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Re: lib/25563

The following reply was made to PR lib/25563; it has been noted by GNATS.

From: Andrew Doran <>
Subject: Re: lib/25563
Date: Fri, 27 Mar 2009 22:49:26 +0000

 On Fri, Mar 27, 2009 at 10:05:05PM +0000, David Holland wrote:
 >  On Fri, Mar 27, 2009 at 02:30:03PM +0000, Thomas Klausner wrote:
 >   > I just tried the program from this PR on 5.99.8/amd64, and it said:
 >   > self=0x7f7fffe00000
 >   > ENTER: handler
 >   > self=0x7f7ffd800000
 >   > LEAVE: handler
 >   >  
 >   > No segfault.
 >  I'd be surprised if this issue affected the new threads library; the
 >  question I guess is if it still affects 4.0_STABLE.
 It still does unfortunatley. We need thread local storage to sort it; TLS
 would be used for pthread__self(). I have a kernel change to make this a bit
 easier. _lwp_setprivate() calls into MD code to have it set up whatever fast
 path the architecture provides. I should commit this. Another change that I
 have not written is this: ucontext_t also needs an addtional field for the
 LWP private pointer (why this doesn't have a spare field available is, well,
 a depressing question). However, someone still needs to add support to the
 dynamic linker, C library and toolchain. There is interest in doing this,
 however no firm progress to date.

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