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This CL contains three demos showing how to use //base scheduling and threading primitives. `See codelabs/threading_and_scheduling/README.md` for detailed documentation of this CL's additions. 01-single-task-queue: This first example is pretty trivial, it just shows the basics of creating a SequenceManager, TaskQueue, TaskRunner, and posting a task. 02-task-queue-priorities: This example demonstrates that multiple TaskQueues can be multiplexed within the same SequenceManager on a particular thread. It shows that "TaskQueue" is the principal unit of scheduling/ordering. That is, non-delayed tasks posted to the same TaskQueue are guaranteed to run in FIFO order, but tasks posted to different TaskQueues are run according to queue priorities. 03-randomized-task-queues: This example is similar to the last one, except we use two same priority TaskQueues that have their scheduling order randomized, to further demonstrate that the the task execution ordering *across* TaskQueues cannot be relied upon, while non-delayed tasks posted to the same TaskQueue are still guaranteed to run in FIFO order. This example is carried out by setting a random seed which randomizes which TaskQueue that gets served by the thread's SequenceManager at any given time. This is not the default setting in Chrome/base. 04-multiple-threads: This third example showcases how to post tasks to other threads. It builds off of the preexisting `codelabs/cpp101/factor.cc` example by not delegating to the ThreadPool, but by showing how to: - Set up multiple SequenceManagers (bound and unbound) - Use the base::Thread API with a custom delegate - Register TaskQueues on each thread - Post cross-thread delayed tasks Bug: N/A Change-Id: Ie36bad7f7c2b2682591d1ba83f48eccbdc0f8f81 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384135 Reviewed-by: Daniel Cheng <dcheng@chromium.org> Reviewed-by: Austin Sullivan <asully@chromium.org> Commit-Queue: Dominic Farolino <dom@chromium.org> Cr-Commit-Position: refs/heads/main@{#1088717}
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