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Subject:	Cygwin problems with Hyperthreaded machines?
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Message-ID:	<OFAFD2BF73.31E51C11-ON85256E59.00575DC5-85256E59.00574BE1@abinitio.com>
From:	Chuck McDevitt <cmcdevitt AT ABINITIO DOT COM>
Date:	Tue, 16 Mar 2004 10:55:14 -0500
X-IsSubscribed:	yes

I've been running into some severe problems with using Cygwin on 
Hyperthreaded machines.

The problem mostly occurs when capturing the stdout from a program with 
the backquote operator,
or using the shell command in makefiles.   The captured values end up as 
blank sometimes.

For example, in my Makefile, 

       source-dir          := $(strip $(shell pwd))

pwd always returns something, but source-dir sometimes gets set to an 
empty string.

This never happens on single-CPU non-hyperthreaded machines.

I've also seen occasional hangs during a make, again only on hyperthreaded 
machines.

I've tried the latest cygwin dll from cygwin.com, as well as the snapshot 
from 3/12, and I still get this problem.

Anyone else out there seeing this?   Is this a known problem?  Is there 
some version of the cygwin dll that doesn't have this problem?


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