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|
# Lock the given files.
# Append the names of lockfiles to the array lockfiles.
local file lockfile msgdone
# Number of attempts to lock a file. Probably not worth stylising.
integer lockattempts=4 loadtried
# The lockfile name is not stylised: it has to be a fixed
# derivative of the main fail.
for file; do
lockfile=$file.lockfile
for (( i = 0; i <= lockattempts; i++ )); do
if ln -s $file $lockfile >/dev/null 2>&1; then
lockfiles+=($lockfile)
break
fi
if zle && [[ -z $msgdone ]]; then
msgdone="${lockfile}: waiting to acquire lock"
zle -M $msgdone
fi
if (( ! loadtried )); then
zmodload -i zsh/zselect 2>/dev/null
(( loadtried = 1 ))
fi
if zmodload -e zsh/zselect; then
# This gives us finer grained timing (100th second).
# Randomize the sleep between .1 and 2 seconds so that
# we are much less likely to have multiple instances
# retrying at once.
zselect -t $(( 10 + RANDOM * 190 / 32768 ))
else
sleep 1
fi
done
if [[ -n $msgdone ]]; then
zle -M ${msgdone//?/ }
msgdone=
fi
if [[ ${lockfiles[-1]} != $lockfile ]]; then
msgdone="Failed to lock $file; giving up after $lockattempts attempts.
Another instance of calendar may be using it.
Delete $lockfiles if you believe this to be an error."
if zle; then
zle -M $msgdone
else
print $msgdone >&2
fi
# The parent should take action to delete any lockfiles
# already locked. Typically this won't be necessary, since
# we will always lock the main calendar file first.
return 1
fi
done
return 0
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