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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
* Data structures used by the process scheduler
*/
#ifndef TINSEL_SCHED_H // prevent multiple includes
#define TINSEL_SCHED_H
#include "tinsel/dw.h" // new data types
#include "tinsel/coroutine.h"
namespace Tinsel {
// the size of process specific info
#define PARAM_SIZE 32
// the maximum number of processes
#define NUM_PROCESS 64
typedef void (*CORO_ADDR)(CoroContext &);
// process structure
struct PROCESS {
PROCESS *pNext; // pointer to next process in active or free list
CoroContext state; // the state of the coroutine
CORO_ADDR coroAddr; // the entry point of the coroutine
int sleepTime; // number of scheduler cycles to sleep
int pid; // process ID
char param[PARAM_SIZE]; // process specific info
};
/*----------------------------------------------------------------------*\
|* Scheduler Function Prototypes *|
\*----------------------------------------------------------------------*/
void InitScheduler(void); // called to init scheduler - kills all processes and places them on free list
void FreeProcessList(void);
#ifdef DEBUG
void ProcessStats(void); // Shows the maximum number of process used at once
#endif
void Scheduler(void); // called to start process dispatching
PROCESS *ProcessCreate(int pid, CORO_ADDR coroAddr, const void *pParam, int sizeParam);
void ProcessKill( // kill a process
PROCESS *pKillProc); // which process to kill (must be different from current one)
PROCESS *CurrentProcess(void); // Returns a pointer to the currently running process
int ProcessGetPID( // Returns the process identifier of the specified process
PROCESS *pProc); // which process
char *ProcessGetParamsSelf();
int KillMatchingProcess( // kill any process matching the pid parameters
int pidKill, // process identifier of process to kill
int pidMask); // mask to apply to process identifiers before comparison
// Pointer to a function of the form "void function(PPROCESS)"
typedef void (*VFPTRPP)(PROCESS *);
void SetResourceCallback(VFPTRPP pFunc); // May be called by a resource allocator,
// the function supplied is called by ProcessKill()
// to allow the resource allocator to free resources
// allocated to the dying process.
} // end of namespace Tinsel
#endif // TINSEL_SCHED_H
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