- * multiple processes on multiple web servers can run this code concurrently
- * try to make this as atomic as possible by setting doing_cron switch
- */
+ * Get the cron lock, which is a unix timestamp of when the last cron was spawned
+ * and has not finished running.
+ *
+ * Multiple processes on multiple web servers can run this code concurrently,
+ * this lock attempts to make spawning as atomic as possible.
+ */