I was curious about this code snippet which appears in mod_fifo.c near line 3775 and again near line 3786:

len = node_caller_count(node);

switch_mutex_lock(node->update_mutex);

stream->write_function(stream, "%s:%d:%d:%d\n", argv[1], node->consumer_count, node_caller_count(node), len);

switch_mutex_unlock(node->update_mutex);

I was curious: what's the difference in the stream->write between node_caller_count(node) and len? Under what circumstances would they be different? (I'm assuming the locking of the mutex after setting the value of len may have something to do with it...)

Thanks,