This directory has the following layout: - base/task/: public APIs for posting tasks and managing task queues. - base/task/thread_pool/: implementation of the ThreadPool. - base/task/sequence_manager/: implementation of the SequenceManager. - base/task/common/: implementation details shared by ThreadPool and SequenceManager. Apart from embedders explicitly managing a ThreadPoolInstance and/or SequenceManager instance(s) for their process/threads, the vast majority of users should only need APIs in base/task/. Documentation: * [Threading and tasks](/docs/threading_and_tasks.md) * [Callbacks](/docs/callback.md) * [Vision for future API changes](https://docs.google.com/document/d/1pySz2xeJ6kLlbzDnS2jqAC1F8T_6pLEV8pgaMfURXAw/edit)