MINOR: lua-thread: Use NULL context for main lua state
The goal is to no longer use "struct hlua" with global main lua_state.
This patch returns NULL value when some code tries go get the hlua struct
associated with a task through hlua_gethlua(). This functions is useful
only during runtime because the struct hlua contains only runtime states.
Some Lua functions allowed to yield are called from init environment.
I'm not sure this is a good practice. Maybe it will be clever to
disallow calling this kind of functions.
diff --git a/doc/lua-api/index.rst b/doc/lua-api/index.rst
index c45753d..adeec11 100644
--- a/doc/lua-api/index.rst
+++ b/doc/lua-api/index.rst
@@ -762,8 +762,8 @@
Immediately stops the current Lua execution and returns to the caller which
may be a sample fetch, a converter or an action and returns the specified
- value (ignored for actions). It is used when the LUA process finishes its
- work and wants to give back the control to HAProxy without executing the
+ value (ignored for actions and init). It is used when the LUA process finishes
+ its work and wants to give back the control to HAProxy without executing the
remaining code. It can be seen as a multi-level "return".
.. js:function:: core.yield()