Thanks to Keith, this problem's solution has been found (and a hairy one
it is! :) ).
Certain OSv3.5 versions hold the memory semaphore during notifications.
Bottom line: POSE can't do anything, and certain real devices crash if
you have an event loop inside a notification routine.
Here's what I did to "solve" the problem (note that I've not fully
researched the case of when MemSemaphoreRelease returns false):
In the event handler:
ud->sema_bug = (os_version() == 0x305);
if (ud->sema_bug) {
if (MemSemaphoreRelease(false))
ud->sema_bug = false; /*
don't re-reserve it. This ROM isn't bad. */
}
Do our logic
.
.
.
if (ud->sema_bug)
MemSemaphoreReserve(false);
Note: The os_version() routine's result is 0x305 in the case of
PalmOSv3.5, 0x400 in PalmOSv4.0, and 0x401 for PalmOSv4.1.
Good luck!
Alex
Thomas Ward wrote:
>
> Hi,
>
> I have an app compiled with GCC that uses the sysAppLaunchCmdNotify launch
> code with sysNotifyLateWakeupEvent. It works correctly except when running
> POSE with OS 3.5.2H. When I get sysNotifyLateWakeupEvent, I end up calling
> this routine:
>
> static void message_dialog (void) {
> FormPtr dialog = FrmInitForm(message_form);
> EventType event;
>
> FrmSetEventHandler(dialog, (FormEventHandlerPtr) message_handler);
>
> MemSet(&event, sizeof(EventType), 0);
> event.eType = frmOpenEvent;
> event.data.frmLoad.formID = message_form;
> EvtAddEventToQueue(&event);
>
> FrmDoDialog(dialog);
> FrmDeleteForm(dialog);
> }
>
> The message_handler routine looks basically like this:
>
> static Boolean message_handler (EventPtr event) {
> FormPtr frm = FrmGetActiveForm();
> Boolean handled = false;
>
> HostTraceOutputTL(appErrorClass, "got event");
> switch (event->eType) {
> case ctlSelectEvent:
> // handle controls here
> break;
> case frmOpenEvent:
> show_message(frm); // does a FrmDrawForm
> HostTraceOutputTL(appErrorClass, "finished");
> handled = true;
> break;
> }
> return handled;
> }
>
> When this runs in POSE with the Visor35Dbg.rom ROM file on a Win2k machine,
> I turn off the power, turn it back on, and get:
>
> got event
> got event
> got event
> finished
>
> my form appears, and everything seems to be OK. But, at this point, it's
> dead. I cannot tap on any buttons or do anything other than exit or reset
> POSE. And if I tap anywhere on the screen (I do *NOT* see another "got
> event") POSE is completely dead, and I cannot even exit or reset, and I have
> to kill the application in the Task Manager.
>
> This only seems to happen with 3.5.2H. I am running with ALL debug checks
> enabled, but do not get any errors or warnings. I do not get this error on
> my m505 or on my T615. Anybody have any ideas what could be causing this or
> how I can track it down? I can't use POSE's logging feature, because POSE
> completely dies and no log file is created. Thanks.
>
> Tom
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