/// Find all errors

#include <windows.h>
#include <process.h>

/// Critical section guard
/// Closes critical section at the end of the visibility scope
class CSGuard
{
private:
    /// Controled critical section
    CRITICAL_SECTION* cs_;

public:
    /// Constructor
    /// Locks critical section
    CSGuard( CRITICAL_SECTION* cs )
        : cs_( cs )
    {
        EnterCriticalSection( cs_ );
    }

    /// Destructor
    /// Unlocks critical section
    ~CSGuard()
    {
        LeaveCriticalSection( cs_ );
    }
};

/// Performs some background work
class SomeClass
{
private:
    /// Critical section
    CRITICAL_SECTION cs_;

    /// Thread descriptor
    HANDLE thread_;

    /// Stop falg
    volatile bool exit_;


public:
    /// Constructor
    SomeClass()
        : thread_( NULL )
    {
        InitializeCriticalSection( &cs_ );
        thread_ = reinterpret_cast<HANDLE>( _beginthread( &thread_func, 0, this ) );
    }

    /// Destructor
    ~SomeClass()
    {
        stop();
        DeleteCriticalSection( &cs_ );
    }

private:

    /// Stops background task and wait until task is terminated
    void stop()
    {
        CSGuard g( &cs_ );
        exit_ = true;
        WaitForSingleObject( thread_, INFINITE );
    }

    /// Background task
    static void thread_func( void* args )
    {
        SomeClass* p_this = reinterpret_cast< SomeClass* >( args );
        
        for( ;; ) // infinite loop
        {
            {
                CSGuard g( &p_this->cs_ );
                if( p_this->exit_ )
                    break;
            }

            Sleep( 100 ); // do some work
        }
    }
};


/// Test
int main()
{
    SomeClass sc;
    return 0;
}