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Subject:	found possible suspect for characters out of order bug
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Date:	Tue, 11 Sep 2001 10:39:57 +1000
Message-ID:	<EA18B9FA0FE4194AA2B4CDB91F73C0EF08F154@itdomain002.itdomain.net.au>
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Thread-Topic:	found possible suspect for characters out of order bug
Thread-Index:	AcE6WkhSvyTHhF/aTRKFzC3T8isX/w==
From:	"Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To:	<cygwin-developers AT cygwin DOT com>
X-MIME-Autoconverted:	from quoted-printable to 8bit by delorie.com id UAA08010

Remember the bug that keeps getting odd reports? Well I've got it
happening regularly to me at home. I couldn't discuss it last night - no
internet connection :[.

What I think is happening is that the fhander_termios edit_line method
is getting called as a signal. If any out of order queueing occurs with
signals, that would cause the percieved symptoms.

It only happened during heavy system load - this is an emulated machine
- which is to say any swapping or high CPU would cause it. It also only
appeared to occur during type-ahead occurences.

I'm still unable to debug, and I've never seen this happen to my win2k
partition (which is gotten at via reboot :} ) so what I can do is
limited.

Questions for the group though: 
Are whatever windows signals are before they hit cygwin time-order
guaranteed?
Are cygwin signals time-order guaranteed?
Are signal handlers expected to be reentrant?

Rob

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