[xorg-bugzilla-noise] [Bug 808] New: Xt: XtAppAddInput additional input sometimes ignored in multi-threaded application

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http://freedesktop.org/bugzilla/show_bug.cgi?id=808   
   
           Summary: Xt: XtAppAddInput additional input sometimes ignored in
                    multi-threaded application
           Product: xorg
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Lib/Xt
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: luik at orthogon.de


The X Toolkit does not call the callback function registered with
XtAppAddInput when there is some input pending on the registered file
descriptor, unless an X event has recently been processed.  This can
easily been reproduced with the attached test program.

The program consists of three threads:

- main thread: initialization, makes a pipe, registers the pipe[0] fd
as additional input, creates two other threads and runs the X Toolkit
main loop (XtAppNextEvent and XtDispatchEvent).

- WorkThread: endless loop, which calls XQueryTree and then sleeps for
three seconds.

- SignalWaiterThread: handles SIGINT signal using sigwait(), and
writes to pipe[1] when a signal has arrived.

When SIGINT is catched, the input callback for pipe[0] should be
called, but most of the time, it is not.  You can enforce the callback
to be called by generating an X event, e.g. by using the command
"xmodmap -e 'pointer = default'".   
   
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