libgcrypt RNG locking

Werner Koch wk at
Wed Feb 26 16:42:23 CET 2014

On Wed, 26 Feb 2014 13:53, smueller at said:

> If I try to trigger a simple deadlock by calling:
> drbg_lock(0);
> drbg_lock(0);
> there is no deadlock.

There are two possible reasons:  gpgrt could be using recursive mutexes
and thus you won't be able to create a deadlock with just one thread.
However, for common Linux systems this is not the case.  The second and
more likely reason is that you did not link with -lpthread and thus the
process has not thread support which makes mutexes pointless.  libgpg-error
uses ELF weak symbols to implement that.



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