Re: Win32 Conditional support

[Federico Montesino Pouzols]

   Hi,

> Has anyone started work on providing support for Conditional objects on
> the Win32 platform?
>
> Would it make sense for common c++ to simply leverage the existing
> pthreads implementation for win32 at
> http://sources.redhat.com/pthreads-win32/.  It looks to be a pretty
> complete implementation that has support for condition variables, among
> other things.
>

   Well, using pthreads-win32 as the base to implement CC++'s conditionals
would imply changing the whole threading/synchronization Win32
implementation of CC++. Currently, the Win32 port of CC++ is based on
"native" Win32 calls, so we are talking of a very deep change.

   Sometime ago I used pthreads-win32 and it certainly works quite well
and stable. There would be however three issues if CC++ based its Win32
port on pthreads-win32:

   * We would impose an additional dependency for a core component of CC++.
   * We would have three layers (CC++/pthreads-win32/Win32 native). I do
not know pthreads-win32 internals so as to say if performance would
degrade significantly.
   * I am not sure if pthreads-win32 would be able to support all CC++
threading features. There have been some problems with cygwin emulation
layer.

   With this I do not want to say using pthreads-win32 is a bad idea,
but I think it would be simpler to implement Conditional with just
Win32 system calls.

> Personally, I would be happy with a win32 common c++ that simply linked
> against the win32 pthreads library as this would give me equivalent
> behavior between win32 and unix.  I'm not a big fan of the native Win32
> threading API.
>
> --Scott
>
>
>
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