thread clock %lx => %s\n",
+ (unsigned long int) th_clock, strerror (errno));
+ result = 1;
+ return 1;
+ }
+ printf ("live thread clock %lx resolution %lu.%.9lu\n",
+ (unsigned long int) th_clock, res.tv_sec, res.tv_nsec);
+
+ struct timespec process_before, process_after;
+ if (clock_gettime (process_clock, &process_before) < 0)
+ {
+ printf ("clock_gettime on process clock %lx => %s\n",
+ (unsigned long int) th_clock, strerror (errno));
+ return 1;
+ }
+
+ struct timespec before, after;
+ if (clock_gettime (th_clock, &before) < 0)
+ {
+ printf ("clock_gettime on live thread clock %lx => %s\n",
+ (unsigned long int) th_clock, strerror (errno));
+ return 1;
+ }
+ printf ("live thread before sleep => %lu.%.9lu\n",
+ before.tv_sec, before.tv_nsec);
+
+ struct timespec me_before, me_after;
+ if (clock_gettime (my_thread_clock, &me_before) < 0)
+ {
+ printf ("clock_gettime on live thread clock %lx => %s\n",
+ (unsigned long int) th_clock, strerror (errno));
+ return 1;
+ }
+ printf ("self thread before sleep => %lu.%.9lu\n",
+ me_before.tv_sec, me_before.tv_nsec);
+
+ struct timespec sleeptime = { .tv_nsec = 500000000 };
+ nanosleep (&sleeptime, NULL);
+
+ if (clock_gettime (th_clock, &after) < 0)
+ {
+ printf ("clock_gettime on live thread clock %lx => %s\n",
+ (unsigned long int) th_clock, strerror (errno));
+ return 1;
+ }
+ printf ("live thread after sleep => %lu.%.9lu\n",
+ after.tv_sec, after.tv_nsec);
+
+ if (clock_gettime (process_clock, &process_after) < 0)
+ {
+ printf ("clock_gettime on process clock %lx => %s\n",
+ (unsigned long int) th_clock, strerror (errno));
+ return 1;
+ }
+
+ if (clock_gettime (my_thread_clock, &me_after) < 0)
+ {
+ printf ("clock_gettime on live thread clock %lx => %s\n",
+ (unsigned long int) th_clock, strerror (errno));
+ return 1;
+ }
+ printf ("self thread after sleep => %lu.%.9lu\n",
+ me_after.tv_sec, me_after.tv_nsec);
+
+ unsigned long long int th_diff = tsdiff (&before, &after);
+ unsigned long long int pdiff = tsdiff (&process_before, &process_after);
+ unsigned long long int my_diff = tsdiff (&me_before, &me_after);
+
+ if (th_diff < 100000000 || th_diff > 600000000)
+ {
+ printf ("thread before - after %llu outside reasonable range\n",
+ th_diff);
+ result = 1;
+ }
+
+ if (my_diff > 100000000)
+ {
+ printf ("self thread before - after %llu outside reasonable range\n",
+ my_diff);
+ result = 1;
+ }
+
+ if (pdiff < th_diff)
+ {
+ printf ("process before - after %llu outside reasonable range (%llu)\n",
+ pdiff, th_diff);
+ result = 1;
+ }
+
+ process_after.tv_nsec += test_nanosleep (th_clock, "thread",
+ &after, &result);
+ process_after.tv_nsec += test_nanosleep (process_clock, "process",
+ &process_after, &result);
+ test_nanosleep (CLOCK_PROCESS_CPUTIME_ID,
+ "PROCESS_CPUTIME_ID", &process_after, &result);
+
+ pthread_cancel (th);
+
+ e = clock_nanosleep (CLOCK_THREAD_CPUTIME_ID, 0, &sleeptime, NULL);
+ if (e != EINVAL)
+ {
+ printf ("clock_nanosleep CLOCK_THREAD_CPUTIME_ID: %s\n",
+ strerror (e));
+ result = 1;
+ }
+
+ return result;
+}
+# define TIMEOUT 8
+# define TEST_FUNCTION do_test ()
+#endif
+
+#include "../test-skeleton.c"
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