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Date:	Fri, 13 Jul 2001 16:10:28 -0400 (EDT)
From:	Ken Tew <ken2 AT andrew DOT cmu DOT edu>
To:	cygwin AT cygwin DOT com
Subject:	Bug in pthread_cond_signal under Win NT 4.0
Message-ID:	<Pine.LNX.4.21L-021.0107131554450.6237-300000@unix47.andrew.cmu.edu>
MIME-Version:	1.0

--42006283-6672078-995055028=:6237
Content-Type: TEXT/PLAIN; charset=US-ASCII


If you signal a condition variable without any threads actually waiting  
on the condition variable, then when a thread does wait on that variable
it will hang. 

I've attached the file pthread_bug_test.cpp which is a simple program to 
demonstrate the bug.

I also attached a modified thread.cc which fixes the bug.  It simply
checks to see if any threads are waiting on the condition before
signalling.  The only change I made to thread.cc was adding the line: 
  if (waiting) 
at line 452 in the file.  

----------
                                          \//////
                                          [ O o ]
 Ken Tew - Licensed to Program             \_=_/
   http://www.pitt.edu/~ktew               _| |_
                                          / \_/ \
________________________________________oOOO___OOOo__

--42006283-6672078-995055028=:6237
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Content-Transfer-Encoding: BASE64
Content-ID: <Pine DOT LNX DOT 4 DOT 21L-021 DOT 0107131610280 DOT 6237 AT unix47 DOT andrew DOT cmu DOT edu>
Content-Description: test code to show bug
Content-Disposition: attachment; filename="pthread_bug_test.cpp"

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--42006283-6672078-995055028=:6237
Content-Type: TEXT/PLAIN; charset=US-ASCII; name="thread.cc"
Content-Transfer-Encoding: BASE64
Content-ID: <Pine DOT LNX DOT 4 DOT 21L-021 DOT 0107131610281 DOT 6237 AT unix47 DOT andrew DOT cmu DOT edu>
Content-Description: fixed file
Content-Disposition: attachment; filename="thread.cc"

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