Runs tasks asynchronously in an ordered manner. For each put call, return a Promise which resolves to the given delegate's return value. The taskFun is evaluated in a separate thread. Unlike threadAsync, at most one task will execute at any given time (per AsyncQueue instance), they will be executed in the order of the put calls, and the promises will be resolved in the main thread in the same order.
Evaluate value in a new thread. The promise is resolved in the current (calling) thread.
Given a function fun which returns a promise, globally memoize it (across all threads), so that at most one invocation of fun with the given parameters is invoked during the program's lifetime. If a fun promise is in progress (incl. if started by another thread), wait for it to finish first.
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Promise concurrency tools.