lua_tothread

Lua中协程与钩子函数的问题

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本文探讨了在Lua 5.1.4版本中使用协程(coroutine)和钩子函数(testHook)时遇到的问题。当从C调用Lua_State并设置行钩子(line hook)时，程序会在lvm.c的第71行崩溃。通过提供复现问题的代码示例，作者希望找到问题的原因及解决方案。

http://arcemu.org/forums/index.php?showtopic=19327

    Hello.

Call to lua function from c using yielded lua_State works fine. But same call with line hook set crashes in lvm.c line 71.

    Lua version 5.1.4

    Code to reproduce:

#include <stdio.h>

extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}

void testHook(lua_State *L, lua_Debug *ar)
{
    static int c = 0;
    c++;
}

int main(void)
{
    lua_State* l = lua_open();
    luaopen_base(l);

lua_sethook(l, testHook, LUA_MASKLINE, 0); //works fine when this line is commented

    const char* script =   "function func()    \
                                print('func1')    \
                            end    \
                            function threadFunc()    \
                                print('before yield')    \
                                coroutine.yield()    \
                                print('after yield')    \
                            end    \
                            thread = coroutine.create(threadFunc)    \
                            coroutine.resume(thread)    \
                            ";
    int rez = luaL_dostring(l, script);
    if (rez) {
        return 1;
    }

    lua_getglobal(l, "thread");
    lua_State* thread = lua_tothread(l, -1);

lua_getglobal(thread, "func"); //will work too if "l" state is used....

    if (lua_pcall(thread, 0, 0, 0)) {
        return 1;
    }

    lua_resume(thread, 0);

    return 0;
}

I believe that it should either work in both cases (wonder how?...) or report error even if no hook set...

--
WBR, Anatoly Ahmedov