John McCall 7cc63f9a28 Implement a cooperative global executor for single-threaded runtimes. ...

Currently, the only thing in the system that donates a thread
to run it is swift_runAndBlockThread, but we'll probably need
others.  Nothing in the concurrency runtime should block via a
semaphore in this configuration.

As an outrageous hack, work around the layering problems with
using libdispatch from the concurrency library on non-Darwin
systems by making those systems use the cooperative global
executor.  This is only acceptable as a temporary solution
for landing this change and setting things onto the right
long-term design.

2020-12-10 19:18:53 -05:00

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