Re: Making Event work for Win32

On Tue, Mar 21, 2000 at 12:23:42PM +0000, [email protected] wrote:
> Paul Moore <[email protected]> writes:
> >I thought I'd look at putting my coding where my mouth is and seeing what would
> >be involved in getting Event working on Win32.
> >
> >Basically, it looks like the necessary changes could be pretty straightforward -
> >the system-specific stuff is localised in c/unix_io.c (and a bit in c/signal.c -
> >what's rsignal()?) I could probably hash up an IO watcher based on
> >MsgWaitForMultipleObjects() -- assuming that I can get from a Perl file object
> >to a Win32 HANDLE (I'm pretty sure I can).  
> 
> You can:   
> 
> long
> Lang_OSHandle(fd)
> int fd;
> {
> #ifdef WIN32
>  return win32_get_osfhandle(fd);
> #else
>  return fd;
> #endif
> }
> 
> >But there are two problems there -
> >first, Win32 waits on file HANDLEs are "discouraged" (I quote the
> >documentation...) - you;re supposed to use asynchronous IO instead.  
> 
> But MS's own C "stdio" runtime (which perl currently uses) cannot work with  
> asynchronous IO.

I see no compelling reason to suggest using MS's stdio.  If possible,
I'd like to avoid as many compatibility layers as possible and talk
directly to low-level APIs.

-- 
"Never ascribe to malice that which can be explained by stupidity."
                           via, but not speaking for Deutsche Bank