optional single-thread runtime compatibility #10
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For single-thread runtimes, the Mutex used in async-shutdown can interfere with the task reactor. This patch allows a default multi-thread runtime support via feature, and allows for single-thread support when default features are off.
The code is wrapped within a
LockGuardwhich provides an interface similar to aRefCell.In the single-thread mode, there isn't support for cross-thread shutdown signaling, that coordination is left to the user to implement.