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Subject: RE: Threaded Cygwin Python Import Problem
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Date: Thu, 19 Jul 2001 10:58:06 +1000
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Thread-Topic: Threaded Cygwin Python Import Problem
Thread-Index: AcEP5g+sDu6ipZQfRhe+dit65l/HIAAB7Whw
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: <cygwin AT cygwin DOT com>
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Do WIN32 handles need to be specially opened to allow them to be
inherited into the child process created by fork?

Thats the only thing that needs fixing AFAICT.

Rob
 

> -----Original Message-----
> From: Christopher Faylor [mailto:cgf AT redhat DOT com]
> Sent: Thursday, July 19, 2001 10:09 AM
> To: cygwin AT cygwin DOT com
> Subject: Re: Threaded Cygwin Python Import Problem
> 
> 
> On Wed, Jul 18, 2001 at 07:47:38PM -0400, Greg Smith wrote:
> >
> >I think I've recreated Jason's threaded Python problem after fork(),
> >see the testcase below.  And this is on my w2k sp2 dual pIII 850
> >machine, where I have been unsuccessful in recreating Jason's
> >original Python testcase.
> >
> >I certainly do not claim Cygwin expertise, nor Windows API expertise,
> >and not as much *ix as I'd like (ask me about os/390, however, and
> >I'll give you a different story ;-).
> >
> >But, it looks like fork_copy() blindly copies everything from the
> >original process address space to the new address space, including
> >any pthread_mutex_t structures.  And neither __pthread_mutex_lock
> >nor WaitForSingleObject() recognize that the mutex is not properly
> >initialized.  If the comments in the testcase are removed (ie clear
> >the lock and initialize it), then the testcase runs as expected.
> 
> If that is the case then a "fixup_after_fork" routine is probably
> required.  You can see several of those in fork.cc.
> 
> cgf
> 
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