Re: Parallel processes: multi-core, same CPU?

This is a known limitation with lua - you can't run two lua threads (under the same lua_State) in parallel. AFAIK lua allows you to define some locking primitives, but they only serve to lock the current lua_State while lua code is executing, so in effect, only one lua thread is really executing at a time.

Your best bet is to create one lua_State per OS thread and device some kind of communication protocol between different lua states (since two states cannot share tables).

P.S.: Once upon a time I tried to rewrite the lua engine with parallelism in mind, but it was so hopefully slow I won't even dignify it with a link here.

On Thursday, June 11th, 2026 at 3:21 AM, H J <[email protected]> wrote:

> Leveraging fast shared memory access on the same (dual-core) CPU, I want to spawn two threads on each core of the same CPU. Is this possible with luajit? (I've been looking into `effil` but don't see how you can direct the task to a specific core...).-- Henk
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