semaphore1.c

pthread source code,you can compile directly

/*
 * File: semaphore1.c
 *
 *
 * --------------------------------------------------------------------------
 *
 *      Pthreads-win32 - POSIX Threads Library for Win32
 *      Copyright(C) 1998 John E. Bossom
 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
 * 
 *      Contact Email: [e-mail]
 * 
 *      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:
 *      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
 *
 * --------------------------------------------------------------------------
 *
 * Test Synopsis: Verify trywait() returns -1 and sets EAGAIN.
 * - 
 *
 * Test Method (Validation or Falsification):
 * - Validation
 *
 * Requirements Tested:
 * - 
 *
 * 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"

void *
thr(void * arg)
{
  sem_t s;
  int result;

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

  assert((result = sem_trywait(&s)) == -1);

  if ( result == -1 )
  {
    int err = errno;
    printf("thread: sem_trywait 1: expecting error %s: got %s\n",
	   error_string[EAGAIN], error_string[err]); fflush(stdout);
    assert(err == EAGAIN);
  }
  else
  {
    printf("thread: ok 1\n");
  }

  assert((result = sem_post(&s)) == 0);

  assert((result = sem_trywait(&s)) == 0);

  if ( result == -1 )
  {
    perror("thread: sem_trywait 2");
  }
  else
  {
    printf("thread: ok 2\n");
  }

  assert(sem_post(&s) == 0);

  return 0;
}


int
main()
{
  pthread_t t;
  sem_t s;
  int result;

  assert(pthread_create(&t, NULL, thr, NULL) == 0);
  assert(pthread_join(t, (void **)&result) == 0);
  assert(result == 0);

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

  assert((result = sem_trywait(&s)) == -1);

  if ( result == -1 )
  {
    int err = errno;
    printf("main: sem_trywait 1: expecting error %s: got %s\n",
	   error_string[EAGAIN], error_string[err]); fflush(stdout);
    assert(err == EAGAIN);
  }
  else
  {
    printf("main: ok 1\n");
  }

  assert((result = sem_post(&s)) == 0);

  assert((result = sem_trywait(&s)) == 0);

  if ( result == -1 )
  {
    perror("main: sem_trywait 2");
  }
  else
  {
    printf("main: ok 2\n");
  }

  assert(sem_post(&s) == 0);

  return 0;
}