[x265] xp support

[Roger Pack]

On 3/25/14, Steve Borho <steve at borho.org> wrote:
> On Tue, Mar 25, 2014 at 11:25 AM, Roger Pack <rogerdpack2 at gmail.com> wrote:
>> Hello.  I noticed in a recent discussion that seemingly windows xp
>> support had been "dropped" to clean up code:
>>
>> http://forum.videohelp.com/threads/357754-%5BHEVC%5D-x265-EXE-mingw-builds?goto=newpost
>
> I would describe the situation more as we needed to use a
> synchronization primitive (condition variable) in order to prevent
> deadlocks and that primitive is not supported on XP.  This wasn't a
> code cleanup, it was fixing a serious race hazard.
>
>> This does make it a bit painful for distributors who want to
>> distribute (for instance) ffmpeg with libx265 support, but also still
>> want to distribute "one executable" for all our users (including XP
>> users)...
>>
>> Just throwing this out there, but maybe x265 can use pthread style
>> condition variables then it be compiled against win32-pthreads project
>> or what not, when needed.  Or something like that.
>
> Adding support for a second threading library on Windows just for XP
> is a non-starter, but I would welcome a patch that adds an XP safe
> ThreadSafeInteger class.  Option 3.3 from
> http://www.cs.wustl.edu/~schmidt/win32-cv-1.html looks to be a viable
> solution, but it will be some time before this makes it to the top of
> my TODO list.

I guess my hope was that it coudl basically just be coded using
pthreads (to support linux), then windows users would be required to
provide a pthread library of their choosing...
FWIW.
-roger-