(libgcc) what does _Unwind_Resume do ?

[Andrew Haley]

Sunzir Deepur writes:
 > Hi Andrew,
 > 
 > On 10/20/07, Andrew Haley <aph-gcc@littlepinkcloud.com> wrote:
 > > Sunzir Deepur writes:
 > >  > I have noticed that glibc has extensive use of the _Unwind_Resume procedure
 > >  > Can anyone please explain me what is it ? why is it needed for C programs
 > >
 > > It's needed for pthread_cancel.
 > > It resumes unwinding after a cleanup.
 > >
 > > http://www.codesourcery.com/cxx-abi/abi-eh.html
 > > http://www.mit.edu/~sipb-iap/2004/inside-c/day3/exceptions.html
 > 
 > Is the winding relevant only to C++ exception catching ?
 > If so, why would it be needed when compiling simple C apps ?

I don't know that it is.

 > Thank you (and sorry for posting initialy at gcc@gcc.gnu.org),

I'm sure you can't have had time to read those references I sent you.
Have a look at what pthread_cancel does.  Have a look at what
pthread_cleanup_push does.

Andrew.