Can a function know if it works inside a coroutine?

Question

Is there a way for a function to know if it runs inside a coroutine?

For example, I have a send_message () function that tries to send a message three times. Between each attempt you need to wait one second. If this function is called from within a coroutine, I would like the send_message () function to execute the coroutine.yield () command as part of a 1 second wait loop. But if it is not inside the coroutine, then it should do POSIX usleep () instead.

Is there any way to do this?

Answer 1

Lua: coroutine.running() nil, , .

, coroutine.running() coroutine.status().

: http://www.lua.org/manual/5.1/manual.html#pdf-coroutine.running : http://www.lua.org/manual/5.1/manual.html#pdf-coroutine.status