使用及关闭线程

-(void)startRtsp{
    
    //    [self performSelectorInBackground:@selector(lanzado) withObject:nil];
    thread = [[NSThread alloc]initWithTarget:self selector:@selector(lanzado) object:nil];
    [thread start];
    
}

-(void)stopRtsp{

    [session teardown];
    
    
    [thread cancel];
    
    if ([[NSThread currentThread] isCancelled]) {
                                //clean up 
        [NSThread exit];
    }
    

}