thread safety in gnutls [was: Re: Handshake and verification]

Daniel Kahn Gillmor dkg at
Wed Dec 9 15:51:44 CET 2009

Hi Laurence--

On 12/09/2009 09:06 AM, lfinsto at wrote:
> I've been working on my client-server pair with X.509 authentication,
> using the code from the examples in the manuals.  I've put the code for
> handling the connections into a (POSIX) thread function, i.e., one passed
> to `pthread_create'.  In order to test this, I've made it possible to call
> the client with a `--sleep' argument to put it to sleep for a few seconds.
>  I call it several times and put it into the background, so several
> clients can be running and connected to the server at the same time.
> I got this error:
> optdbsrv: ath.c:186: _gcry_ath_mutex_lock: Assertion `*lock ==
> ((ath_mutex_t) 0)' failed.
> Aborted
> I was able to fix it by locking and unlocking a mutex before and after the
> call to `gnutls_handshake'.

are you initializing gcrypt itself to be threadsafe in your
multithreaded program?


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