use windows::{core::Result,
              Win32::System::Threading::
              {CreateThreadpoolWork,SubmitThreadpoolWork,WaitForThreadpoolWorkCallbacks,PTP_CALLBACK_INSTANCE,PTP_WORK}
};

static COUNTER: std::sync::RwLock<i32> = std::sync::RwLock::new(0);

fn main()-> Result<()> {
    unsafe {
        let work = CreateThreadpoolWork(Some(callback), None, None)?;
        for _ in 0..10{
            SubmitThreadpoolWork(work);
        }
        WaitForThreadpoolWorkCallbacks(work,false);
    }
    let counter = COUNTER.write().unwrap();
    println!("Counter : {}",*counter);
    Ok(())
}


extern "system" fn callback(_:PTP_CALLBACK_INSTANCE, _: *mut std::ffi::c_void,_: PTP_WORK){
    let mut counter = COUNTER.write().unwrap();
    *counter += 1
}