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
• Callbacks
• Vision for future API changes