Re: when multi threading,"luaL_dostring" crashes in Lua 5.4, but works fine in Lua 5.1

Would you mind explaining what this code is meant to show?


> #include "lua-nakh.hxx"
> #include <iostream>
> #include <unistd.h>
> #include <string.h>
> 
> void* TheThread(void*);
> 
> int SetordaneNakh(lua_State* L) {
>     return 0;
> }
> 
> int BastaneNakh(lua_State* L) {
>     return 0;
> }
> 
> static luaL_Reg const lua_nakh_library[] = {
>     { "SetordaneNakh", SetordaneNakh },
>     { "NakheTaazeh", NakheTaazeh },
>     { "BastaneNakh", BastaneNakh },
>     { nullptr, nullptr }
> };
> 
> static std::string matne_code;
> 
> /* code text, shared table */
> int NakheTaazeh(lua_State* L) {
>     std::cout<<"L1"<<std::endl;
>     matne_code = lua_tolstring(L, -1, nullptr);
>     std::cout<<"L2"<<std::endl;
>     lua_gettable(L, -1);
>     std::cout<<"L3"<<std::endl;
> 
>     Thread* thread = new struct Thread;
>     memset(thread, 0, sizeof(Thread));
>     thread->L = luaL_newstate();
>     thread->thread_code = &matne_code;
> 
>     std::cout<<"L4"<<std::endl;
>     std::cout<<*thread->thread_code<<std::endl;
>     std::cout<<"L5"<<std::endl;
>     lua_pushlightuserdata(L, thread);
>     std::cout<<"L6: "<<(const void*)thread<<std::endl;
>     std::cout<<"L7"<<std::endl;
> 
>     if(pthread_create(&thread->thread, nullptr, TheThread, thread) != 0) {
>         delete thread;
>         std::cout<<"Thread error"<<std::endl;
>         return -1;
>     }
>     std::cout<<"L8"<<std::endl;
> 
>     if(pthread_detach(thread->thread) != 0) {
>         delete thread;
>         std::cout<<"Thread error detach"<<std::endl;
>         return -2;
>     }
>     std::cout<<"L9"<<std::endl;
> 
>     return 1;
> }
> 
> /*
>     if (luaL_loadbuffer(L2, (const char *) matne_code->c_str(),
> matne_code->size(), "thread1-L2") != 0)
>     {
>         auto error = lua_tostring(L2, -1);
>         std::cout<<"loadbuffer() has errors. "<<error<<std::endl;
>     }
>     lua_pcall(L2, 0, 0, 0);
>     std::cout<<"Post()"<<std::endl;
> */
> 
> void* TheThread(void* arg) {
>     std::cout<<"C1"<<std::endl;
>     struct Thread* thread = (struct Thread*) arg;
>     std::cout<<"C2: "<<thread->thread_code->c_str()<<std::endl;
>     //thread->L = luaL_newstate();
>     lua_State *L = thread->L;
>     std::cout<<"C3"<<std::endl;
>     luaL_openlibs(L);
>     std::cout<<"C4"<<std::endl;
>     if(luaL_dostring(L, thread->thread_code->c_str()) != 0)//LUA_OK)
>         std::cout<<"ERROR"<<std::endl;
>     std::cout<<"C5"<<std::endl;
>     //if(lua_pcall(L, 0, LUA_MULTRET, 0) != LUA_OK)
>     //    std::cout<<"ERROR pcall"<<std::endl;
>     std::cout<<"C6"<<std::endl;
> 
>     std::cout<<"TheThread(): "<<thread->thread_code->c_str()<<std::endl;
> 
>     return nullptr;
> }
> 
> int luaopen_nakh(lua_State* L) {
>     //luaL_newlib(L, lua_nakh_library);
>     luaL_register(L, "lua-nakh", lua_nakh_library);
>     return 1;
> }
> 
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-- Roberto

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