MyCodeWindows, C++ (vc++)

MyCodeWindows

#include <windows.h>
#include <strsafe.h>
#include <stdio.h>

#define BUF_SIZE 255

//-------------------------------------------------------------------
// A function to Display the message indicating in which tread we are
//-------------------------------------------------------------------
void DisplayMessage (HANDLE hScreen, char *ThreadName, int Data, int Count)
{

TCHAR msgBuf[BUF_SIZE];
    size_t cchStringSize;
    DWORD dwChars;

// Print message using thread-safe functions.
	StringCchPrintf(msgBuf, BUF_SIZE, TEXT("Executing iteration %02d of %s having data = %02d \n"), Count, ThreadName, Data); 
	StringCchLength(msgBuf, BUF_SIZE, &cchStringSize);
	WriteConsole(hScreen, msgBuf, cchStringSize, &dwChars, NULL);
	Sleep(1000);
}

//-------------------------------------------
// A function that represents Thread number 1
//-------------------------------------------
DWORD WINAPI Thread_no_1( LPVOID lpParam ) 
{

int     Data = 0;
	int     count = 0;
    HANDLE  hStdout = NULL;

// Get Handle To screen. Else how will we print?
    if( (hStdout = GetStdHandle(STD_OUTPUT_HANDLE)) == INVALID_HANDLE_VALUE )  
		return 1;

// Cast the parameter to the correct data type passed by callee i.e main() in our case.
    Data = *((int*)lpParam);

for (count = 0; count <= 4; count++ )
	{
		DisplayMessage (hStdout, "Thread_no_1", Data, count);
	}
    
	return 0; 
}

//-------------------------------------------
// A function that represents Thread number 2
//-------------------------------------------
DWORD WINAPI Thread_no_2( LPVOID lpParam ) 
{

int     Data = 0;
	int     count = 0;
    HANDLE  hStdout = NULL;

// Get Handle To screen. Else how will we print?
    if( (hStdout = GetStdHandle(STD_OUTPUT_HANDLE)) == INVALID_HANDLE_VALUE )  
		return 1;
	
    // Cast the parameter to the correct data type passed by callee i.e main() in our case.
    Data = *((int*)lpParam);

for (count = 0; count <= 7; count++ )
	{
		DisplayMessage (hStdout, "Thread_no_2", Data, count);
	}
    
	return 0; 
}

//-------------------------------------------
// A function that represents Thread number 3
//-------------------------------------------
DWORD WINAPI Thread_no_3( LPVOID lpParam ) 
{

int     Data = 0;
	int     count = 0;
    HANDLE  hStdout = NULL;

// Get Handle To screen. Else how will we print?
    if( (hStdout = GetStdHandle(STD_OUTPUT_HANDLE)) == INVALID_HANDLE_VALUE )  
		return 1;

// Cast the parameter to the correct data type passed by callee i.e main() in our case.
    Data = *((int*)lpParam);

for (count = 0; count <= 10; count++ )
	{
		DisplayMessage (hStdout, "Thread_no_3", Data, count);
	}
    
	return 0; 
}

void main()
{

int Data_Of_Thread_1 = 1;            // Data of Thread 1
    int Data_Of_Thread_2 = 2;            // Data of Thread 2
	int Data_Of_Thread_3 = 3;            // Data of Thread 3
	HANDLE Handle_Of_Thread_1 = 0;       // variable to hold handle of Thread 1
	HANDLE Handle_Of_Thread_2 = 0;       // variable to hold handle of Thread 1 
	HANDLE Handle_Of_Thread_3 = 0;       // variable to hold handle of Thread 1
 	HANDLE Array_Of_Thread_Handles[3];   // Aray to store thread handles

// Create thread 1.
    Handle_Of_Thread_1 = CreateThread( NULL, 0, Thread_no_1, &Data_Of_Thread_1, 0, NULL);  
    if ( Handle_Of_Thread_1 == NULL)  ExitProcess(Data_Of_Thread_1);
    
	// Create thread 2.
	Handle_Of_Thread_2 = CreateThread( NULL, 0, Thread_no_2, &Data_Of_Thread_2, 0, NULL);  
    if ( Handle_Of_Thread_2 == NULL)  ExitProcess(Data_Of_Thread_2);
    
	// Create thread 3.
	Handle_Of_Thread_3 = CreateThread( NULL, 0, Thread_no_3, &Data_Of_Thread_3, 0, NULL);  
    if ( Handle_Of_Thread_3 == NULL)  ExitProcess(Data_Of_Thread_3);

// Store Thread handles in Array of Thread Handles as per the requirement of WaitForMultipleObjects() 
	Array_Of_Thread_Handles[0] = Handle_Of_Thread_1;
	Array_Of_Thread_Handles[1] = Handle_Of_Thread_2;
	Array_Of_Thread_Handles[2] = Handle_Of_Thread_3;
    
	// Wait until all threads have terminated.
    WaitForMultipleObjects( 3, Array_Of_Thread_Handles, TRUE, INFINITE);

printf("Since All threads executed lets close their handles \n");

// Close all thread handles upon completion.
    CloseHandle(Handle_Of_Thread_1);
    CloseHandle(Handle_Of_Thread_2);
	CloseHandle(Handle_Of_Thread_3);
}


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