Commits on Nov 15, 2024

1. Use main thread of current Lua state for callbacks, when known …

   If the library is opened from a Lua thread (coroutine) that is not the main
   one, the stored L would be to that thread, which may become suspended (by
   calling yield). It is unsafe to call functions on suspended Lua threads, which
   luv does a lot (the stored L is used for callbacks).
   
   The main thread of a Lua state can never yield, so it is always safe to call
   callbacks on.
   
   This commit ensures the main thread is stored in the luv context instead of
   the current thread, when we are able to calculate it (LUA_RIDX_MAINTHREAD was
   added in Lua 5.2, and I have not found a way to determine the main thread in
   Lua 5.1).
   
   This fixes luvit#503

   

   mwild1 committed Nov 15, 2024
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