[Freeswitch-users] mod_expr random not thread safe?

[Stanislav Sinyagin]

I'm building a test for voice quality, and I need to randomize the
silence preamble. At the same time, other sessions are recorded into a
tmpfs file.

<action application="set"
data="rand_val=${expr(randomize(&x);ceil(random(0,100,&x)))}"/>

I noticed that when I added this, the audio recordings started to have
gaps of dropped audio 40ms long.

Are the randomize() and random() thread-safe at all? It seems like the
whole FreeSWITCH process freezes when one of those functions gets
executed.