fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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zczhu 96206531bc Support reservation in thread pool (#10278) ... Summary: Add `ReserveThreads` and `ReleaseThreads` functions in thread pool to support reservation in for a specific thread pool. With this feature, a thread will be blocked if the number of waiting threads (noted by `num_waiting_threads_`) equals the number of reserved threads (noted by `reserved_threads_`), normally `reserved_threads_` is upper bounded by `num_waiting_threads_`; in rare cases (e.g. `SetBackgroundThreadsInternal` is called when some threads are already reserved), `num_waiting_threads_` can be less than `reserved_threads`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10278 Test Plan: Add `ReserveThreads` unit test in `env_test`. Update the unit test `SimpleColumnFamilyInfoTest` in `thread_list_test` with adding `ReserveThreads` related assertions. Reviewed By: hx235 Differential Revision: D37640946 Pulled By: littlepig2013 fbshipit-source-id: 4d691f6b9a433569f96ab52d52c3defe5b065367		3 years ago
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rocksdb	Support reservation in thread pool (#10278)	3 years ago