Please Tell Me Why Semaphore Lock Doesn't Work

[Tom]

Some time ago I compared different ways of using Semaphore Lock and Disable/Enable Macro and what they do exactly:

How to Prevent a Macro From Running Twice at the Same Time?

I noticed that the question in your topic title is not the same as the one in your post: (1) How to prevent a macro from running twice at the same time? ≠ (2) Anyway to prevent the second instance from starting if the first one is already active?‌ ‌‌ For question (1) the default Semaphore Lock is sufficient: The triggered macro instances will be queued, but each one will run eventually. (One after the other.) For question (2) you need either… a Semaphore lock with a very short timeou…

Maybe you will find it useful.