Re: serious EH thread bug

[Jason Merrill <jason at cygnus dot com>]

>>>>> Teemu Torma <tot@trema.com> writes:

 > Mike Stump wrote:
 >> 
 >> There is a serious bug in the thread support code for EH.  The
 >> work-around, is to put a try { before any auto vars with dtors, temps
 >> with dtors or any other EH things.
 >> 
 >> I'm working on a fix now.  To observe it, try putting an auto var with
 >> a dtor before any try { and watch the value of
 >> libgcc.a(_eh.o):top_elt[2].  It changes.  Oops, this is a single
 >> shared global variable between all threads.  We can't be changing such
 >> a variable!
 >> 
 >> To fix it, I think all I want to do is unshare the variable via malloc.

 > In early versions, it was in the thread specific data, but Jason's
 > opinion was that it is just a sentinel, and never changes.  

 > Jason, is this still true, or could it be a bug somewhere else?

That doesn't ring a bell, sorry.  I don't remember what I was talking
about.

Jason