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authorTomas Janousek <tomi@nomi.cz>2021-05-14 21:47:41 +0100
committerTomas Janousek <tomi@nomi.cz>2021-05-14 22:05:09 +0100
commitf8c835a33a7acd6f60e27f82ac40027d3ae15e25 (patch)
tree2a61095406d166d0803c3b51dc4ac540e67fd80a /bench/main.hs
parent141f51828df91aca5508902164e7bbaa691ae759 (diff)
downloadxmobar-f8c835a33a7acd6f60e27f82ac40027d3ae15e25.tar.gz
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Fix delayed reaction to USR1/2 signals
While using xmobar to reproduce/fix a bug in xmonad I noticed that xmobar doesn't react immediately to the signals to reposition or change screen. Apparently none of the Xlib functions called from `repositionWin` flush the Xlib output buffer (XMoveResizeWindow is known to not flush, although it's unfortunately not documented), so when compiled with the threaded runtime that runs XNextEvent in a separate thread, the reposition is sent to the X server only later when other stuff happens. With all monitors set to refresh once a minute, this can take a looong time. (It's entirely possible this happens even without the threaded runtime, I didn't test that, sorry.) The fix is to call XSync at the end of `repositionWin`. While at it, I spotted that drawInWin calls XSync with discard=true, which seems like a mistake. We don't want to discard any events, do we? (In practice, I'd expect the `eventer` thread to read all events even before the drawing thread manages to discard them, so even if this discarding XSync ever had any reason to be there, I don't think it does anything meaningful these days. I may be wrong, though.)
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