rtems/testsuites/psxtmtests/psxtmsem05/init.c

/*
 *  COPYRIGHT (c) 1989-2013.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <errno.h>
#include <fcntl.h>
#include <semaphore.h>
#include <coverhd.h>
#include <tmacros.h>
#include <timesys.h>
#include "test_support.h"
#include <pthread.h>
#include <sched.h>
#include <rtems/btimer.h>

const char rtems_test_name[] = "PSXTMSEM 05";

/* forward declarations to avoid warnings */
void *POSIX_Init(void *argument);
void *Middle(void *argument);
void *Low(void *argument);

#define MAX_SEMS  2

sem_t   sem1;

void *Low(
  void *argument
)
{
  int      status;
  benchmark_timer_t end_time;

    status = sem_wait(&sem1); /* semaphore blocks */
  end_time = benchmark_timer_read();

  rtems_test_assert( status == 0 );

  put_time(
    "sem_post: thread waiting preempt",
    end_time,
    OPERATION_COUNT,
    0,
    0
  );

  TEST_END();
  rtems_test_exit( 0 );
  return NULL;
}

void *Middle(
  void *argument
)
{
  int status;

    status = sem_wait(&sem1); /* semaphore blocks */
  rtems_test_assert( status == 0 );

    /* thread switch occurs */

    status = sem_post(&sem1);
  rtems_test_assert( status == 0 );

    /* thread switch occurs */

  /* should never return */
  rtems_test_assert( FALSE );
  return NULL;
}

void *POSIX_Init(
  void *argument
)
{
  int                 i;
  int                 status;
  pthread_t           threadId;
  pthread_attr_t      attr;
  struct sched_param  param;

  TEST_BEGIN();

  /*
   * Deliberately create the semaphore BEFORE the threads.  This way the
   * threads should preempt this thread and block as they are created.
   */
  status = sem_init( &sem1, 0, 1 );
  rtems_test_assert( status == 0 );

  /*
   * Obtain the semaphore so the threads will block.
   */
  status = sem_wait( &sem1 );
  rtems_test_assert( status == 0 );

  /*
   * Now lower our priority
   */
  status = pthread_attr_init( &attr );
  rtems_test_assert( status == 0 );

  status = pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
  rtems_test_assert( status == 0 );

  status = pthread_attr_setschedpolicy( &attr, SCHED_RR );
  rtems_test_assert( status == 0 );

  param.sched_priority = 2;
  status = pthread_attr_setschedparam( &attr, &param );
  rtems_test_assert( status == 0 );

  /*
   * And create rest of threads as more important than we are.  They
   * will preempt us as they are created and block.
   */
  for ( i=0 ; i < OPERATION_COUNT ; i++ ) {

    param.sched_priority = 3 + i;
    status = pthread_attr_setschedparam( &attr, &param );
    rtems_test_assert( status == 0 );

    status = pthread_create(
      &threadId,
      &attr,
      (i == OPERATION_COUNT - 1) ? Low : Middle,
      NULL
    );
    rtems_test_assert( status == 0 );
  }
  
  /*
   * Now start the timer which will be stopped in Low.
   * Release the semaphore so threads unblock and preempt.
   */
  benchmark_timer_initialize();

    status = sem_post( &sem1 );
      /* thread switch occurs */

  /* should never return */
  rtems_test_assert( FALSE );
  return NULL;
}

/* configuration information */

#define CONFIGURE_APPLICATION_NEEDS_CONSOLE_DRIVER
#define CONFIGURE_APPLICATION_NEEDS_TIMER_DRIVER

#define CONFIGURE_MAXIMUM_POSIX_THREADS     OPERATION_COUNT + 2
#define CONFIGURE_POSIX_INIT_THREAD_TABLE

#define CONFIGURE_INIT

#include <rtems/confdefs.h>
  /* end of file */