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Re: lib/46147 (mono problem (pthread change result?))

The following reply was made to PR lib/46147; it has been noted by GNATS.

From: Joerg Sonnenberger <>
Subject: Re: lib/46147 (mono problem (pthread change result?))
Date: Fri, 9 Mar 2012 02:47:57 +0100

 On Fri, Mar 09, 2012 at 01:20:04AM +0000, Matthew Mondor wrote:
 >  > According to my testing, this works now. Comments about boehm-gc only
 >  > working by accident still apply though.
 >  Do you think that anything using boehm-gc with threads currently faces
 >  the same problem as well?  I use ECL with it, built with threads
 >  enabled, and although it works pretty well, it's not 100% stable when I
 >  heavily test multithreaded applications (and that on both Linux and
 >  NetBSD).  There has been some work to reimplement ECL's locking system
 >  too though, and that's not considered stable either, but I use a custom
 >  implementation here which is more straightforward.
 >  But I'd very much like to know if boehm-gc itself is fundamentally
 >  broken in that area.
 boehm-gc needs to find all references to objects on the thread stacks.
 For that, it should use pthread_attr_get_np and pthread_attr_getstack on
 NetBSD. This provides the bottom of the stack and the size, in combination
 with __builtin_frame_address(0), that can precisely identify the stack
 content. At the moment it does some guessing based on the stack stack
 size, assuming alignment of the stack that isn't guaranteed by the

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