[Twisted-Python] WaitForMultipleObjects socket limitation

[Glyph Lefkowitz]

On Apr 7, 2011, at 12:16 PM, anatoly techtonik wrote:

> I've made a proof of concept for asynchronous console input on Windows
> [1] and now I am trying to understand the limits of
> WaitForMultipleObjects API I've used.
> 
> Documentation on win32eventreactor mentions limit for 64 objects:
> http://twistedmatrix.com/documents/11.0.0/api/twisted.internet.win32eventreactor.htm
> However, it is completely opaque what these objects are? For console
> handles and process handles it is quite obvious, but not for sockets.
> 
> Is 64 the limit for total amount sockets opened on different ports?
> Is 64 the limit for connections made to a socket on specified port?
> 
> 1. http://techtonik.rainforce.org/2011/03/asynchronous-input-from-windows-console.html

64 is the limit for the total number of objects (listening ports, connections to a port, client connections, your console, the waker, serial ports, whatever) that WFMO may wait upon at once.

Put another way, MAXIMUM_WAIT_OBJECTS=64: http://msdn.microsoft.com/en-us/library/ms687025(v=vs.85).aspx