I can not claim if this is idiomatic or not, but the attached patch
allows Andrew Pollock to run for me with dash.
Past about 10 concurrent Xvfbs I get several messages along the lines
of:
XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":658.0"
after 102 requests (90 known processed) with 0 events remaining.
But they do not appear to indicate a problem; a script to take 100
screenshots of xclock in separate Xvfbs produced 100 valid screenshots
despite several messages like the one above.
** Attachment added: "Andrew Pollock's patch with the bashism removed"
http://launchpadlibrarian.net/27960767/bashisms-removed.diff
--
Race condition in /usr/bin/xvfb-run causes concurrent invocations to fail
https://bugs.launchpad.net/bugs/348052
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