Windows support

[ghost]

Hello,

are there any plans for Windows support? I have tried to compile with VS 2015, but there are some linux specific includes, like fcntl.h, sys/types.h. Apart from that Windows will need mmap port.

[areese]

I don't see this working on windows due to the use of robust futexes, and mmap acts differently on windows.
:)

However, it has been a really long time since I've looked at the apis on windows.

[steve-carney]

The locking was originally designed to be pluggable.  We had the original ylock that was replaced with linux pthread locking.  It should be possible to create a Windows plugin, but I wouldn't expect it to be easy.
mmap implementations can also be a tricky point in how they treat map size rounding, and the page mapping interaction with (linux) remap_file_pages.
Steve

On Thursday, September 8, 2016 8:39 AM, Allen Reese <notifications@github.com> wrote:

I don't see this working on windows due to the use of robust futexes, and mmap acts differently on windows.
:)However, it has been a really long time since I've looked at the apis on windows.—
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[ghost]

@areese @steve-carney Thank you for your insights,guys :) Seems like i will have to move to linux platform, like 3/4 libraries which support on-disk datastore won´t compile or doesn´t work well on Windows. I have tried LMDB, but it didn´t perform very well.

[timrc-git]

@brano543 The original version of MDBM that came from Larry McVoy (many years ago) did support Win32, but it has been changed much since then. Thought I still had a copy, but couldn't find it.
There are ports of mmap (i.e. https://github.com/witwall/mman-win32), but there will definitely still be some issues.
As Steve mentioned, no robust locks, so if a process dies/exits holding a lock, you have to do messy manual cleanup. And certain features would have to be disabled (e.g. "windowed mode" because of remap_file_pages).

You might try out the new Ubuntu-in-userland mode for Win10 that MS just released, with the offending options disabled in Makefile.base. But I don't know if it will work. It sounds like there are still a number of issues (including pthreads problems).