proc.h

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/***************************************************************************
 *  $Id: proc.h 212 2008-09-28 17:19:19Z merdmann $
 *
 *  Wed Dec  5 07:07:57 2007
 *  Copyright  2007  Michael Erdmann
 *  Email: michael.erdmann@snafu.de
 ****************************************************************************/

/*
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "typedefs.h"
#include "mkernel_config.h"

#ifndef PROC_H
#define PROC_H

/* process states. */

#define PROC_FREE               0

#define PROC_COMPUTING          1

#define PROC_TERMINATE          2

#define PROC_WAIT_TIMER         3

#define PROC_WAIT_EVENT         4

#define PROC_WAIT_RESOURCE  5

#define PROC_SUSPENDED      6


#define PROC_NOT_EXIST          8

typedef byte t_task_id;

typedef t_task_id TaskType;
typedef TaskType* TaskRefType;

#define LOW_PRIORITY    1
#define NORMAL_PRIORITY 2
#define HIGH_PRIORITY   3

#define DADDR __near byte*

typedef void (*t_task_code)(void*);

#define FULL    1

#define NON             0

typedef struct {
        byte max_activations;
        byte priority;
        byte schedule;
        t_task_code entry;
        POINTER tos;
} t_task_descriptor;



typedef struct {
        POINTER         stack;          
        byte            state;          
        byte            prio;           
        unsigned        event;          
        unsigned        mask;           
        DADDR       wait_addr;  
        byte        activations;
        t_task_descriptor *descriptor;
} t_tcb;


#define ANY_TASK                100             
#define NULL_TASK_ID    101

extern t_tcb _TCB[];
extern const int _os_max_tcb;

#define STACK_SIZE_KERNEL   150

extern void Schedule( void );
extern void _os_yield(void);                    /* see yield.i */


typedef void* TASK_ARGUMENT;

/*
 * This method is used by the system generator to create a task
 * instance.
 */
StatusType _os_task_create( t_task_id id, t_task_descriptor *descr );

StatusType _os_task_switch( t_task_id id );

extern POINTER _os_kernel_stack;
extern t_tcb *_os_current_task;
extern byte _os_mode;                                   /* will be set by the interrupt handlers */

#endif

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