RE: [Valgrind-users] New experimental skin: signal handler checker

[Troels W. H. <tr...@th...>]

Hi Nicholas,

I tried your skin on RH8 + all current updates.

It seems to work great and identified a potential deadlock (calling
pthread_mutex_unlock() in a SIGINT/SIGTERM handler) in one of the
applications I tried it with.

Didn't encounter any problems.

Definitely a nice addition to Valgrind's skin arsenal.

Troels

> -----Original Message-----
> From: val...@li... 
> [mailto:val...@li...] On Behalf 
> Of Nicholas Nethercote
> Sent: 2. juli 2003 12:06
> To: Valgrind Users
> Subject: [Valgrind-users] New experimental skin: signal 
> handler checker
> 
> 
> Hi,
> 
> I've written a new skin for Valgrind.  It's called Crocus, 
> and it searches
> for problems in signal handlers.
> 
> Because signal handlers can be called at any time, they 
> shouldn't call any
> functions that are non-reentrant, ie. functions that will 
> screw up if they
> are interrupted by another call to themselves, usually 
> because some shared
> or global data structure could be corrupted or overwritten.  Many
> functions are non-reentrant, including lots of common ones 
> like printf()
> (most standard I/O functions, in fact) and malloc().  You also aren't
> supposed to call any pthread functions from signal handlers, 
> as this can
> cause deadlock.
> 
> Lots of programs don't get this right;  Vim, for example.  Crocus
> identifies when a program's interrupt handler calls one of a number of
> common non-reentrant functions.  It also identifies when an interrupt
> handler doesn't preserve errno as it should.  To run this skin,
> download valgrind-CROCUS.tar.bz2 from:
> 
  www.cl.cam.ac.uk/~njn25/valgrind.html

install as normal, and run it with the --skin=crocus option. It's a
little
bit experimental, but has been tested reasonably well.   Thanks to Steve
Grubb for the original idea and testing it on a variety of programs.

I welcome any feedback.

N



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