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Function std.parallelism.Task.yieldForce
If the Task isn't started yet, execute it in the current thread.
If it's done, return its return value, if any. If it's in progress,
wait on a condition variable. If it threw an exception, rethrow that
exception.
This function should be used for expensive functions, as waiting on a condition variable introduces latency, but avoids wasted CPU cycles.
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