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continuum_save.sh: Improvements to locking code

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* moved the locking to a separate function "acquire_lock"
* changed $[ ] to $(( )), for consistency with the rest of the file
* taking the lock only after checking all other preconditions (they are non-mutating and thread-safe)
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v9v 2019-07-13 14:16:42 +02:00 committed by GitHub
parent 3917404668
commit ff63f86678
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1 changed files with 11 additions and 6 deletions
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17
scripts/continuum_save.sh
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@ -34,22 +34,27 @@ fetch_and_run_tmux_resurrect_save_script() {
fi fi
} }
main() { acquire_lock() {
# Sometimes tmux starts multiple saves in parallel. We want only one # Sometimes tmux starts multiple saves in parallel. We want only one
# save to be running, otherwise we can get corrupted saved state. # save to be running, otherwise we can get corrupted saved state.
local lockdir_prefix="/tmp/tmux-continuum-$(current_tmux_server_pid)-lock-" local lockdir_prefix="/tmp/tmux-continuum-$(current_tmux_server_pid)-lock-"
# The following implements a lock that auto-expires after 100...200s. # The following implements a lock that auto-expires after 100...200s.
local lock_generation=$[ `date +%s` / 100 ] local lock_generation=$((`date +%s` / 100))
local lockdir1="${lockdir_prefix}${lock_generation}" local lockdir1="${lockdir_prefix}${lock_generation}"
local lockdir2="${lockdir_prefix}$[ $lock_generation + 1 ]" local lockdir2="${lockdir_prefix}$(($lock_generation + 1))"
if mkdir "$lockdir1"; then if mkdir "$lockdir1"; then
trap "rmdir "$lockdir1"" EXIT trap "rmdir "$lockdir1"" EXIT
if mkdir "$lockdir2"; then if mkdir "$lockdir2"; then
trap "rmdir "$lockdir1" "$lockdir2"" EXIT trap "rmdir "$lockdir1" "$lockdir2"" EXIT
if supported_tmux_version_ok && auto_save_not_disabled && enough_time_since_last_run_passed; then return 0
fetch_and_run_tmux_resurrect_save_script
fi
fi fi
fi fi
return 1 # Someone else has the lock.
}
main() {
if supported_tmux_version_ok && auto_save_not_disabled && enough_time_since_last_run_passed && acquire_lock; then
fetch_and_run_tmux_resurrect_save_script
fi
} }
main main