semaphores in visual C++ [closed] - c++-cli

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Closed 10 years ago.
I am a new CLI learning. I need to modify a program to print out specific sequence. Please give me some guidelines. It is a Homework, I do NOT want people give me the answer. I really only want some guidelines.
I need to modify a given code using semaphores to print out this sequence AA/111\BA/356\YZ/654\JK/257\HG/445\…….
I am giving the following code
#include "stdafx.h"
using namespace System;
using namespace System::Threading;
ref class PrintTasks
{
public: static bool runFlag = true;
public:
void PrintDigit(Object^ name) {
while (runFlag) {
Console::WriteLine((String^)name);
}
}
void PrintLetter(Object^ name) {
while (runFlag) {
Console::WriteLine((String^)name);
}
}
void PrintSlashes(Object^ name) {
while (runFlag) {
Console::WriteLine("/");
Console::WriteLine("\\");
}
}
};
int main(array<System::String ^> ^args)
{
PrintTasks ^tasks = gcnew PrintTasks();
array<Thread^> ^threads = gcnew array<Thread^>(37);
// create 10 digit threads
for (int d=0; d<10; d++) {
threads[d] = gcnew Thread ( gcnew ParameterizedThreadStart( tasks, &PrintTasks::PrintDigit ) );
threads[d]->Start(d.ToString());
}
// create 26 letter threads
for (wchar_t d='A'; d<='Z'; d++) {
threads[10+d-'A'] = gcnew Thread ( gcnew ParameterizedThreadStart( tasks, &PrintTasks::PrintLetter ) );
threads[10+d-'A']->Start(d.ToString());
}
// create the slash thread
threads[36] = gcnew Thread ( gcnew ParameterizedThreadStart( tasks, &PrintTasks::PrintSlashes ) );
threads[36]->Start("");
// Let the threads to run for a period of time
Thread::Sleep(1000);
PrintTasks::runFlag=false;
// Aabort the threads
for (int i=0; i<37; i++) threads[i]->Abort();
return 0;
}
I did modification the code and the following is my version. One thing which I don't understand is the digit threads are created by a for-loop, the for-loop has to run completely in order to run the letter thread. Am I right?
// ThreadSync.cpp : main project file.
#include "stdafx.h"
using namespace System;
using namespace System::Threading;
ref class PrintTasks
{
public: static bool runFlag = true;
public:
void PrintDigit(Object^ name) {
while (runFlag) {
Console::WriteLine((String^)name);
my_Semaphore1->WaitOne();
}
}
void PrintLetter(Object^ name) {
while (runFlag) {
Console::WriteLine((String^)name);
my_Semaphore2->WaitOne();
}
}
void PrintSlashes(Object^ name) {
while (runFlag) {
Console::WriteLine("/");
my_Semaphore1->Release();
my_Semaphore1->Release();
Console::WriteLine("\\");
my_Semaphore2->Release();
my_Semaphore2->Release();
my_Semaphore2->Release();
}
}
private: static Semaphore ^my_Semaphore1;
private: static Semaphore ^my_Semaphore2;
};
int main(array<System::String ^> ^args)
{
Semaphore ^my_Semaphore1 = gcnew Semaphore(0,2);
Semaphore ^my_Semaphore2 = gcnew Semaphore(0,3);
PrintTasks ^tasks = gcnew PrintTasks();
array<Thread^> ^threads = gcnew array<Thread^>(37);
// create 10 digit threads
for (int d=0; d<10; d++) {
threads[d] = gcnew Thread ( gcnew ParameterizedThreadStart( tasks, &PrintTasks::PrintDigit ) );
threads[d]->Start(d.ToString());
}
// create 26 letter threads
for (wchar_t d='A'; d<='Z'; d++) {
threads[10+d-'A'] = gcnew Thread ( gcnew ParameterizedThreadStart( tasks, &PrintTasks::PrintLetter ) );
threads[10+d-'A']->Start(d.ToString());
}
// create the slash thread
threads[36] = gcnew Thread ( gcnew ParameterizedThreadStart( tasks, &PrintTasks::PrintSlashes ) );
threads[36]->Start("");
// Let the threads to run for a period of time
Thread::Sleep(1000);
PrintTasks::runFlag=false;
// Aabort the threads
for (int i=0; i<37; i++) threads[i]->Abort();
return 0;
}