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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*/
/* This programme shows the effects of 'heavy' long-running functions
* on the cooperative threading model.
*
* Run it with a config file containing 'password whatever', telnet to it
* (it defaults to port 4000) and enter the 'clear foo string' command.
* then type whatever and observe that the vty interface is unresponsive
* for quite a period of time, due to the clear_something command
* taking a very long time to complete.
*/
#include <zebra.h>
#include "event.h"
#include "vty.h"
#include "command.h"
#include "memory.h"
#include "log.h"
#include "workqueue.h"
#include <math.h>
#include "tests.h"
DEFINE_MGROUP(TEST_HEAVYWQ, "heavy-wq test");
DEFINE_MTYPE_STATIC(TEST_HEAVYWQ, WQ_NODE, "heavy_wq_node");
DEFINE_MTYPE_STATIC(TEST_HEAVYWQ, WQ_NODE_STR, "heavy_wq_node->str");
extern struct thread_master *master;
static struct work_queue *heavy_wq;
struct heavy_wq_node {
char *str;
int i;
};
enum { ITERS_FIRST = 0,
ITERS_ERR = 100,
ITERS_LATER = 400,
ITERS_PRINT = 10,
ITERS_MAX = 1000,
};
static void heavy_wq_add(struct vty *vty, const char *str, int i)
{
struct heavy_wq_node *hn;
hn = XCALLOC(MTYPE_WQ_NODE, sizeof(struct heavy_wq_node));
hn->i = i;
hn->str = XSTRDUP(MTYPE_WQ_NODE_STR, str);
work_queue_add(heavy_wq, hn);
return;
}
static void slow_func_del(struct work_queue *wq, void *data)
{
struct heavy_wq_node *hn = data;
assert(hn && hn->str);
printf("%s: %s\n", __func__, hn->str);
XFREE(MTYPE_WQ_NODE_STR, hn->str);
XFREE(MTYPE_WQ_NODE, hn);
}
static wq_item_status slow_func(struct work_queue *wq, void *data)
{
struct heavy_wq_node *hn = data;
double x = 1;
int j;
assert(hn && hn->str);
for (j = 0; j < 300; j++)
x += sin(x) * j;
if ((hn->i % ITERS_LATER) == 0)
return WQ_RETRY_LATER;
if ((hn->i % ITERS_ERR) == 0)
return WQ_RETRY_NOW;
if ((hn->i % ITERS_PRINT) == 0)
printf("%s did %d, x = %g\n", hn->str, hn->i, x);
return WQ_SUCCESS;
}
static void clear_something(struct vty *vty, const char *str)
{
int i;
/* this could be like iterating through 150k of route_table
* or worse, iterating through a list of peers, to bgp_stop them with
* each having 150k route tables to process...
*/
for (i = ITERS_FIRST; i < ITERS_MAX; i++)
heavy_wq_add(vty, str, i);
}
DEFUN (clear_foo,
clear_foo_cmd,
"clear foo LINE...",
"clear command\n"
"arbitrary string\n")
{
char *str;
if (!argc) {
vty_out(vty, "%% string argument required\n");
return CMD_WARNING;
}
str = argv_concat(argv, argc, 0);
clear_something(vty, str);
XFREE(MTYPE_TMP, str);
return CMD_SUCCESS;
}
static int heavy_wq_init(void)
{
heavy_wq = work_queue_new(master, "heavy_work_queue");
heavy_wq->spec.workfunc = &slow_func;
heavy_wq->spec.del_item_data = &slow_func_del;
heavy_wq->spec.max_retries = 3;
heavy_wq->spec.hold = 1000;
return 0;
}
void test_init(void)
{
install_element(VIEW_NODE, &clear_foo_cmd);
heavy_wq_init();
}
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