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/*

 *  CORE Semaphore Handler

 *

 *  DESCRIPTION:

 *

 *  This package is the implementation of the CORE Semaphore Handler.

 *  This core object utilizes standard Dijkstra counting semaphores to provide

 *  synchronization and mutual exclusion capabilities.

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: coresem.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/isr.h>

#include <rtems/score/coresem.h>

#include <rtems/score/states.h>

#include <rtems/score/thread.h>

#include <rtems/score/threadq.h>

#if defined(RTEMS_MULTIPROCESSING)

#include <rtems/score/mpci.h>

#endif

/*PAGE

 *

 *  CORE_semaphore_Initialize

 *

 *  This function initialize a semaphore and sets the initial value based

 *  on the given count.

 *

 *  Input parameters:

 *    the_semaphore            - the semaphore control block to initialize

 *    the_class                - the API class of the object

 *    the_semaphore_attributes - the attributes specified at create time

 *    initial_value            - semaphore's initial value

 *    proxy_extract_callout    - MP specific extract callout

 *

 *  Output parameters:  NONE

 */

void _CORE_semaphore_Initialize(

  CORE_semaphore_Control       *the_semaphore,

  Objects_Classes               the_class,

  CORE_semaphore_Attributes    *the_semaphore_attributes,

  unsigned32                    initial_value,

  Thread_queue_Extract_callout  proxy_extract_callout

)

{

  the_semaphore->Attributes = *the_semaphore_attributes;

  the_semaphore->count      = initial_value;

  _Thread_queue_Initialize(

    &the_semaphore->Wait_queue,

    the_class,

    _CORE_semaphore_Is_priority( the_semaphore_attributes ) ?

              THREAD_QUEUE_DISCIPLINE_PRIORITY : THREAD_QUEUE_DISCIPLINE_FIFO,

    STATES_WAITING_FOR_SEMAPHORE,

    proxy_extract_callout,

    CORE_SEMAPHORE_TIMEOUT

  );

}