relibc_pthreads-emb/tests/tsd2.c

/*
 * tsd2.c
 *
 * Test Thread Specific Data (TSD) key creation and destruction.
 *
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
 *      Copyright(C) 2008 Jason Schmidlapp
 *
 *      Contact Email: [email protected]
 *
 *
 *      Based upon Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 *
 *      Contact Email: [email protected]
 *
 *      The original list of contributors to the Pthreads-win32 project
 *      is contained in the file CONTRIBUTORS.ptw32 included with the
 *      source code distribution. The list can also be seen at the
 *      following World Wide Web location:
 *      http://sources.redhat.com/pthreads-win32/contributors.html
 *
 *      This 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 of the License, or (at your option) any later version.
 *
 *      This 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 this library in the file COPYING.LIB;
 *      if not, write to the Free Software Foundation, Inc.,
 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 *
 *
 * --------------------------------------------------------------------------
 *
 * Description:
 * -
 *
 * Test Method (validation or falsification):
 * - validation
 *
 * Requirements Tested:
 * - keys are created for each existing thread including the main thread
 * - keys are created for newly created threads
 * - keys are thread specific
 * - destroy routine is called on each thread exit including the main thread
 *
 * Features Tested:
 * -
 *
 * Cases Tested:
 * -
 *
 * Environment:
 * -
 *
 * Input:
 * - none
 *
 * Output:
 * - text to stdout
 *
 * Assumptions:
 * - already validated:     pthread_create()
 *                          pthread_once()
 * - main thread also has a POSIX thread identity
 *
 * Pass Criteria:
 * - stdout matches file reference/tsd1.out
 *
 * Fail Criteria:
 * - fails to match file reference/tsd1.out
 * - output identifies failed component
 */

#include "test.h"
#include "implement.h"
#include <sched.h>


enum
{
  NUM_THREADS = 20
};

static pthread_key_t key = NULL;
static int accesscount[NUM_THREADS];
static int thread_set[NUM_THREADS];
static int thread_destroyed[NUM_THREADS];
static pthread_barrier_t startBarrier;

static void
destroy_key(void * arg)
{
  int * j = (int *) arg;

  (*j)++;

  /* Set TSD key from the destructor to test destructor iteration */
  if (*j == 2)
    assert(pthread_setspecific(key, arg) == 0);
  else
    assert(*j == 3);

  thread_destroyed[j - accesscount] = 1;
}

static void
setkey(void * arg)
{
  int * j = (int *) arg;

  thread_set[j - accesscount] = 1;

  assert(*j == 0);

  assert(pthread_getspecific(key) == NULL);

  assert(pthread_setspecific(key, arg) == 0);
  assert(pthread_setspecific(key, arg) == 0);
  assert(pthread_setspecific(key, arg) == 0);

  assert(pthread_getspecific(key) == arg);

  (*j)++;

  assert(*j == 1);
}

static void *
mythread(void * arg)
{
  (void) pthread_barrier_wait(&startBarrier);

  setkey(arg);

  return 0;

  /* Exiting the thread will call the key destructor. */
}

int pthread_test_tsd2()
{
  int i;
  int fail = 0;
  pthread_t thread[NUM_THREADS];

  /* Just to avoid compiler warnings */
  thread_set[0] = thread_set[0];
  thread_destroyed[0] = thread_destroyed[0];

  assert(pthread_barrier_init(&startBarrier, NULL, NUM_THREADS/2) == 0);

  for (i = 1; i < NUM_THREADS/2; i++)
    {
      accesscount[i] = thread_set[i] = thread_destroyed[i] = 0;
      assert(pthread_create(&thread[i], NULL, mythread, (void *)&accesscount[i]) == 0);
    }

  /*
   * Here we test that existing threads will get a key created
   * for them.
   */
  assert(pthread_key_create(&key, destroy_key) == 0);

  (void) pthread_barrier_wait(&startBarrier);

  /*
   * Test main thread key.
   */
  accesscount[0] = 0;
  setkey((void *) &accesscount[0]);

  /*
   * Here we test that new threads will get a key created
   * for them.
   */
  for (i = NUM_THREADS/2; i < NUM_THREADS; i++)
    {
      accesscount[i] = thread_set[i] = thread_destroyed[i] = 0;
      assert(pthread_create(&thread[i], NULL, mythread, (void *)&accesscount[i]) == 0);
    }

  /*
   * Wait for all threads to complete.
   */
  for (i = 1; i < NUM_THREADS; i++)
    {
      int result = 0;

      assert(pthread_join(thread[i], (void **) &result) == 0);
    }

  assert(pthread_key_delete(key) == 0);

  assert(pthread_barrier_destroy(&startBarrier) == 0);

  for (i = 1; i < NUM_THREADS; i++)
    {
      /*
       * The counter is incremented once when the key is set to
       * a value, and again when the key is destroyed. If the key
       * doesn't get set for some reason then it will still be
       * NULL and the destroy function will not be called, and
       * hence accesscount will not equal 2.
       */
      if (accesscount[i] != 3)
        {
          fail++;
        }
    }

  fflush(stderr);

  return (fail);
}