Normally, operations scheduled with
later() will not execute unless/until
no other R code is on the stack (i.e. at the top-level). If you need to run
blocking R code for a long time and want to allow scheduled operations to run
at well-defined points of your own operation, you can call
those points and any operations that are due to run will do so.
Wait (block) for up to this number of seconds waiting for
an operation to be ready to run. If
A handle to an event loop. Defaults to the currently-active loop.
If one of the callbacks throws an error, the error will not be caught, and
subsequent callbacks will not be executed (until
run_now() is called again,
or control returns to the R prompt). You must use your own
tryCatch if you want to handle errors.
A logical indicating whether any callbacks were actually run.
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