yu@unisql.UUCP (Yeong-Ho Yu) (01/24/91)
I am trying to make a main event handler which will run for at least
the given time, and returns the control back to the program.
That is, it should be a temparary XtAppMainLoop.
I made up the following function:
void TempEventH(XtAppContext app, unsigned int time)
{
XEvent event;
XtAppAddTimeOut(app, time, NULL, NULL); /* put up a timer event */
while(!(XtAppPending(app) & XtIMTimer)){ /* until it arrives */
XtAppNextEvent(app, &event); /* do the event processing */
XtDispatchEvent(&event);
}
}
Of course, it does not work. But, I don't know why.
Any suggestions? Many thanks in advance.
--
Yeong-Ho Yu
Internet: execu!sequoia!unisql!yu@cs.utexas.edu
UUCP: {uunet, cs.utexas.edu!execu}!sequoia!unisql!yuasente@adobe.com (Paul Asente) (01/25/91)
In article <1100@unisql.UUCP> yu@unisql.UUCP (Yeong-Ho Yu) writes:
< I am trying to make a main event handler which will run for at least
<the given time, and returns the control back to the program.
<That is, it should be a temparary XtAppMainLoop.
<
< I made up the following function:
<
<void TempEventH(XtAppContext app, unsigned int time)
<{
< XEvent event;
<
< XtAppAddTimeOut(app, time, NULL, NULL); /* put up a timer event */
< while(!(XtAppPending(app) & XtIMTimer)){ /* until it arrives */
< XtAppNextEvent(app, &event); /* do the event processing */
< XtDispatchEvent(&event);
< }
<}
<
<Of course, it does not work. But, I don't know why.
<Any suggestions? Many thanks in advance.
From section 7.4 of the Xt spec, discussing XtAppNextEvent:
If the X event queue is empty, XtAppNextEvent flushes the X output buffers of
each Display in the application context and waits for an X event **while
looking at the other input sources and timeout values and calling any
callback procedures triggered by them.** [emphasis added]
In other words, your timer is getting triggered in XtAppNextEvent. You need
to use use XtAppProcessEvent to get the degree of control over event
dispatching that you want here.
-paul asente
asente@adobe.com ...decwrl!adobe!asenteasente@adobe.COM (01/25/91)
In article <1100@unisql.UUCP> yu@unisql.UUCP (Yeong-Ho Yu) writes: > I am trying to make a main event handler which will run for at least >the given time, and returns the control back to the program. >That is, it should be a temparary XtAppMainLoop. > > I made up the following function: > >void TempEventH(XtAppContext app, unsigned int time) >{ > XEvent event; > > XtAppAddTimeOut(app, time, NULL, NULL); /* put up a timer event */ > while(!(XtAppPending(app) & XtIMTimer)){ /* until it arrives */ > XtAppNextEvent(app, &event); /* do the event processing */ > XtDispatchEvent(&event); > } >} > >Of course, it does not work. But, I don't know why. >Any suggestions? Many thanks in advance. From section 7.4 of the Xt spec, discussing XtAppNextEvent: If the X event queue is empty, XtAppNextEvent flushes the X output buffers of each Display in the application context and waits for an X event **while looking at the other input sources and timeout values and calling any callback procedures triggered by them.** [emphasis added] In other words, your timer is getting triggered in XtAppNextEvent. You need to use use XtAppProcessEvent to get the degree of control over event dispatching that you want here. -paul asente asente@adobe.com ...decwrl!adobe!asente