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/*
* Event loop based on select() loop
* Copyright (c) 2002-2009, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
/*
* SPDX-FileCopyrightText: 2022-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "includes.h"
#include "common.h"
#include "list.h"
#include "eloop.h"
#include "esp_wifi_driver.h"
struct eloop_timeout {
struct dl_list list;
struct os_reltime time;
void *eloop_data;
void *user_data;
eloop_timeout_handler handler;
#ifdef ELOOP_DEBUG
char func_name[100];
int line;
#endif
};
struct eloop_data {
struct dl_list timeout;
ETSTimer eloop_timer;
bool eloop_started;
};
#define ELOOP_LOCK() os_mutex_lock(eloop_data_lock)
#define ELOOP_UNLOCK() os_mutex_unlock(eloop_data_lock)
static void *eloop_data_lock = NULL;
static struct eloop_data eloop;
static int eloop_run_wrapper(void *data)
{
eloop_run();
return 0;
}
static void eloop_run_timer(void *args)
{
/* Execute timers in pptask context to make it thread safe */
wifi_ipc_config_t cfg;
cfg.fn = eloop_run_wrapper;
cfg.arg = NULL;
cfg.arg_size = 0;
esp_wifi_ipc_internal(&cfg, false);
}
int eloop_init(void)
{
os_memset(&eloop, 0, sizeof(eloop));
dl_list_init(&eloop.timeout);
os_timer_disarm(&eloop.eloop_timer);
os_timer_setfn(&eloop.eloop_timer, (ETSTimerFunc *)eloop_run_timer, NULL);
eloop_data_lock = os_recursive_mutex_create();
if (!eloop_data_lock) {
wpa_printf(MSG_ERROR, "failed to create eloop data loop");
return -1;
}
eloop.eloop_started = true;
return 0;
}
#ifdef ELOOP_DEBUG
int eloop_register_timeout_debug(unsigned int secs, unsigned int usecs,
eloop_timeout_handler handler, void *eloop_data,
void *user_data, const char *func, int line)
#else
int eloop_register_timeout(unsigned int secs, unsigned int usecs,
eloop_timeout_handler handler,
void *eloop_data, void *user_data)
#endif
{
struct eloop_timeout *timeout, *tmp;
os_time_t now_sec;
#ifdef ELOOP_DEBUG
int count = 0;
#endif
timeout = os_zalloc(sizeof(*timeout));
if (timeout == NULL) {
return -1;
}
if (os_get_reltime(&timeout->time) < 0) {
os_free(timeout);
return -1;
}
now_sec = timeout->time.sec;
timeout->time.sec += secs;
if (timeout->time.sec < now_sec) {
goto overflow;
}
timeout->time.usec += usecs;
while (timeout->time.usec >= 1000000) {
timeout->time.sec++;
timeout->time.usec -= 1000000;
}
if (timeout->time.sec < now_sec) {
goto overflow;
}
timeout->eloop_data = eloop_data;
timeout->user_data = user_data;
timeout->handler = handler;
#ifdef ELOOP_DEBUG
os_strlcpy(timeout->func_name, func, 100);
timeout->line = line;
#endif
/* Maintain timeouts in order of increasing time */
dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) {
if (os_reltime_before(&timeout->time, &tmp->time)) {
ELOOP_LOCK();
dl_list_add(tmp->list.prev, &timeout->list);
ELOOP_UNLOCK();
goto run;
}
#ifdef ELOOP_DEBUG
count++;
#endif
}
ELOOP_LOCK();
dl_list_add_tail(&eloop.timeout, &timeout->list);
ELOOP_UNLOCK();
run:
#ifdef ELOOP_DEBUG
wpa_printf(MSG_DEBUG, "ELOOP: Added one timer from %s:%d to call %p, current order=%d",
timeout->func_name, line, timeout->handler, count);
#endif
ELOOP_LOCK();
os_timer_disarm(&eloop.eloop_timer);
os_timer_arm(&eloop.eloop_timer, 0, 0);
ELOOP_UNLOCK();
return 0;
overflow:
/*
* Integer overflow - assume long enough timeout to be assumed
* to be infinite, i.e., the timeout would never happen.
*/
wpa_printf(MSG_DEBUG,
"ELOOP: Too long timeout (secs=%u usecs=%u) to ever happen - ignore it",
secs, usecs);
os_free(timeout);
return 0;
}
static bool timeout_exists(struct eloop_timeout *old)
{
struct eloop_timeout *timeout, *prev;
dl_list_for_each_safe(timeout, prev, &eloop.timeout,
struct eloop_timeout, list) {
if (old == timeout) {
return true;
}
}
return false;
}
static void eloop_remove_timeout(struct eloop_timeout *timeout)
{
bool timeout_present = false;
ELOOP_LOCK();
/* Make sure timeout still exists(Another context may have deleted this) */
timeout_present = timeout_exists(timeout);
if (timeout_present) {
dl_list_del(&timeout->list);
}
ELOOP_UNLOCK();
if (timeout_present) {
os_free(timeout);
}
}
#ifdef ELOOP_DEBUG
int eloop_cancel_timeout_debug(eloop_timeout_handler handler, void *eloop_data,
void *user_data, const char *func, int line)
#else
int eloop_cancel_timeout(eloop_timeout_handler handler,
void *eloop_data, void *user_data)
#endif
{
struct eloop_timeout *timeout, *prev;
int removed = 0;
dl_list_for_each_safe(timeout, prev, &eloop.timeout,
struct eloop_timeout, list) {
if (timeout->handler == handler &&
(timeout->eloop_data == eloop_data ||
eloop_data == ELOOP_ALL_CTX) &&
(timeout->user_data == user_data ||
user_data == ELOOP_ALL_CTX)) {
eloop_remove_timeout(timeout);
removed++;
}
}
#ifdef ELOOP_DEBUG
wpa_printf(MSG_DEBUG, "ELOOP: %s:%d called to remove timer handler=%p, removed count=%d",
func, line, handler, removed);
#endif
return removed;
}
int eloop_cancel_timeout_one(eloop_timeout_handler handler,
void *eloop_data, void *user_data,
struct os_reltime *remaining)
{
struct eloop_timeout *timeout, *prev;
int removed = 0;
struct os_reltime now;
os_get_reltime(&now);
remaining->sec = remaining->usec = 0;
dl_list_for_each_safe(timeout, prev, &eloop.timeout,
struct eloop_timeout, list) {
if (timeout->handler == handler &&
(timeout->eloop_data == eloop_data) &&
(timeout->user_data == user_data)) {
removed = 1;
if (os_reltime_before(&now, &timeout->time)) {
os_reltime_sub(&timeout->time, &now, remaining);
}
eloop_remove_timeout(timeout);
break;
}
}
return removed;
}
int eloop_is_timeout_registered(eloop_timeout_handler handler,
void *eloop_data, void *user_data)
{
struct eloop_timeout *tmp;
dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) {
if (tmp->handler == handler &&
tmp->eloop_data == eloop_data &&
tmp->user_data == user_data) {
return 1;
}
}
return 0;
}
int eloop_deplete_timeout(unsigned int req_secs, unsigned int req_usecs,
eloop_timeout_handler handler, void *eloop_data,
void *user_data)
{
struct os_reltime now, requested, remaining;
struct eloop_timeout *tmp;
dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) {
if (tmp->handler == handler &&
tmp->eloop_data == eloop_data &&
tmp->user_data == user_data) {
requested.sec = req_secs;
requested.usec = req_usecs;
os_get_reltime(&now);
os_reltime_sub(&tmp->time, &now, &remaining);
if (os_reltime_before(&requested, &remaining)) {
eloop_cancel_timeout(handler, eloop_data,
user_data);
eloop_register_timeout(requested.sec,
requested.usec,
handler, eloop_data,
user_data);
return 1;
}
return 0;
}
}
return -1;
}
int eloop_replenish_timeout(unsigned int req_secs, unsigned int req_usecs,
eloop_timeout_handler handler, void *eloop_data,
void *user_data)
{
struct os_reltime now, requested, remaining;
struct eloop_timeout *tmp;
dl_list_for_each(tmp, &eloop.timeout, struct eloop_timeout, list) {
if (tmp->handler == handler &&
tmp->eloop_data == eloop_data &&
tmp->user_data == user_data) {
requested.sec = req_secs;
requested.usec = req_usecs;
os_get_reltime(&now);
os_reltime_sub(&tmp->time, &now, &remaining);
if (os_reltime_before(&remaining, &requested)) {
eloop_cancel_timeout(handler, eloop_data,
user_data);
eloop_register_timeout(requested.sec,
requested.usec,
handler, eloop_data,
user_data);
return 1;
}
return 0;
}
}
return -1;
}
void eloop_run(void)
{
struct os_reltime tv, now;
while (!dl_list_empty(&eloop.timeout)) {
struct eloop_timeout *timeout;
timeout = dl_list_first(&eloop.timeout, struct eloop_timeout,
list);
if (timeout) {
os_get_reltime(&now);
if (os_reltime_before(&now, &timeout->time)) {
/* we don't need to process it rn, do it later */
uint32_t ms;
os_reltime_sub(&timeout->time, &now, &tv);
ms = tv.sec * 1000 + tv.usec / 1000;
ELOOP_LOCK();
os_timer_disarm(&eloop.eloop_timer);
os_timer_arm(&eloop.eloop_timer, ms, 0);
ELOOP_UNLOCK();
goto out;
}
}
/* check if some registered timeouts have occurred */
timeout = dl_list_first(&eloop.timeout, struct eloop_timeout,
list);
if (timeout) {
os_get_reltime(&now);
if (!os_reltime_before(&now, &timeout->time)) {
void *eloop_data = timeout->eloop_data;
void *user_data = timeout->user_data;
eloop_timeout_handler handler =
timeout->handler;
#ifdef ELOOP_DEBUG
char fn_name[100] = {0};
int line = timeout->line;
os_strlcpy(fn_name, timeout->func_name, 100);
#endif
eloop_remove_timeout(timeout);
#ifdef ELOOP_DEBUG
wpa_printf(MSG_DEBUG, "ELOOP: Running timer fn:%p scheduled by %s:%d ",
handler, fn_name, line);
#endif
handler(eloop_data, user_data);
}
}
}
out:
return;
}
void eloop_destroy(void)
{
struct eloop_timeout *timeout, *prev;
struct os_reltime now;
if (!eloop.eloop_started) {
return;
}
os_get_reltime(&now);
dl_list_for_each_safe(timeout, prev, &eloop.timeout,
struct eloop_timeout, list) {
int sec, usec;
sec = timeout->time.sec - now.sec;
usec = timeout->time.usec - now.usec;
if (timeout->time.usec < now.usec) {
sec--;
usec += 1000000;
}
wpa_printf(MSG_INFO, "ELOOP: remaining timeout: %d.%06d "
"eloop_data=%p user_data=%p handler=%p",
sec, usec, timeout->eloop_data, timeout->user_data,
timeout->handler);
eloop_remove_timeout(timeout);
}
if (eloop_data_lock) {
os_mutex_delete(eloop_data_lock);
eloop_data_lock = NULL;
}
os_timer_disarm(&eloop.eloop_timer);
os_timer_done(&eloop.eloop_timer);
os_memset(&eloop, 0, sizeof(eloop));
}
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