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memoize-cached: add flock locking to run_memoized() to avoid error when run in parallel

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Ricardo Pardini
2023-04-16 20:16:16 +02:00
committed by Igor Pečovnik
parent 22059c2669
commit 8cd830d6e1
1 changed files with 9 additions and 0 deletions
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9
lib/functions/general/memoize-cached.sh
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@@ -39,6 +39,12 @@ function run_memoized() {
declare disk_cache_dir="${SRC}/cache/memoize/${MEMO_DICT[MEMO_TYPE]}"
mkdir -p "${disk_cache_dir}"
declare disk_cache_file="${disk_cache_dir}/${MEMO_DICT[MEMO_INPUT_HASH]}"
# Lock...
exec {lock_fd}> "${disk_cache_file}.lock" || exit_with_error "failed to lock"
flock "${lock_fd}" || exit_with_error "flock() failed"
display_alert "Lock obtained" "${disk_cache_file}.lock" "debug"
if [[ -f "${disk_cache_file}" ]]; then
declare disk_cache_file_mtime_seconds
disk_cache_file_mtime_seconds="$(stat -c %Y "${disk_cache_file}")"
@@ -63,5 +69,8 @@ function run_memoized() {
# ... and save the output to the cache; twist declare -p's output due to the nameref
declare -p "${var_n}" | sed -e 's|^declare -A ||' > "${disk_cache_file}"
# ... unlock.
flock -u "${lock_fd}"
return 0
}