fix rare livelock in std::map thread_buffer_requests

During initial session load it's possible that two threads call
PBD::notify_event_loops_about_thread_creation() simultaneously
(in particular the process threads). This can lead to an
endless loop in stl_tree.h when assigning thread_buffer_requests[key]

Now we only have WriteLocks.. unless some better solution comes up a
Mutex will do.

0 files changed, 0 insertions, 0 deletions