Programação Multithread em C (windows)

 
/*
Exemplo de programação multithread em C:
dá para saber o que é um thread sincronico e assincronico.. teste
*/

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

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

    while ( Counter < 1000000 )
        Counter++;
  
 //printf("Counter=%d\n",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.
    // Serve para a sincronização do thread ao programa principal.
    WaitForSingleObject( hThread, INFINITE );
    
    
    printf( "Counter should be 1000000; it is-> %d\n", Counter );
    
    // Destroy the thread object.
    CloseHandle( hThread );
    
    system("pause");
}

fonte: Documentação offline do Visual Studio.