Function FCEU_LuaFrameBoundary

src/lua-engine.cpp:6311–6379

}

void FCEU_LuaFrameBoundary()
{
	//printf("Lua Frame\n");

	// HA!
	if (!L || !luaRunning)
		return;

	// Our function needs calling
	lua_settop(L,0);
	lua_getfield(L, LUA_REGISTRYINDEX, frameAdvanceThread);
	lua_State *thread = lua_tothread(L,1);

	// Lua calling C must know that we're busy inside a frame boundary
	frameBoundary = TRUE;
	frameAdvanceWaiting = FALSE;

	numTries = 1000;
	int result = lua_resume(thread, 0);

	if (result == LUA_YIELD) {
		// Okay, we're fine with that.
	} else if (result != 0) {
		// Done execution by bad causes
		FCEU_LuaOnStop();
		const char *trace = CallLuaTraceback(L);

		lua_pushnil(L);
		lua_setfield(L, LUA_REGISTRYINDEX, guiCallbackTable);

		char errmsg [1024];
		sprintf(errmsg, "%s\n%s", lua_tostring(thread,-1), trace);

		// Error?
#ifdef __WIN_DRIVER__
				//StopSound();//StopSound(); //mbg merge 7/23/08
		MessageBox( hAppWnd, errmsg, "Lua run error", MB_OK | MB_ICONSTOP);
#else
		LuaPrintfToWindowConsole("Lua thread bombed out: %s\n", errmsg);
		fprintf(stderr, "Lua thread bombed out: %s\n", errmsg);
#endif
	} else {
		FCEU_LuaOnStop();
		//FCEU_DispMessage("Script died of natural causes.\n",0);
		// weird sequence of functions calls the above message each time the script starts or stops,
		// then this message is overrided by "emu speed" within the same frame, which hides this bug
		// uncomment onse solution is found
	}

	// Past here, the nes actually runs, so any Lua code is called mid-frame. We must
	// not do anything too stupid, so let ourselves know.
	frameBoundary = FALSE;

	if (!frameAdvanceWaiting) {
		FCEU_LuaOnStop();
	}

#ifndef __WIN_DRIVER__