Hi,
I have run into an issue with the difference between what
happens when a signal handler returns from a program converted
to use pthreads (vs non-pthreads).
Basically, in the non-pthread case, a change made to the
sc_eip element of the scp struct is honored when the kernel
restores the processes context.
In the pthreads case, the change to the sc_eip element
is ignored.
A test case which shows both a working and non-working
version of this resides at:
http://www.freebsd.org/~jwd/sigtst/
The makefile produces two executables:
fptrap : a 'correct' executable - non-pthreads
fptrapt: a 'bad' executable - pthreads
%./fptrap
** Result correct: 1234.57
%./fptrapt
** Result incorrect: 1
I'd like to hear if you've dealt with the issue of precise
error recovery and how it was dealt with. I'm currently exploring
whether a fix to the pthread library is feasible or whether
an application change is required (or conclude that the type
of error recovery I need can't be done with pthreads).
Thanks!
John
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