Does someone know whether Asterisk’s global variables are thread-safe?
I wish to read and write from within the dialplan and from the outside. The background is that I have a service provider who rotates his proxy servers in the background and doesn’t maintain the state of registrations. New calls may fail with 403 and a couple of other stupid things happen as well. The idea is basically to monitor the priorities of their proxy servers, send an unregister followed by a register when there are no ongoing calls and block new calls with a global variable which is supposed to act as a flag. The process of registration may take a few seconds, so I need to signal the current state. Not perfect, but could make life a bit easier.
They can be accessed and manipulated by multiple things at once, yes, but they are not locked. That is: A write followed by a read may produce a different result than what was written if something in between altered it.