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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.
*
* Data structures used by the process scheduler
*/
#ifndef TONY_SCHED_H
#define TONY_SCHED_H
#include "tony/coroutine.h"
namespace Tony {
// the size of process specific info
#define PARAM_SIZE 32
// the maximum number of processes
#define NUM_PROCESS 100
#define MAX_PROCESSES 100
typedef void (*CORO_ADDR)(CoroContext &, const void *);
/** process structure */
struct PROCESS {
PROCESS *pNext; ///< pointer to next process in active or free list
PROCESS *pPrevious; ///< pointer to previous 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
};
typedef PROCESS *PPROCESS;
struct INT_CONTEXT;
/**
* Create and manage "processes" (really coroutines).
*/
class Scheduler {
public:
/** Pointer to a function of the form "void function(PPROCESS)" */
typedef void (*VFPTRPP)(PROCESS *);
private:
/** list of all processes */
PROCESS *processList;
/** active process list - also saves scheduler state */
PROCESS *active;
/** pointer to free process list */
PROCESS *pFreeProcesses;
/** the currently active process */
PROCESS *pCurrent;
#ifdef DEBUG
// diagnostic process counters
int numProcs;
int maxProcs;
void CheckStack();
#endif
/**
* Called from killProcess() to enable other resources
* a process may be allocated to be released.
*/
VFPTRPP pRCfunction;
public:
Scheduler();
~Scheduler();
void reset();
#ifdef DEBUG
void printStats();
#endif
void schedule();
void rescheduleAll();
void reschedule(PPROCESS pReSchedProc = NULL);
void giveWay(PPROCESS pReSchedProc = NULL);
PROCESS *createProcess(int pid, CORO_ADDR coroAddr, const void *pParam, int sizeParam);
PROCESS *createProcess(CORO_ADDR coroAddr, const void *pParam) {
return createProcess(0, coroAddr, &pParam, sizeof(void *));
}
void killProcess(PROCESS *pKillProc);
PROCESS *getCurrentProcess();
int getCurrentPID() const;
int killMatchingProcess(int pidKill, int pidMask = -1);
void setResourceCallback(VFPTRPP pFunc);
};
extern Scheduler *g_scheduler; // FIXME: Temporary global var, to be used until everything has been OOifyied
} // End of namespace Tony
#endif // TONY_SCHED_H
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