Summary:
If windows.h is not included in a particular way, it can conflict with other code including it. I don't know all the details, but having just one standard place where we include windows.h in header files seems best and seems to fix the internal issue we hit.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10885
Test Plan: CI and internal validation
Reviewed By: anand1976
Differential Revision: D40738945
Pulled By: pdillinger
fbshipit-source-id: 88f635e895b1c7b810baad159e6dbb8351344cac
Summary:
The motivation for this change is a planned feature (related to HyperClockCache) that will depend on a large array that can essentially grow automatically, up to some bound, without the pointer address changing and with guaranteed zero-initialization of the data. Anonymous mmaps provide such functionality, and this change provides an internal API for that.
The other existing use of anonymous mmap in RocksDB is for allocating in huge pages. That code and other related Arena code used some awkward non-RAII and pre-C++11 idioms, so I cleaned up much of that as well, with RAII, move semantics, constexpr, etc.
More specifcs:
* Minimize conditional compilation
* Add Windows support for anonymous mmaps
* Use std::deque instead of std::vector for more efficient bag
Pull Request resolved: https://github.com/facebook/rocksdb/pull/10810
Test Plan: unit test added for new functionality
Reviewed By: riversand963
Differential Revision: D40347204
Pulled By: pdillinger
fbshipit-source-id: ca83fcc47e50fabf7595069380edd2954f4f879c
