in appscript/main.gs [329:342]
function runWithServiceLock(funcName, callback) {
if (!callback) return;
var lock = LockService.getScriptLock();
var success = lock.tryLock(100);
if (!success) {
var message = `Other existing ${funcName} is still running.`;
console.log(message);
return;
}
callback();
lock.releaseLock();
}