win32 nonblocking waitpid()

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

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Re: win32 nonblocking waitpid() by tye (Sage) on Jul 28, 2000 at 07:49 UTC
I was surprised that this wasn't supported. I checked why, and it kinda sucks. The code for win32_waitpid() [which was written in order to port Perl] accepts a `flags` argument and just ignores it. And then it goes on to do: `DWORD waitcode = WaitForSingleObject(hProcess, INFINITE);` [download] We need a simple patch that defines WNOHANG as 1 and then does: `DWORD waittime= (WNOHANG&flags) ? 0 : INFINITE; DWORD waitcode = WaitForSingleObject(hProcess, INFINITE);` [download] I don't supposed you'd like to produce such a patch to save me the time, would you? Or at least report it to the perl5-porters.	[reply] [d/l] [select]
RE: win32 nonblocking waitpid() by Anonymous Monk on Jul 28, 2000 at 23:12 UTC
NEVER MIND THE ABOVE! I managed to get ahold of VC++ and work out the patch. Of course, WNOHANG isn't defined under win32, so as a workaround for that I just `#ifndef WNOHANG #define WNOHANG 1 #endif` [download] near the top of win32.c Of course you must also add the check(s) (there's a conditional compilation there) for the return val WAIT_TIMEOUT now, in addition to the check for WAIT_FAILED...	[reply] [d/l]
RE: RE: win32 nonblocking waitpid() by tye (Sage) on Jul 29, 2000 at 00:27 UTC
Ah, but you need to put it in a .h file that will be included by the Posix module so that it will know that your vendor now* does define WNOWAIT. (short pause while I double check something before opening my big mouth -- something I almost never do) Posix.pm #include's perl.h which #include's config.h so the definition of WNOHANG needs to be added to each of the win32/config_H.* files except win32/config_h.PL. Thanks a ton for doing this!	[reply]
Re: win32 nonblocking waitpid() by Anonymous Monk on Jul 28, 2000 at 19:09 UTC
Well, I reported this to the perl5-porters mailing list... Unfortunately I don't currently have access to any windows development tools (other than perl on a laptop, where I discovered this) as I generally use Linux for everything. Perhaps you should go ahead with the patch...or see if someone on p5p takes it up. Thanks...	[reply]