How to use mutexs and processes? - c++

Question

I have the "philosophers problem" to do, I need to use mutex as the lock (sticks) and five different proccesses to represent the philosofers, But I faced a few problems.
I dont know if the mutexes need to be in the file where I creates the proccesses and send them to the .exe that feed each philosofer with the given sticks, or in the .exe file where I feed the philosofers like I did with the switch case condition.
I dont know how do I send the parameters (philosofer number / mutexes) or more then one parameter to the main function in the .exe file.
UPDATED MY CODE!!
this is the main I run and create processes:
#include <iostream>
#include <windows.h>
HANDLE stick1;
HANDLE stick2;
HANDLE stick3;
HANDLE stick4;
HANDLE stick5;
int main()
{
stick1 = CreateMutexA(NULL, FALSE, "stick1");
stick1 = CreateMutexA(NULL, FALSE, "stick2");
stick1 = CreateMutexA(NULL, FALSE, "stick3");
stick1 = CreateMutexA(NULL, FALSE, "stick4");
stick1 = CreateMutexA(NULL, FALSE, "stick5");
LPSTR cmdArgs1 = const_cast <char*>("mutex.exe 1");
LPSTR cmdArgs2 = const_cast <char*>("mutex.exe 2");
LPSTR cmdArgs3 = const_cast <char*>("mutex.exe 3");
LPSTR cmdArgs4 = const_cast <char*>("mutex.exe 4");
LPSTR cmdArgs5 = const_cast <char*>("mutex.exe 5");
STARTUPINFOA si1;
STARTUPINFOA si2;
STARTUPINFOA si3;
STARTUPINFOA si4;
STARTUPINFOA si5;
PROCESS_INFORMATION pi1;
PROCESS_INFORMATION pi2;
PROCESS_INFORMATION pi3;
PROCESS_INFORMATION pi4;
PROCESS_INFORMATION pi5;
ZeroMemory(&si1, sizeof(si1));
si1.cb = sizeof(si1);
ZeroMemory(&pi1, sizeof(pi1));
ZeroMemory(&si2, sizeof(si2));
si2.cb = sizeof(si2);
ZeroMemory(&pi2, sizeof(pi2));
ZeroMemory(&si3, sizeof(si3));
si3.cb = sizeof(si3);
ZeroMemory(&pi3, sizeof(pi3));
ZeroMemory(&si4, sizeof(si4));
si4.cb = sizeof(si4);
ZeroMemory(&pi4, sizeof(pi4));
ZeroMemory(&si5, sizeof(si5));
si5.cb = sizeof(si5);
ZeroMemory(&pi5, sizeof(pi5));
BOOL p1 = CreateProcessA(NULL, cmdArgs1, NULL, NULL, FALSE, 0, NULL, NULL, &si1, &pi1);
BOOL p2 = CreateProcessA(NULL, cmdArgs2, NULL, NULL, FALSE, 0, NULL, NULL, &si2, &pi2);
BOOL p3 = CreateProcessA(NULL, cmdArgs3, NULL, NULL, FALSE, 0, NULL, NULL, &si3, &pi3);
BOOL p4 = CreateProcessA(NULL, cmdArgs4, NULL, NULL, FALSE, 0, NULL, NULL, &si4, &pi4);
BOOL p5 = CreateProcessA(NULL, cmdArgs5, NULL, NULL, FALSE, 0, NULL, NULL, &si5, &pi5);
if (p1 && p2 && p3 && p4 && p5)
{
WaitForSingleObject(pi1.hProcess, INFINITE);
WaitForSingleObject(pi2.hProcess, INFINITE);
WaitForSingleObject(pi3.hProcess, INFINITE);
WaitForSingleObject(pi4.hProcess, INFINITE);
WaitForSingleObject(pi5.hProcess, INFINITE);
CloseHandle(pi1.hProcess);
CloseHandle(pi1.hThread);
CloseHandle(pi2.hProcess);
CloseHandle(pi2.hThread);
CloseHandle(pi3.hProcess);
CloseHandle(pi3.hThread);
CloseHandle(pi4.hProcess);
CloseHandle(pi4.hThread);
CloseHandle(pi5.hProcess);
CloseHandle(pi5.hThread);
}
}
and this is the .exe file:
#include <iostream>
#include <windows.h>
#include <chrono>
#define TIMES_TO_EAT 1000000
#pragma warning(disable : 4996)
int main(int argc, char* argv[])
{
HANDLE rightStick;
HANDLE leftStick;
int i = 0;
char id = argv[1][0]; // supposed to be the number of the philosofer
char rightS[] = "stick";
char leftS[] = "stick";
char leftStickCalc = (char)((int)id - 1);
if (id == '1')
{
leftStickCalc = '5';
}
strncat(rightS, &id, 1);
strncat(leftS, &leftStickCalc, 1);
auto start = std::chrono::system_clock::now();
while (i < TIMES_TO_EAT)
{
rightStick = OpenMutexA(MUTEX_ALL_ACCESS, FALSE, LPSTR(rightS));
if (rightStick != NULL)
{
leftStick = OpenMutexA(MUTEX_ALL_ACCESS, FALSE, LPSTR(leftS));
if (leftStick != NULL)
{
i++;
ReleaseMutex(rightStick);
ReleaseMutex(leftStick);
if (i == TIMES_TO_EAT)
{
CloseHandle(rightStick);
CloseHandle(leftStick);
}
}
else
{
ReleaseMutex(rightStick);
}
}
}
auto end = std::chrono::system_clock::now();
std::chrono::duration<double> time = end - start;
printf("philosopher %c finished eat %d times in %.2f seconds\n", id, i, time.count());
system("PAUSE");
return 0;
}