fix for LDEV-640

[clitnak]

This looks like a big change but it is a lot of whitespace.

[bdw429s]

Use this URL to hide whitespace in the diff
https://github.com/lucee/Lucee4/pull/30/files?w=1

[micstriit]

we can not make that change, because this changes how scheduled tasks are working. let say you have a scheduled task that runs every minute and takes 90 seconds to execute, maybe you still expect that it runs every minutes even there are always 2 running at time. because you need the result of the scheduled task to be as fresh as possible. if we do a change like this we need a flag in the admin for this like "[x] skip if the previous thread is still running ..."

[micstriit]

In addition we should make a chage like this only for Lucee 5

[bdw429s]

I would be in favor of adding an option to only allow a single instance of the task. I would say that is the most common expectation and I've had multiple issues where tasks run long and start to break things when more than one of them is running.

[micstriit]

this is a setting from travis:
Limiting Concurrent Builds #
The maximum number of concurrent builds depends on the total system load, but one situation in which you might want to set a particular limit is:
if your build depends on an external resource and might run into a race condition with concurrent builds.
You can set the maximum number of concurrent builds in the settings pane for each repository.

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