🚀 go-pugleaf

In article <1992Sep30.130539.12174@ghost.dsi.unimi.it> rizzi@ghost.dsi.unimi.it (daniele rizzi) writes:
>
>
>Hi all,
>I'm trying to build an application with two concurrent c_threads, the former
> managing the windows, the latter working with the DSP56.
>I would like that the secondary thread shows the result of its computation
>to the main window, so in the 'c' code I have inserted the method:
>
>[form setIntValue:the_result];
>
>at runtime, sometimes the program crashes with 'Unlock the Wrong View' message
>and various DPS-errors. Why?

Doing anything with the windowserver from any thread other than the
main one can cause weird things to happen --- only send messages to
AppKit objects and do things with the windowserver from the main
thread.

A solution is to either use conditions or muticies to signal the
main-thread that it's time to display a certain shared variable or
pass mach-messages to the main thread.  Check out the Sorting in
Action miniexample for details on using speaker-listener.


andrew
-- 
andrew@cubetech.com     | "We shall not cease from exploration
Andrew Loewenstern      |  And the end of our exploring
Cube Technologies, Inc. |  Will be to arrive where we started
                        |  And know the place for the first time." -T.S. Eliot