Update Vim after it suspended?

Let's say i suspend an instance of vim with ctrl-Z or :suspend
Is there any way to use autocommands to update vim when I restart it with
fg on the command line?

Once put to sleep it will not know what might have happened, for instance in
viminfo after it went to sleep. Only method I can think of is to use the
fileChangedShell or fileChangedShellPost. While suspended, I could somehow
use touch to change the file's date.

When it wakes it should do autocommands triggered by the data change, but
I do not know how vim looks for this change? Does it check the status of its
file very n milliseconds to see if it changed? Must it be running while the
change is done through some other process?

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