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fix(lua): re-added code that ensures that the thread (and therefore any upvalues) don't get gc'ed in signal handler

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maelstrom 2025-07-11 01:39:18 +02:00
parent a5bbfe53f2
commit 75f0892748
2 changed files with 7 additions and 2 deletions
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7
core/src/datatypes/signal.cpp
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@ -25,13 +25,18 @@ LuaSignalConnection::LuaSignalConnection(lua_State* L, std::weak_ptr<Signal> par
// https://stackoverflow.com/a/31952046/16255372 // https://stackoverflow.com/a/31952046/16255372
// Save function so it doesn't get GC'd // Save function and current thread so they don't get GC'd
function = luaL_ref(L, LUA_REGISTRYINDEX); function = luaL_ref(L, LUA_REGISTRYINDEX);
lua_pushthread(L);
// For posterity, since I accidentally removed this once, the parent thread must not be
// deleted because it may (likely) contain upvalues that the handler references
thread = luaL_ref(L, LUA_REGISTRYINDEX);
} }
LuaSignalConnection::~LuaSignalConnection() { LuaSignalConnection::~LuaSignalConnection() {
// Remove LuaSignalConnectionthread so that it can get properly GC'd // Remove LuaSignalConnectionthread so that it can get properly GC'd
luaL_unref(state, LUA_REGISTRYINDEX, function); luaL_unref(state, LUA_REGISTRYINDEX, function);
luaL_unref(state, LUA_REGISTRYINDEX, thread);
} }
#if 0 #if 0

2
core/src/datatypes/signal.h
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@ -45,7 +45,7 @@ public:
class LuaSignalConnection : public SignalConnection { class LuaSignalConnection : public SignalConnection {
lua_State* state; lua_State* state;
int function; int function, thread;
friend Signal; friend Signal;
protected: protected: