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/*

 *  $Id: semaphorewaitsupp.c,v 1.2 2001-09-27 11:59:17 chris Exp $

 */

#include <stdarg.h>

#include <errno.h>

#include <fcntl.h>

#include <pthread.h>

#include <semaphore.h>

#include <limits.h>

#include <rtems/system.h>

#include <rtems/score/object.h>

#include <rtems/posix/semaphore.h>

#include <rtems/posix/time.h>

#include <rtems/posix/seterr.h>

/*PAGE

 *

 *  _POSIX_Semaphore_Wait_support

 */

int _POSIX_Semaphore_Wait_support(

  sem_t              *sem,

  boolean             blocking,

  Watchdog_Interval   timeout

)

{

  register POSIX_Semaphore_Control *the_semaphore;

  Objects_Locations                 location;

  the_semaphore = _POSIX_Semaphore_Get( sem, &location );

  switch ( location ) {

    case OBJECTS_ERROR:

      set_errno_and_return_minus_one( EINVAL );

    case OBJECTS_REMOTE:

      _Thread_Dispatch();

      set_errno_and_return_minus_one( EINVAL );

    case OBJECTS_LOCAL:

      _CORE_semaphore_Seize(

        &the_semaphore->Semaphore,

        the_semaphore->Object.id,

        blocking,

        timeout

      );

      _Thread_Enable_dispatch();

      switch ( _Thread_Executing->Wait.return_code ) {

        case CORE_SEMAPHORE_STATUS_SUCCESSFUL:

          break;

        case CORE_SEMAPHORE_STATUS_UNSATISFIED_NOWAIT:

          set_errno_and_return_minus_one( EAGAIN );

        case CORE_SEMAPHORE_WAS_DELETED:

          set_errno_and_return_minus_one( EAGAIN );

        case CORE_SEMAPHORE_TIMEOUT:

          set_errno_and_return_minus_one( ETIMEDOUT );

          break;

        case CORE_SEMAPHORE_MAXIMUM_COUNT_EXCEEDED:

          /*

           *  This error can not occur since we set the maximum

           *  count to the largest value the count can hold.

           */

          break;

      }

  }

  return 0;

}