Bug 467 - Xfree86's "smart scheduler" breaks Xprt
Summary: Xfree86's "smart scheduler" breaks Xprt
Status: RESOLVED WONTFIX
Alias: None
Product: xprint
Classification: Unclassified
Component: Server: Other (show other bugs)
Version: unspecified
Hardware: All All
: high blocker
Assignee: Roland Mainz
QA Contact:
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Depends on: 491
Blocks:
  Show dependency tree / graph
 
Reported: 2004-04-13 17:06 UTC by Roland Mainz
Modified: 2011-09-13 12:19 UTC (History)
5 users (show)

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Description Roland Mainz 2004-04-13 17:06:28 UTC 
Xfree86's "smart" scheduler seems to break Xprt. If the "smart scheduler" is
active the print jobs are incomplete, usually huge chunks in PostScript jobs are
missing (other symptoms of the problems are random crashes).

Known workarounds:
Compile with |#define UseSmartScheduler NO| or run Xprt with -dumbSched
Comment 1 Roland Mainz 2004-04-13 17:07:21 UTC 
Does anyone have a clue what may go wrong here ?
Comment 2 Roland Mainz 2004-04-17 12:50:07 UTC 
For the log:
I checked-in a workaround for the bug with bug 491 ("RFE: Need workaround for
bug 467 ("Xfree86's smart scheduler breaks Xprt").

During writing the workaround I found an intersting detail:
First I tried to set |SmartScheduleDisable = TRUE| in |PrinterInitOutput()| -
but that had no effect on the problem. The variable still remained |TRUE|, e.g.
the value was never changed but the problem still occured.
Initalising |SmartScheduleDisable = TRUE| like I did for the current workaround
in  bug 491 seems to work - and running Xprt with the |-dumbSched| works, too.
Conclusion:
Looking at dix/main.c something between |ProcessCommandLine()| and
|PrinterInitOutput()| is causing the problem.

Guessing:
Maybe the signal handling for the smart scheduler interfers with the detail that
the Xprint DDXs create child processes...
Comment 3 Roland Mainz 2004-04-17 12:50:40 UTC 
BTW: Who wrote the XF86 "smart scheduler" initially ?
Comment 4 Alan Coopersmith 2004-04-17 12:52:22 UTC 
Keith Packard wrote it - see http://keithp.com/~keithp/talks/usenix2000/smart.html
Comment 5 Corbin Simpson 2011-09-13 12:19:57 UTC 
Closing WONTFIX because nobody cares about Xprint. Reopen if you plan to address this bug.

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