Prior to this change, if Lua unloads the threads library before the child
threads terminate, the program wil segfault. This could happen if an error
is triggered during an endcallback, preventing the child thread from exiting.
This places the thread's start routine in a separate shared library:
libthreadsmain, which is loaded once and never unloaded.
- removed the ffi dependency... now runs under lua!
- support for low-level thread
- support for basic mutex and condition variables from lua
- better error messaging
- better reliability
- more doc
- no more addjobasync()
- no sdl
