Re: libc/1427: gprof does not profile threads <synopsis of the problem

[Dan Kegel]

Ulrich Drepper wrote:
> 
> On Wed, 2002-03-13 at 15:17, Dan Kegel wrote:
> 
> > So let's break the logjam and fix glibc's linuxthreads' pthread_create
> > to [support profiling multithreaded programs]
> 
> I will add nothing like this.  The implementation is broken enough and
> any addition just makes it worse.  If you patch your own code you'll get
> what you want at your own risk.

OK.  What's the right way to fix this, then?

Here are a few alternate ideas off the top of my head:

* Rip out Linuxthreads, replace it with NGPT, and
start fixing from there?  (Or does NGPT already fix this?)

* Rewrite Linux's setitimer(ITIMER_PROF,...) to set up an 
interval timer for all threads of the thread group.

* Implement the profil() system call from Solaris
( http://ua1vm.ua.edu/cgi-bin/man-cgi?profil+2 )

What's your favorite idea for getting profiling of
multithreaded programs working on Linux?

Thanks,
Dan