CODEWITHSUNDEEP
lua
dsign
dsign

Reputation: 12700

Lua registry: it is shared by threads?

Lua provides a "registry" "that can be used by any C code to store whatever Lua values it needs to store". And threads "shares with the original thread its global environment", as said here. But I can not find any place where it says if it shares the register.

So that's basically my question: if the threads are derived from the same original state, do they share the table accessible at LUA_REGISTRYINDEX?

Upvotes: 2

Views: 824

Answers (1)

Textmode
Textmode

Reputation: 508

The Lua registry is part of the lua_State*, thus anything using or contained within a given Lua_state (Such as Lua threads: Co-routines) will also share its Registry.

Lua Threads (co-routines) are part of the lua_State* they were created from, and thus share the same Registry.

OS Threads will access whatever Registry is associated with the lua_State* passed to lua_getfield(...) (et al.).
Bare in mind that Lua's only assurance with respect to OS threading is that the Lua CAPI is reentrant and stores all its values in the lua_State*; its up to you properly manage the state to avoid simultaneous access and corruption.

Upvotes: 3

Related Questions