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MEDIUM: lua: each yielding function returns a wake up time.

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This is used to ensure that the task doesn't become a zombie
when the Lua returns a yield. The yield wrapper ensure that an
timer used for waking up the task will be set.

The timer is reseted to TICK_ETERNITY if the Lua execution is
done.
This commit is contained in:
Thierry FOURNIER 2015-03-03 17:17:55 +01:00 committed by Willy Tarreau
parent bd41349831
commit c42c1ae885
2 changed files with 47 additions and 14 deletions
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1
include/types/hlua.h
View File

@ -35,6 +35,7 @@ struct hlua {
-1 if the memory context is not used. */
int nargs; /* The number of arguments in the stack at the start of execution. */
unsigned int flags; /* The current execution flags. */
int wake_time; /* The lua wants to be waked at this time, or before. */
int expire; /* Lua execution must be stopped over this time. */
struct task *task; /* The task associated with the lua stack execution.
We must wake this task to continue the task execution */

60
src/hlua.c
View File

@ -509,6 +509,25 @@ static inline void hlua_sethlua(struct hlua *hlua)
ebpt_insert(&hlua_ctx, &hlua->node);
}
/* This function just ensure that the yield will be always
* returned with a timeout and permit to set some flags
*/
__LJMP void hlua_yieldk(lua_State *L, int nresults, int ctx,
lua_CFunction k, int timeout)
{
struct hlua *hlua = hlua_gethlua(L);
/* Set the wake timeout. If timeout is required, we set
* the expiration time.
*/
hlua->wake_time = timeout;
if (hlua->wake_time == TICK_ETERNITY)
hlua->wake_time = hlua->expire;
/* Process the yield. */
WILL_LJMP(lua_yieldk(L, nresults, ctx, k));
}
/* This function initialises the Lua environment stored in the session.
* It must be called at the start of the session. This function creates
* an LUA coroutine. It can not be use to crete the main LUA context.
@ -644,6 +663,7 @@ static enum hlua_exec hlua_ctx_resume(struct hlua *lua, int yield_allowed)
break;
case LUA_ERRRUN:
lua->wake_time = TICK_ETERNITY;
if (!lua_checkstack(lua->T, 1)) {
ret = HLUA_E_ERR;
break;
@ -659,6 +679,7 @@ static enum hlua_exec hlua_ctx_resume(struct hlua *lua, int yield_allowed)
break;
case LUA_ERRMEM:
lua->wake_time = TICK_ETERNITY;
lua_settop(lua->T, 0); /* Empty the stack. */
if (!lua_checkstack(lua->T, 1)) {
ret = HLUA_E_ERR;
@ -669,6 +690,7 @@ static enum hlua_exec hlua_ctx_resume(struct hlua *lua, int yield_allowed)
break;
case LUA_ERRERR:
lua->wake_time = TICK_ETERNITY;
if (!lua_checkstack(lua->T, 1)) {
ret = HLUA_E_ERR;
break;
@ -684,6 +706,7 @@ static enum hlua_exec hlua_ctx_resume(struct hlua *lua, int yield_allowed)
break;
default:
lua->wake_time = TICK_ETERNITY;
lua_settop(lua->T, 0); /* Empty the stack. */
if (!lua_checkstack(lua->T, 1)) {
ret = HLUA_E_ERR;
@ -1133,7 +1156,7 @@ __LJMP static int hlua_socket_receive_yield(struct lua_State *L)
appctx = objt_appctx(socket->s->si[0].end);
if (!hlua_com_new(hlua, &appctx->ctx.hlua.wake_on_read))
WILL_LJMP(luaL_error(L, "out of memory"));
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_socket_receive_yield));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_receive_yield, TICK_ETERNITY));
return 0;
}
@ -1283,7 +1306,7 @@ static int hlua_socket_write_yield(struct lua_State *L)
appctx = objt_appctx(socket->s->si[0].end);
if (!hlua_com_new(hlua, &appctx->ctx.hlua.wake_on_write))
WILL_LJMP(luaL_error(L, "out of memory"));
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_socket_write_yield));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_write_yield, TICK_ETERNITY));
return 0;
}
@ -1513,7 +1536,7 @@ __LJMP static int hlua_socket_connect_yield(struct lua_State *L)
if (!hlua_com_new(hlua, &appctx->ctx.hlua.wake_on_write))
WILL_LJMP(luaL_error(L, "out of memory error"));
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_socket_connect_yield));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_connect_yield, TICK_ETERNITY));
return 0;
}
@ -1553,7 +1576,7 @@ __LJMP static int hlua_socket_connect(struct lua_State *L)
*/
task_wakeup(socket->s->task, TASK_WOKEN_INIT);
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_socket_connect_yield));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_connect_yield, TICK_ETERNITY));
return 0;
}
@ -1938,7 +1961,7 @@ __LJMP static int hlua_channel_dup(lua_State *L)
chn = MAY_LJMP(hlua_checkchannel(L, 1));
if (_hlua_channel_dup(chn, L) == 0)
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_channel_dup));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_dup, TICK_ETERNITY));
return 1;
}
@ -1957,7 +1980,7 @@ __LJMP static int hlua_channel_get(lua_State *L)
chn = MAY_LJMP(hlua_checkchannel(L, 1));
ret = _hlua_channel_dup(chn, L);
if (unlikely(ret == 0))
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_channel_get));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_get, TICK_ETERNITY));
if (unlikely(ret == -1))
return 1;
@ -1987,7 +2010,7 @@ __LJMP static int hlua_channel_getline(lua_State *L)
ret = bi_getline_nc(chn->chn, &blk1, &len1, &blk2, &len2);
if (ret == 0)
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_channel_getline));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_getline, TICK_ETERNITY));
if (ret == -1) {
lua_pushnil(L);
@ -2032,7 +2055,7 @@ __LJMP static int _hlua_channel_append(lua_State *L)
return 1;
}
if (ret == -1)
WILL_LJMP(lua_yieldk(L, 0, 0, _hlua_channel_append));
WILL_LJMP(hlua_yieldk(L, 0, 0, _hlua_channel_append, TICK_ETERNITY));
l += ret;
lua_pop(L, 1);
lua_pushinteger(L, l);
@ -2046,7 +2069,7 @@ __LJMP static int _hlua_channel_append(lua_State *L)
return 1;
}
if (l < len)
WILL_LJMP(lua_yieldk(L, 0, 0, _hlua_channel_append));
WILL_LJMP(hlua_yieldk(L, 0, 0, _hlua_channel_append, TICK_ETERNITY));
return 1;
}
@ -2122,7 +2145,7 @@ __LJMP static int _hlua_channel_send(lua_State *L)
return 1;
}
if (l < len)
WILL_LJMP(lua_yieldk(L, 0, 0, _hlua_channel_send));
WILL_LJMP(hlua_yieldk(L, 0, 0, _hlua_channel_send, TICK_ETERNITY));
return 1;
}
@ -2175,7 +2198,7 @@ __LJMP static int hlua_channel_forward_yield(lua_State *L)
return 1;
/* Otherwise, we can yield waiting for new data in the inpout side. */
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_channel_forward_yield));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_forward_yield, TICK_ETERNITY));
}
return 1;
@ -2497,7 +2520,7 @@ __LJMP static int hlua_sleep_yield(lua_State *L)
{
int wakeup_ms = lua_tointeger(L, -1);
if (now_ms < wakeup_ms)
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_sleep_yield));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, TICK_ETERNITY));
return 0;
}
@ -2536,7 +2559,7 @@ __LJMP static inline int _hlua_sleep(lua_State *L, int delay)
/* Store the wakeup time in the lua stack. */
lua_pushinteger(L, t->wakeup_ms);
WILL_LJMP(lua_yieldk(L, 0, 0, hlua_sleep_yield));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, TICK_ETERNITY));
return 0;
}
@ -2634,7 +2657,9 @@ static struct task *hlua_process_task(struct task *task)
task_free(task);
break;
case HLUA_E_AGAIN: /* co process wake me later. */
case HLUA_E_AGAIN: /* co process or timeout wake me later. */
if (hlua->wake_time != TICK_ETERNITY)
task_schedule(task, hlua->wake_time);
break;
/* finished with error. */
@ -3178,6 +3203,13 @@ static int hlua_request_act_wrapper(struct hlua_rule *rule, struct proxy *px,
/* yield. */
case HLUA_E_AGAIN:
/* Set timeout in the required channel. */
if (s->hlua.wake_time != TICK_ETERNITY) {
if (analyzer & (AN_REQ_INSPECT_FE|AN_REQ_HTTP_PROCESS_FE))
s->req->analyse_exp = s->hlua.wake_time;
else if (analyzer & (AN_RES_INSPECT|AN_RES_HTTP_PROCESS_BE))
s->rep->analyse_exp = s->hlua.wake_time;
}
/* Some actions can be wake up when a "write" event
* is detected on a response channel. This is useful
* only for actions targetted on the requests.