POSIX Threads for Windows Code

/*
 * File: semaphore4t.c
 *
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads4w - POSIX Threads for Windows
 *      Copyright 1998 John E. Bossom
 *      Copyright 1999-2018, Pthreads4w contributors
 *
 *      Homepage: https://sourceforge.net/projects/pthreads4w/
 *
 *      The current list of contributors is contained
 *      in the file CONTRIBUTORS included with the source
 *      code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *
 *      https://sourceforge.net/p/pthreads4w/wiki/Contributors/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * --------------------------------------------------------------------------
 *
 * Test Synopsis: Verify sem_getvalue returns the correct number of waiters
 * after threads are cancelled.
 * -
 *
 * Test Method (Validation or Falsification):
 * - Validation
 *
 * Requirements Tested:
 * - sem_timedwait cancellation.
 *
 * Features Tested:
 * -
 *
 * Cases Tested:
 * -
 *
 * Description:
 * -
 *
 * Environment:
 * -
 *
 * Input:
 * - None.
 *
 * Output:
 * - File name, Line number, and failed expression on failure.
 * - No output on success.
 *
 * Assumptions:
 * -
 *
 * Pass Criteria:
 * - Process returns zero exit status.
 *
 * Fail Criteria:
 * - Process returns non-zero exit status.
 */

#include "test.h"

#define MAX_COUNT 100

const long NANOSEC_PER_SEC = 1000000000L;

sem_t s;

void *
thr (void * arg)
{
  assert(sem_timedwait(&s, NULL) == 0);
  return NULL;
}

int
timeoutwithnanos(sem_t sem, int nanoseconds)
{
  struct timespec ts, rel;
  FILETIME ft_before, ft_after;
  int rc;

  rel.tv_sec = 0;
  rel.tv_nsec = nanoseconds;

  GetSystemTimeAsFileTime(&ft_before);
  rc = sem_timedwait(&sem, pthread_win32_getabstime_np(&ts, &rel));

  /* This should have timed out */
  assert(rc != 0);
  assert(errno == ETIMEDOUT);
  GetSystemTimeAsFileTime(&ft_after);
  // We specified a non-zero wait. Time must advance.
  if (ft_before.dwLowDateTime == ft_after.dwLowDateTime && ft_before.dwHighDateTime == ft_after.dwHighDateTime)
    {
      printf("nanoseconds: %d, rc: %d, errno: %d. before filetime: %d, %d; after filetime: %d, %d\n",
          nanoseconds, rc, errno,
          (int)ft_before.dwLowDateTime, (int)ft_before.dwHighDateTime,
          (int)ft_after.dwLowDateTime, (int)ft_after.dwHighDateTime);
      printf("time must advance during sem_timedwait.");
      return 1;
    }
  return 0;
}

int
testtimeout()
{
  int rc = 0;
  sem_t s2;
  int value = 0;
  assert(sem_init(&s2, PTHREAD_PROCESS_PRIVATE, 0) == 0);
  assert(sem_getvalue(&s2, &value) == 0);
  assert(value == 0);

  rc += timeoutwithnanos(s2, 1000);        // 1 microsecond
  rc += timeoutwithnanos(s2, 10 * 1000);   // 10 microseconds
  rc += timeoutwithnanos(s2, 100 * 1000);  // 100 microseconds
  rc += timeoutwithnanos(s2, 1000 * 1000); // 1 millisecond

  return rc;
}

int
testmainstuff()
{
  int value = 0;
  int i;
  pthread_t t[MAX_COUNT+1];

  assert(sem_init(&s, PTHREAD_PROCESS_PRIVATE, 0) == 0);
  assert(sem_getvalue(&s, &value) == 0);
  assert(value == 0);

  for (i = 1; i <= MAX_COUNT; i++)
    {
      assert(pthread_create(&t[i], NULL, thr, NULL) == 0);
      do {
          sched_yield();
          assert(sem_getvalue(&s, &value) == 0);
      } while (value != -i);
      assert(-value == i);
    }

  assert(sem_getvalue(&s, &value) == 0);
  assert(-value == MAX_COUNT);
  assert(pthread_cancel(t[50]) == 0);
  assert(pthread_join(t[50], NULL) == 0);
  assert(sem_getvalue(&s, &value) == 0);
  assert(-value == MAX_COUNT - 1);

  for (i = MAX_COUNT - 2; i >= 0; i--)
    {
      assert(sem_post(&s) == 0);
      assert(sem_getvalue(&s, &value) == 0);
      assert(-value == i);
    }

  for (i = 1; i <= MAX_COUNT; i++)
    {
      if (i != 50)
        {
          assert(pthread_join(t[i], NULL) == 0);
        }
    }

  return 0;
}

int
main()
{
  int rc = 0;

  rc += testmainstuff();
  rc += testtimeout();

  return rc;
}