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* cygtls.cc (_cygtls::init_exception_handler): Force installation of our 

exception handler to always be at the beginning.
This commit is contained in:
Christopher Faylor 2010-02-24 00:03:42 +00:00
parent 84f66e46b9
commit fd4a56afe8
2 changed files with 29 additions and 7 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2010-02-23 Christopher Faylor <me+cygwin@cgf.cx>
* cygtls.cc (_cygtls::init_exception_handler): Force installation of
our exception handler to always be at the beginning.
2010-02-23 Christopher Faylor <me+cygwin@cgf.cx>
* thread.cc (pthread_mutex::unlock): Don't attempt to unlock if there

31
winsup/cygwin/cygtls.cc
View File

@ -240,14 +240,30 @@ _cygtls::init_exception_handler (exception_handler *eh)
a problem if some previous exception handler tries to do things that are
better left to Cygwin. I await the cygwin mailing list notification of
this event with bated breath.
(cgf 2009-07-17)
(cgf 2009-07-17) */
for (exception_list *e = _except_list;
e != NULL && e != (exception_list *) -1;
e = e->prev)
if (e == &el)
return;
el.handler = eh;
A change in plans: In the not-so-distant past of 2010-02-23 it was
discovered that something was moving in ahead of cygwin's exception
handler so just detecting that the exception handler was loaded wasn't
good enough. I sort of anticipated this. So, the next step is to remove
the old exception handler from the list and add it to the beginning.
The next step will probably be to call this function at various points
in cygwin (like from _cygtls::setup_fault maybe) to absoltely ensure that
we have control. For now, however, this seems good enough.
(cgf 2010-02-23)
*/
exception_list *e = _except_list;
if (e == &el)
return;
while (e && e != (exception_list *) -1)
if (e->prev != &el)
e = e->prev;
else
{
e->prev = el.prev;
break;
}
/* Apparently Windows stores some information about an exception and tries
to figure out if the SEH which returned 0 last time actually solved the
problem, or if the problem still persists (e.g. same exception at same
@ -259,6 +275,7 @@ _cygtls::init_exception_handler (exception_handler *eh)
Windows 2008, which irremediably gets into an endless loop, taking 100%
CPU. That's why we reverted to a normal SEH chain and changed the way
the exception handler returns to the application. */
el.handler = eh;
el.prev = _except_list;
_except_list = &el;
}