C 中的简单 lua_yield 无法从 Lua 正确恢复

我刚刚开始深入研究 lua 协程与 C，我对我认为应该是我能想到的最简单的例子有疑问。

The C:

#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <stdlib.h>

static int lua_test_yield(lua_State *L) {
        printf("1\n");
        lua_yield(L, 0);
        printf("2\n");
        lua_yield(L, 0);
        printf("3\n");
        lua_yield(L, 0);
        printf("4\n");
        lua_yield(L, 0);
        printf("5\n");
        lua_yield(L, 0);
        return 0;
}

static const struct luaL_Reg mylib[] = {
        {"test_yield", lua_test_yield},

        {NULL, NULL}
        };

// Used when the .so library is loaded from lua
int luaopen_mytest(lua_State *L) {
        luaL_newlib(L, mylib);
        return 1;
}

The Lua

mytest = require 'mytest'

print("Loaded")
mytest_yeild = coroutine.create(function ()
        mytest.test_yield()
end)

for i=1,5 do
        print(coroutine.resume(mytest_yeild))
end 

结果：

$ lua test.lua 
Loaded
1
true
true
false   cannot resume dead coroutine
false   cannot resume dead coroutine
false   cannot resume dead coroutine

我觉得这真的很奇怪。为什么它报告两次成功的简历但不打印任何内容然后报告失败的简历？我在这里缺少什么？谢谢。

要在让出后返回到 C 代码，您需要使用lua_yieldk并让它在一个单独的 C 函数中获取，如下所示：

#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
#include <stdlib.h>

static int lua_test_yield_6(lua_State *L, int status, lua_KContext ctx) {
        return 0;
}

static int lua_test_yield_5(lua_State *L, int status, lua_KContext ctx) {
        printf("5\n");
        return lua_yieldk(L, 0, 0, lua_test_yield_6);
}

static int lua_test_yield_4(lua_State *L, int status, lua_KContext ctx) {
        printf("4\n");
        return lua_yieldk(L, 0, 0, lua_test_yield_5);
}

static int lua_test_yield_3(lua_State *L, int status, lua_KContext ctx) {
        printf("3\n");
        return lua_yieldk(L, 0, 0, lua_test_yield_4);
}

static int lua_test_yield_2(lua_State *L, int status, lua_KContext ctx) {
        printf("2\n");
        return lua_yieldk(L, 0, 0, lua_test_yield_3);
}

static int lua_test_yield_1(lua_State *L) {
        printf("1\n");
        return lua_yieldk(L, 0, 0, lua_test_yield_2);
}

static const struct luaL_Reg mylib[] = {
        {"test_yield", lua_test_yield_1},

        {NULL, NULL}
        };

// Used when the .so library is loaded from lua
int luaopen_mytest(lua_State *L) {
        luaL_newlib(L, mylib);
        return 1;
}