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Previously each server starting ran xkbcomp with the output set to <keymapname>.xkm, read it, then deleted it - which led to races if two servers were starting at the same time with the same keymap. Sun bug #6773816 Xorg uses the same xkm output file for compiled keymap file <http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6773816>
The X server uses this directory to store the compiled version of the
current keymap and/or any scratch keymaps used by clients. The X server
or some other tool might destroy or replace the files in this directory,
so it is not a safe place to store compiled keymaps for long periods of
time. The default keymap for any server is usually stored in:
X<num>-default.xkm
where <num> is the display number of the server in question, which makes
it possible for several servers *on the same host* to share the same
directory.
Unless the X server is modified, sharing this directory between servers on
different hosts could cause problems.