Question

I want to perform the operation stated above.

void myFunc(void *parameters)
{
   myObject myObj = // Here I would like to receive the object I passed from the main

   ... // several stuff
}

...

int main()
{
   ...
    myObject myObj(...);
   _beginthread(myFunc, // Here I would like to pass on the object I created above)
   ...
}

Thanks in advance for your time. Have a pleasent day !

Answer 1

Directly from Microsoft’s documentation of _beginthreadex:

// crt_begthrdex.cpp
// compile with: /MT
#include <windows.h>
#include <stdio.h>
#include <process.h>

int Counter; 
unsigned __stdcall SecondThreadFunc( void* pArguments )
{
    printf( "In second thread...\n" );

    while ( Counter < 1000000 )
        Counter++;

    _endthreadex( 0 );
    return 0;
} 

int main()
{ 
    HANDLE hThread;
    unsigned threadID;

    printf( "Creating second thread...\n" );

    // Create the second thread.
    hThread = (HANDLE)_beginthreadex( NULL, 0, &SecondThreadFunc, NULL, 0, &threadID );

    // Wait until second thread terminates. If you comment out the line
    // below, Counter will not be correct because the thread has not
    // terminated, and Counter most likely has not been incremented to
    // 1000000 yet.
    WaitForSingleObject( hThread, INFINITE );
    printf( "Counter should be 1000000; it is-> %d\n", Counter );
    // Destroy the thread object.
    CloseHandle( hThread );
}

UPDATE: How to use the argument without global variables.

#include <iostream>
#include <process.h>

using namespace std;

void myFunction( void* arg){

     MyObject myObj = *(MyObject*)arg;

     // do something with your object

     _endthread();

}

int main(int argc, char *argv[])
{
    MyObject myObj(/*...*/);

    _beginthread( myFunction, 0, (void*)&myObj);

    // You can also use the example above for hints on how
    // to wait for the thread to terminate before exiting
    // your application.
    return 0;
}

HINT: replace the int with your object