When a function is executed a new thread object is created?

Question

According to the manual of version 5.3, a thread type value represents independent execution topics:

The type thread represents Independent threads of Execution and it is used to implement coroutines (see §2.6). Moon threads are not Related to Operating-system threads.

Does this mean that every time the body/scope of a function is executed a new thread is created? Or does this happen with all kinds of scope? For example:

-- Cria um thread (principal)

(function()
    -- Cria um thread
    for i = 1, 2 do
        -- Cria outro thread
    end
end)();

Or with functions only:

-- Cria um thread (principal)

(function()
    -- Cria um thread
    for i = 1, 2 do
    end
end)();

Answer 1

Question: this means that every time the body/scope of a function is executed a new thread is created ?
Answer: nay.

Question: or this happens with all kinds of scope ?
Answer: nay.

Explanation: A "thread" (when speaking of the Lua language) is created only when a coroutine is created (coroutine) through the function coroutine. and coroutine.wrap.

Reference: http://www.lua.org/manual/5.1/manual.html#2.11

Example of use: https://www.tutorialspoint.com/lua/lua_coroutines.htm

By the way, I think this style of coding:

(function()
   -- Cria um thread
   for i = 1, 2 do
       -- Cria outro thread
   end
end)();

which is quite common in Javascript is usually not used with Lua.