rt: Allow concurrent Shell:block_on calls
#2868
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LucioFranco
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A-tokio
carllerche
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Sep 24, 2020
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Related to #2720
This makes
Shell::block_ongo from a&mut selfto&selfand follows a similar pattern to #2804. Similar to the basic_scheduler this will wrap the driver in a mutex and allow a single thread to park the driver. Once, that thread is done with the parker it will replace it back into the mutex state and it will useNotifyto wake up other threads to then attempt to steal the driver.