/*
                             *******************
******************************* C HEADER FILE *******************************
**                           *******************                           **
**                                                                         **
** project      : The C Kernel                                             ** 
** filename     : CKSEMA.H                                                 **
** version      : 2                                                        **
** last revised : August 22, 2004                                          **
**                                                                         **
*****************************************************************************
**                                                                         **
** Copyright (c) 1998-2004, P.K. van der Vlugt                             **
** All rights reserved.                                                    **
**                                                                         **
*****************************************************************************

Semaphore Resource module.

VERSION HISTORY:
----------------

Version     : 1
Date        : June 01, 2003
Revised by  : P.K. van der Vlugt
Description : Original version

Version     : 2
Date        : August 22, 2004
Revised by  : P.K. van der Vlugt
Description : * Changed module name to comply to new kernel module naming 
                convention.

*/

#ifndef _CKSEMA_INCLUDED
#define _CKSEMA_INCLUDED

/****************************************************************************/
/**                                                                        **/
/**                     MODULES USED                                       **/
/**                                                                        **/
/****************************************************************************/

#include "ckconfig.h"

/****************************************************************************/
/**                                                                        **/
/**                     DEFINITIONS AND MACROS                             **/
/**                                                                        **/
/****************************************************************************/

/****************************************************************************/
/**                                                                        **/
/**                     TYPEDEFS AND STRUCTURES                            **/
/**                                                                        **/
/****************************************************************************/

typedef struct
{
  bool   req;
  int16s count;
  int8u  qid;
  int8u  mode;
}
SemaType;

/****************************************************************************/
/**                                                                        **/
/**                     EXPORTED VARIABLES                                 **/
/**                                                                        **/
/****************************************************************************/

#ifndef _CKSEMA_C_SRC

#if NR_OF_SEMAS > 0
extern SemaType Sema[NR_OF_SEMAS];
#endif

#endif

/****************************************************************************/
/**                                                                        **/
/**                     EXPORTED FUNCTIONS                                 **/
/**                                                                        **/
/****************************************************************************/

/****************************************************************************/
void SemaInit (void);
/****************************************************************************/
/*
 * Initializes all resources in this module. This function must be called
 * before any other functions of this module are used.
 */

/****************************************************************************/
int8u SemaAlloc (void);
/****************************************************************************/
/*
 * This function requests one of the available resources. If a resource
 * is available, the resource id will be returned. If there are no more
 * resources avaliable, NR_OF_SEMAS will be returned to indicate the
 * error situation. Other errors also return NR_OF_SEMAS.
 */

/****************************************************************************/
void SemaFree (int8u id);
/****************************************************************************/
/*
 * This function releases the specified resource id when it is a valid id. 
 * The resource is set back to the initial state. The associated resource 
 * (task queue) is also released.
 */

#endif

/****************************************************************************/
/**                                                                        **/
/**                               EOF                                      **/
/**                                                                        **/
/****************************************************************************/