Commits on Sep 9, 2021

1. worker: avoid potential deadlock on NearHeapLimit …

   It can happen that the `NearHeapLimit` callback is called while calling
   the `oninit()` function on `MessagePort` construction causing a deadlock
   when the `Worker::Exit()` method is called, as the `mutex_` was already
   held on the `CreateEnvMessagePort()` method. To fix it, just use the
   `mutex_` to protect the `child_port_data_` variable and avoid holding it
   when creating the `MessagePort`.
   Also, return early from `Worker::Run()` if the worker message port
   could not be created.
   
   Fixes: nodejs#38208

   

   santigimeno committed Sep 9, 2021
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