[tor-bugs] #14209 [Core Tor/Tor]: Implement new option SocksNamedPipe for Windows users

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#14209: Implement new option SocksNamedPipe for Windows users
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 Reporter:  anon          |          Owner:
     Type:  enhancement   |         Status:  new
 Priority:  Medium        |      Milestone:  Tor: 0.2.???
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:  tor-client    |  Actual Points:
Parent ID:                |         Points:
 Reviewer:                |        Sponsor:
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Changes (by xeonchen):

 * severity:   => Normal


Comment:

 per nickm:

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 I'd suggest an extra thread and event loop to process Windows handles.
 You'll need to communicate with the main thread; look at workqueue.c
 to get some idea of how we do that now, though you'd probably want a
 different implementation.  Avoid sharing structures whenever possible.
 To keep as much shared implementation as possible, you might do it like
 this:
 * enable threadsafe mode when initializing libevent.
 * Add handle-based versions of read_to_buf / flush_buf. Use them as
 appropriate.
 * Allow a connection_t to optionally have a handle instead of a socket.
 * When constructing the event objects for the handle, do not pass in a
 file descriptor. Instead, pass a file descriptor of -1.
 * From the worker thread, use event_active() to make those event objects
 active when the handles are ready for read/write. (This is why libevent
 needs to be running with thread safety enabled.)
 * Now all you'll need is some way for the main thread to tell the worker
 thread about new handles, closed handles, and which of the handles should
 be reading/writing.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14209#comment:4>
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