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[Fwd: [ FOLLOWUP: 1.5.12: problems without registry keys]]


I think I tracked the problem down, reported in
I'm asking you since you were the one introducing cwdstuff->get_drive().

I found that the problem was raised by just using threads, nothing to do
with Semaphores, and only if a thread accesses cwdstuff one way or the
other.  A simple example for the hang is a thread which immediately calls

AFAICS there's a muto release missing in cwdstuff->get_drive().  This patch
solves Andrew's problem:

Index: cygheap.h
RCS file: /cvs/src/src/winsup/cygwin/cygheap.h,v
retrieving revision 1.93
diff -p -u -r1.93 cygheap.h
--- cygheap.h   26 Nov 2004 04:15:06 -0000      1.93
+++ cygheap.h   13 Dec 2004 18:02:45 -0000
@@ -235,6 +235,7 @@ struct cwdstuff
     get_initial (); 
     memcpy (dst, win32, drive_length); 
+    cwd_lock->release ();
     return drive_length;
   void init ();

Is that ok to apply or is there any good reason not to release the muto
when get_drive() has finished?  I can't see any, FWIW.


> ----- Forwarded message from Andrew Que -----
> From: Andrew Que 
> To: cygwin
> Subject: FOLLOWUP: 1.5.12: problems without registry keys
> Date: Wed, 8 Dec 2004 11:10:03 -0800 (PST)
>    I apologise ahead of time, I could not for the life
> of me figure out how to send a reply to a thread.  The
> original thread is 101373: "1.5.12: problems without
> registry keys"
>   In my original post, I noted not all apps crashed
> without the registry key.  So, I tried to narrow it
> down.  It looks like apps. that use semaphores lock up
> every time.
> I attached an example of an app that will lock up
> without the registry keys present.
> To compile:
>   gcc Semaphore.cpp -o Semaphore.exe
> (PS. The example is just a semaphore coalition test--
> and it's terrible code)

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