bug#18848: hang is in [EmacsApp run] (24.4.51; Hang after toolbar use)

[David Reitter]

The hang occurs in the “run” method (of EmacsApp), specifically this function 
call:

        NSEvent *event =
          [self nextEventMatchingMask:NSAnyEventMask
                            untilDate:[NSDate distantFuture]
                               inMode:NSDefaultRunLoopMode
                              dequeue:YES];

does not appear to return.

I have tried using [NSDate dateWithTimeIntervalSinceNow:2], but that doesn’t 
work either.


> On Oct 27, 2014, at 8:40 PM, David Reitter <david.reitter@gmail.com> wrote:
> 
> interrupt_input_blocked is often 0 when the hang occurs, but I noticed some 
> strange conditions when interrupting a non-hanging Emacs:
> 
> (lldb) print interrupt_input_blocked
> (int) $9 = -1
> 
> or interrupt_input_blocked has a nonsensical value:
> 
> (lldb) print interrupt_input_blocked
> (int) $3 = 1157628088
> 
> I have tried placing a warning in unblock_input() to notify of negative 
> values for interrupt_input_blocked, but that didn’t lead to anything in 
> conjunction with the toolbar double-click.
> 
> So maybe this is all a red herring.