Lucian Petrut 172adce767 Posix threads (#6865)
Summary:
Rocksdb is using the c++11 std::threads feature. The issue is that
MINGW only supports it when using Posix threads.

This change will allow rocksdb::port::WindowsThread to be replaced
with std::thread, which in turn will allow Rocksdb to be cross
compiled using MINGW.

At the same time, we'll have to use GetCurrentProcessId instead of _getpid.

Signed-off-by: Lucian Petrut <lpetrut@cloudbasesolutions.com>
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6865

Reviewed By: cheng-chang

Differential Revision: D21864285

Pulled By: ajkr

fbshipit-source-id: 0982eed313e7d34d351b1364c1ccc722da473205
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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.