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samples: net: sockets: http_server: Dont block system workq

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Since the netstats handler calls on functions which reach deep into the
networking stack, there is a lot of points actually at which it can be
blocked, even forever. So having this handler on the system workqueue is
not a good idea and can even cause a deadlock in some cases if it's
blocked waiting on a synchronization primitive that would be given by a
work item scheduled later in the queue. Therefore, make a workqueue
specifically for this http server socket instead of using the system
one.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>
This commit is contained in:
Declan Snyder 2025-07-22 14:50:35 -05:00 committed by Chris Friedt
parent 1187e172b2
commit fb0ca1653f
1 changed files with 12 additions and 2 deletions
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14
samples/net/sockets/http_server/src/ws.c
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@ -251,6 +251,10 @@ static int netstats_collect(char *buf, size_t maxlen)
return ret;
}
#define WS_NETSTATS_STACK_SIZE 2048
K_THREAD_STACK_DEFINE(ws_netstats_stack, WS_NETSTATS_STACK_SIZE);
struct k_work_q ws_netstats_queue;
static void netstats_handler(struct k_work *work)
{
int ret;
@ -271,7 +275,8 @@ static void netstats_handler(struct k_work *work)
goto unregister;
}
ret = k_work_reschedule(&ctx->work, K_MSEC(CONFIG_NET_SAMPLE_WEBSOCKET_STATS_INTERVAL));
ret = k_work_reschedule_for_queue(&ws_netstats_queue, &ctx->work,
K_MSEC(CONFIG_NET_SAMPLE_WEBSOCKET_STATS_INTERVAL));
if (ret < 0) {
LOG_ERR("Failed to schedule netstats work, err %d", ret);
goto unregister;
@ -286,6 +291,11 @@ unregister:
int ws_netstats_init(void)
{
struct k_work_queue_config cfg = {.name = "ws_netstats_q"};
k_work_queue_init(&ws_netstats_queue);
k_work_queue_start(&ws_netstats_queue, ws_netstats_stack, WS_NETSTATS_STACK_SIZE, 0, &cfg);
for (int i = 0; i < CONFIG_NET_SAMPLE_NUM_WEBSOCKET_HANDLERS; i++) {
netstats_ctx[i].sock = -1;
k_work_init_delayable(&netstats_ctx[i].work, netstats_handler);
@ -344,7 +354,7 @@ int ws_netstats_setup(int ws_socket, struct http_request_ctx *request_ctx, void
netstats_ctx[slot].sock = ws_socket;
ret = k_work_reschedule(&netstats_ctx[slot].work, K_NO_WAIT);
ret = k_work_reschedule_for_queue(&ws_netstats_queue, &netstats_ctx[slot].work, K_NO_WAIT);
if (ret < 0) {
LOG_ERR("Failed to schedule netstats work, err %d", ret);
return ret;