식사하는 철학자

// Chapter06.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"

#include <string>

#include <windows.h>
#include <process.h>

#include <iostream>
using namespace std;

int const MAX_FORK = 5;
int const MAX_PHILOSOPHER = 5;
HANDLE g_forks[ MAX_FORK ];
HANDLE g_room;

void eat( string const & philosopher );
void think( string const & philosopher );
unsigned int WINAPI startDinner( LPVOID param );

int _tmain(int argc, _TCHAR* argv[])
{
 string philo[MAX_PHILOSOPHER] = {"Socrates", "Plato", "Fredeu", "Kant", "Kongja"};
 DWORD threadIDs[MAX_PHILOSOPHER];
 HANDLE threadHandles[ MAX_PHILOSOPHER ];

 for( int i = 0; i < MAX_FORK; ++i )
 {

  g_forks[ i ] = ::CreateSemaphore( NULL, 1, 1, NULL );

 }
 g_room = ::CreateSemaphore( NULL, 4, 4, NULL );

 for(int i =0; i<MAX_PHILOSOPHER; ++i)
 {
  threadHandles[i] = (HANDLE) ::_beginthreadex( NULL, 0 , startDinner,(LPVOID*)(&philo[i]),0,(unsigned int *)&threadIDs[i]);
 }

 DWORD result = ::WaitForMultipleObjects(MAX_PHILOSOPHER, &threadHandles[0],TRUE,INFINITE);
 if(result == WAIT_OBJECT_0)
 {

 }

 for( int i = 0; i < MAX_FORK; ++i )
 {

  ::ReleaseSemaphore(g_forks[i],1,NULL);

 }
 ::ReleaseSemaphore(g_room,1,NULL);

 for(int i = 0; i< MAX_PHILOSOPHER; ++i)
 {
  CloseHandle(threadHandles[i]);
  CloseHandle(g_forks[i]);
 }
 CloseHandle(g_room);

 return 0;
}

void eat( string const & philosopher )
{

 ::Sleep( 100 );
 cout << philosopher+" eat something.\n";
 //printf("%s eat something.\n",philosopher);
}

void think( string const & philosopher )
{

 ::Sleep( 100 );
 cout << philosopher+" think something.\n";
 //printf("%s think something.\n",philosopher);

}

unsigned int WINAPI startDinner( LPVOID param )
{
 string ch = *((string *)param);
 for(int i =0 ; i< MAX_FORK ; i++)
 {

  think(ch);
  DWORD result = ::WaitForSingleObject(g_room,INFINITE);
  DWORD result2 = ::WaitForSingleObject(g_forks[i],INFINITE);
  result2 = ::WaitForSingleObject(g_forks[i+1%5],INFINITE);

  eat(ch);
  ::ReleaseSemaphore(g_forks[i+1%5],1,NULL);
  ::ReleaseSemaphore(g_forks[i],1,NULL);
  ::ReleaseSemaphore(g_room,1,NULL);
 }

 return 0;
}