chaoyli commented on issue #2895: Import new ThreadPool framework URL: https://github.com/apache/incubator-doris/pull/2895#issuecomment-585767725 Thread design point: 1. It is a thin wrapper around pthread that can register itself with the singleton ThreadMgr (a private class implemented in thread.cpp entirely, which tracks all live threads so that they may be monitored via the debug webpages). This class has a limited subset of boost::thread's API. Construction is almost the same, but clients must supply a category and a name for each thread so that they can be identified in the debug web UI. Otherwise, join() is the only supported method from boost::thread. 2. Each Thread object knows its operating system thread ID (TID), which can be used to attach debuggers to specific threads, to retrieve resource-usage statistics from the operating system, and to assign threads to resource control groups. 3. Threads are shared objects, but in a degenerate way. They may only have up to two referents: the caller that created the thread (parent), and the thread itself (child). Moreover, the only two methods to mutate state (join() and the destructor) are constrained: the child may not join() on itself, and the destructor is only run when there's one referent left. These constraints allow us to access thread internals without any locks.
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