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This effectively reverts c54d93e and 991a168. While those fix #687 and
#688 respectively in the case where the configuration is recompiled, in
all other cases they leave zombie processes, since they undo the fix for
#181.
However, instead of reverting to the deprecated system function, we use
the newer spawnCommand and waitForProcess. And like with 991a168, the
low battery action now runs in the background to avoid blocking the bar.
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This should address the problems reported in issue #688
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This is needed for the plugin to parse properly in non-Haskell based
configurations.
Related: https://github.com/jaor/xmobar/issues/547
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programmatically
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hGetLineSafe is always hGetLine and hence we can directly use it.
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The first implementation assumed all timers (monitors) are fast and
frequent (which happens to be the case in my configuration). This meant
that a single on-line weather monitor could block the entire xmobar
instance for a long time due to the refresh pausing (meant to reduce
power consumption).
This commit attempts to fix that by limiting the refresh pause time and
using the old periodic sleep method for these slow timers (monitors).
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xmobar currently runs every monitor in its own thread. Monitors that do
periodic updates simply sleep and loop. This unfortunately leads to
these threads coming out of sync, and xmobar ends up waking up and
redrawing for every periodic monitor. In my case, that is 7 times per
second, which is enough for xmobar to be at the top of "top" with more
than 1% CPU usage, and to have a noticeable impact on battery life.
This commit adds a central timer coordination thread which makes sure
that periodic updates happen together and that we only redraw once
they're all done.
Together with PR #409, I managed to lower the idle power draw of my
laptop from 4W to 3W.
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A preparation for timer coalescing: tenthSeconds is just a sleep whereas
doEveryTenthSeconds enables using a central timer and waiting for all
monitors to update before refreshing the window. This commit is just a
simple refactor, the actual timer coalescing code comes later.
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