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Date: Sun, 15 Apr 2001 15:33:17 -0400
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: fork expert needed: (was Re: pthreads update for the adventurous)
Message-ID: <20010415153317.C9015@redhat.com>
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In-Reply-To: <001301c0c5af$9cb7e520$0200a8c0@lifelesswks>; from robert.collins@itdomain.com.au on Sun, Apr 15, 2001 at 11:25:58PM +1000

On Sun, Apr 15, 2001 at 11:25:58PM +1000, Robert Collins wrote:
>
>
>----- Original Message -----
>From: "Christopher Faylor" <cgf AT redhat DOT com>
>To: <cygwin AT cygwin DOT com>
>Sent: Sunday, April 15, 2001 11:06 PM
>Subject: Re: fork expert needed: (was Re: pthreads update for the
>adventurous)
>
>
>> On Sun, Apr 15, 2001 at 12:51:44PM +1000, Robert Collins wrote:
>>>>I added this dll relocation stuff last year to help with perl.  It
>>>>wasn't fun.
>>>
>>>Oh.  Well I infer that it only occurs with threads enabled in python,
>>>or Jason wouldn't be telling us.  Any hints Chris for possible
>>>races/locks that might prevent the child doing the relocation if the
>>>parent has active threads ?
>>
>>I believe the relocation happens during DLL initialization when all
>>other threads are suspended.
>>
>>cgf
>>
>
>fork() doesn't suspend all the threads in the parent.  The thread doing
>the call blocks, and the child is started with only one thread.  I
>don't believe all the threads are meant to be suspended under posix
>threads either - but I'll look into this.

Let me say this again:

"I believe the relocation happens during DLL initialization when all
other threads are suspended."

Please read up on MSDN on what happens during DLL initialization with
threads and stuff.  This isn't a Cygwin thing, it's a windows thing.

cgf

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