# To subscribers of the xforms list from Jeff Pierce <wd4nmq@comcast.net> :
I have an xforms app that accesses a server to get a users list that is
displayed in a browser object.
Ok, I have had it working for along time, but while the server is being
accessed and the data fed into the browser object, all other objects
freeze because of the single threaded design. Ok, lets do the serve
access as a thread.
Which I do using the pthread library. I test out threaded code in a
non-xforms app and it runs fine.
But, in the xforms app a weird thing happens.
I start the app and press the button to go get the server data. Heres a
flow of what the code does.
1. deactivate the browser object to keep users from clicking in it.
2. Change browser object background color to let user know it is
updating.
3. Tell the thread to go get the data.
4. At this point the button callback ends and xforms should return to
it's event handler ready fo another event.
5. In the thread, after it has downloaded and sorted the data, it puts
the data in the browser, changes the background color to normal and
activates the browser object.
Now here's the problem, sometimes it works perfectly. I hit the update
button, the browser color changes and debug messages I have in the
thread are printed. I can click on other input objects and the cursor
goes there while the server thread is doing it's thing. Just what I wanted.
But, most of the time, while the server is being accessed the clicked on
object does NOT get the cursor, and when the server access completes,
the browser data is filled in, etc, the app crashes with this error:
X Error of failed request: BadWindow (invalid Window parameter)
Major opcode of failed request: 38 (X_QueryPointer)
Resource id in failed request: 0x20000d1
Serial number of failed request: 173187
Current serial number in output stream: 173187
Like I said sometimes it works fine, but most of the time I get this
failure.
-- Jeff, wd4nmq wd4nmq@comcast.net http://mywebpages.comcast.net/wd4nmq_________________________________________________ To unsubscribe, send the message "unsubscribe" to xforms-request@bob.usuhs.mil or see http://bob.usuhs.mil/mailserv/xforms.html XForms Home Page: http://world.std.com/~xforms List Archive: http://bob.usuhs.mil/mailserv/list-archives/ Development: http://savannah.nongnu.org/files/?group=xforms
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