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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"
#include "tinsel/events.h"
#include "tinsel/tinsel.h"
namespace Tinsel {
// the size of process specific info
#define PARAM_SIZE 32
// the maximum number of processes
#define NUM_PROCESS (TinselV2 ? 70 : 64)
#define MAX_PROCESSES 70
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);
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
//----------------- FUNCTION PROTOTYPES --------------------
void SceneProcesses(uint32 numProcess, SCNHANDLE hProcess);
void CallSceneProcess(uint32 procID);
void KillSceneProcess(uint32 procID);
void SceneProcessEvent(CORO_PARAM, uint32 procID, TINSEL_EVENT event, bool bWait,
int myEscape, bool *result = NULL);
void RestoreSceneProcess(INT_CONTEXT *pic);
void GlobalProcesses(uint32 numProcess, byte *pProcess);
void xCallGlobalProcess(uint32 procID);
void xKillGlobalProcess(uint32 procID);
bool GlobalProcessEvent(CORO_PARAM, uint32 procID, TINSEL_EVENT event, bool bWait, int myEscape);
void RestoreGlobalProcess(INT_CONTEXT *pic);
void KillGlobalProcesses(void);
void FreeGlobalProcesses();
} // End of namespace Tinsel
#endif // TINSEL_SCHED_H
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