feature: check the number of parameters for ngx.thread.wait

Author: rainingmaster

src/ngx_http_lua_uthread.c

@@ -125,6 +125,9 @@ ngx_http_lua_uthread_wait(lua_State *L)
     coctx = ctx->cur_co_ctx;
 
     nargs = lua_gettop(L);
+    if (nargs == 0) {
+        return luaL_error(L, "at least one coroutine should be specified");
+    }
 
     for (i = 1; i <= nargs; i++) {
         sub_co = lua_tothread(L, i);

t/098-uthread-wait.t

@@ -1321,3 +1321,22 @@ $s;
 --- no_error_log
 [error]
 [alert]
+
+
+
+=== TEST 23: no parameters for ngx.thread.wait
+--- config
+    location /lua {
+        content_by_lua_block {
+            ngx.thread.wait()
+            ngx.say("ok")
+        }
+    }
+--- request
+GET /lua
+--- response_body_like: 500 Internal Server Error
+--- error_code: 500
+--- error_log
+at least one coroutine should be specified
+--- no_error_log
+[crit]