Multithreading in c++

Question

I want to run one function with different parameters on different threads:

int threads = 3;
int par1[] = {1, 2, 3};
int par2[] = {4, 5, 6};
for (int i=0; i<threads; i++){
  //new_thread function(par1[i], par2[i]);
}

I know nothing about threads. I tried to do something the windows API (can't use other libraries), but it doesn't work. How should I implement this? And it is possible to start an unknown number of threads of the time of programming (dynamically creating threads)?

Answer 1

One sample example for Windows,

#include <Windows.h>

struct thread_data
{
 int m_id;
 thread_data(int id) : m_id(id) {}
};
DWORD WINAPI thread_func(LPVOID lpParameter)
{
 thread_data *td = (thread_data*)lpParameter;
 cout << "thread with id = " << td->m_id << endl;
 return 0;
}
int main()
{
 for (int i=0; i< 10; i++)
 {
  CreateThread(NULL, 0, thread_func, new thread_data(i) , 0, 0);
 }
}

In this example, each thread gets different data, namely of type thread_data, which is passed as argument to the thread function thread_func().

Read these to know how to create thread on windows:

http://msdn.microsoft.com/en-us/library/ms682516(VS.85).aspx
http://msdn.microsoft.com/en-us/library/ms682453(v=vs.85).aspx

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Also, you may like this suggestion as well:

Better design : define a reusable class!