monitor3.cpp
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/***************************************************************************
* Copyright (C) 2005 by Jeff Ferr *
* root@sat *
* *
* 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 "jmonitor.h"
#include "jthread.h"
#include <stdio.h>
enum GAME_STATE {
START_GAME,
PLAYER_A, // Player A playes the ball
PLAYER_B, // Player B playes the ball
GAME_OVER,
ONE_PLAYER_GONE,
BOTH_PLAYERS_GONE
};
enum GAME_STATE YGameState;
jthread::Monitor YGameStateChange;
class YPlayerA : public jthread::Thread {
public:
virtual void Run()
{
// For access to game state variable
YGameStateChange.Enter();
// Play loop
while ( YGameState < GAME_OVER ) {
// Play the ball
fprintf(stdout, "\nPLAYER-A\n");
//cout << endl << "PLAYER-A" << endl;
// Now its PLAYER-B's turn
YGameState = PLAYER_B;
// Signal to PLAYER-B that now it is his turn
YGameStateChange.NotifyAll();
// Wait until PLAYER-B finishes playing the ball
do {
YGameStateChange.Wait();
if ( PLAYER_B == YGameState )
fprintf(stdout, "\n----PLAYER-A: SPURIOUS WAKEUP!!!\n");
} while ( PLAYER_B == YGameState );
}
// PLAYER-A gone
YGameState = (GAME_STATE)(YGameState+1);
//cout << endl << "PLAYER-A GONE" << endl;
fprintf(stdout, "\nPLAYER-A GONE\n");
// No more access to state variable needed
YGameStateChange.Exit();
// Signal PLAYER-A gone event
YGameStateChange.NotifyAll();
}
};
class YPlayerB : public jthread::Thread {
public:
virtual void Run()
{
// For access to game state variable
YGameStateChange.Enter();
// Play loop
while ( YGameState < GAME_OVER ) {
// Play the ball
//cout << endl << "PLAYER-B" << endl;
fprintf(stdout, "\nPLAYER-B\n");
// Now its PLAYER-A's turn
YGameState = PLAYER_A;
// Signal to PLAYER-A that now it is his turn
YGameStateChange.NotifyAll();
// Wait until PLAYER-A finishes playing the ball
do {
YGameStateChange.Wait();
if ( PLAYER_A == YGameState )
//cout << endl << "----PLAYER-B: SPURIOUS WAKEUP!!!" << endl;
fprintf(stdout, "\n----PLAYER-B: SPURIOUS WAKEUP!!!\n");
} while ( PLAYER_A == YGameState );
}
// PLAYER-B gone
YGameState = (GAME_STATE)(YGameState+1);
//cout << endl << "PLAYER-B GONE" << endl;
fprintf(stdout, "\nPLAYER-B GONE\n");
// No more access to state variable needed
YGameStateChange.Exit();
// Signal PLAYER-B gone event
YGameStateChange.NotifyAll();
}
};
int main()
{
// Set initial state
YGameState = START_GAME;
// Create players
// Create players
jthread::Thread *playerA = new YPlayerA(),
*playerB = new YPlayerB();
playerA->Start();
playerB->Start();
// Give them 5 sec. to play
jthread::Thread::Sleep(5);
// Make some noise
YGameStateChange.Enter();
//cout << endl << "---Noise ON..." << endl;
fprintf(stdout, "\n---Noise ON...\n");
YGameStateChange.Exit();
for ( int i = 0; i < 5000; i++ ) {
YGameStateChange.NotifyAll();
}
//cout << endl << "---Noise OFF" << endl;
fprintf(stdout, "\n---Noise OFF\n");
// Set game over state
YGameStateChange.Enter();
YGameState = GAME_OVER;
// Let them know
YGameStateChange.NotifyAll();
// Wait for players to stop
do {
YGameStateChange.Wait();
} while ( YGameState < BOTH_PLAYERS_GONE );
// Cleanup
//cout << endl << "GAME OVER" << endl;
fprintf(stdout, "\nGAME OVER\n");
YGameStateChange.Exit();
playerA->WaitThread();
playerB->WaitThread();
return 0;
}