2.5-18.1

1 files changed, 332 insertions, 0 deletions

diff --git a/rt/tst-cpuclock2.c b/rt/tst-cpuclock2.c
new file mode 100644
index 0000000..d1621f3
--- /dev/null
+++ b/rt/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"