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Add locking support

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This is a prerequisite for adding oneshot mode, see #27.
This commit is contained in:
Chris Down 2017-02-17 20:39:25 -05:00
parent 0b58a886a6
commit b839f80779
1 changed files with 12 additions and 0 deletions
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12
clipmenud
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@ -3,6 +3,8 @@
major_version=3 major_version=3
cache_dir=/tmp/clipmenu.$major_version.$USER/ cache_dir=/tmp/clipmenu.$major_version.$USER/
cache_file=$cache_dir/line_cache cache_file=$cache_dir/line_cache
lock_file=$cache_dir/lock
lock_timeout=2
get_first_line() { get_first_line() {
# Args: # Args:
@ -48,7 +50,15 @@ mkdir -p -m0700 "$cache_dir"
declare -A last_data declare -A last_data
declare -A last_filename declare -A last_filename
exec {lock_fd}> "$lock_file"
while sleep "${CLIPMENUD_SLEEP:-0.5}"; do while sleep "${CLIPMENUD_SLEEP:-0.5}"; do
if ! flock -x -w "$lock_timeout" "$lock_fd"; then
printf 'ERROR: %s\n' \
'Timed out waiting for lock, skipping this run' >&2
continue
fi
for selection in clipboard primary; do for selection in clipboard primary; do
data=$(xsel --logfile /dev/null -o --"$selection"; printf x) data=$(xsel --logfile /dev/null -o --"$selection"; printf x)
@ -106,4 +116,6 @@ while sleep "${CLIPMENUD_SLEEP:-0.5}"; do
xsel --logfile /dev/null -o --"$selection" | xsel -i --"$selection" xsel --logfile /dev/null -o --"$selection" | xsel -i --"$selection"
fi fi
done done
flock -u "$lock_fd"
done done