88d85b6820
Summary: The original implementation of WinEnvIO::NowNanos() has a constant data overflow by: li.QuadPart *= std::nano::den; As a result, the api provides a incorrect result. e.g.: li.QuadPart=13477844301545 std::nano::den=1e9 The fix uses pre-computed nano_seconds_per_period_ to present the nano seconds per performance counter period, in the case if nano::den is divisible by perf_counter_frequency_. Otherwise it falls back to use high_resolution_clock. siying ajkr Pull Request resolved: https://github.com/facebook/rocksdb/pull/5062 Differential Revision: D14426842 Pulled By: anand1976 fbshipit-source-id: 127f1daf423dd4b30edd0dcf8ea0466f468bec12
This directory contains interfaces and implementations that isolate the rest of the package from platform details. Code in the rest of the package includes "port.h" from this directory. "port.h" in turn includes a platform specific "port_<platform>.h" file that provides the platform specific implementation. See port_posix.h for an example of what must be provided in a platform specific header file.