title: WinAPI - Synchronizing SwapBuffers
body: <p>Is it possible to synchronize SwapBuffers in many threads? When I try to turn on vertical synchronization (wglSwapIntervalEXT), it stops all threads, until it doesn't do tick (ex. when I open 3 windows, every window has approximately 20 frames [60/3] ) 
  Every window has separate thread, and of course every thread has his own SwapBuffer function.</p>