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taskwdt fixes: better handling of empty/emptying wdt task list, lock task struct while feeding

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This commit is contained in:
Jeroen Domburg 2016-11-16 17:53:50 +08:00
parent d1fc5fe432
commit a023b005c6
1 changed files with 31 additions and 1 deletions
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32
components/esp32/task_wdt.c
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@ -22,6 +22,8 @@
#include "sdkconfig.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/queue.h"
#include "freertos/semphr.h"
#include <esp_types.h>
#include "esp_err.h"
#include "esp_intr.h"
@ -45,6 +47,7 @@ struct wdt_task_t {
};
static wdt_task_t *wdt_task_list=NULL;
static portMUX_TYPE taskwdt_spinlock = portMUX_INITIALIZER_UNLOCKED;
static void IRAM_ATTR task_wdt_isr(void *arg) {
wdt_task_t *wdttask;
@ -55,13 +58,23 @@ static void IRAM_ATTR task_wdt_isr(void *arg) {
TIMERG0.wdt_wprotect=0;
//Ack interrupt
TIMERG0.int_clr_timers.wdt=1;
//We are taking a spinlock while doing I/O (ets_printf) here. Normally, that is a pretty
//bad thing, possibly (temporarily) hanging up the 2nd core and stopping FreeRTOS. In this case,
//something bad already happened and reporting this is considered more important
//than the badness caused by a spinlock here.
portENTER_CRITICAL(&taskwdt_spinlock);
if (!wdt_task_list) {
//No task on list. Maybe none registered yet.
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
}
//Watchdog got triggered because at least one task did not report in.
ets_printf("Task watchdog got triggered. The following tasks did not feed the watchdog in time:\n");
for (wdttask=wdt_task_list; wdttask!=NULL; wdttask=wdttask->next) {
if (!wdttask->fed_watchdog) {
cpu=xTaskGetAffinity(wdttask->task_handle)==0?"CPU 0":"CPU 1";
if (xTaskGetAffinity(wdttask->task_handle)==tskNO_AFFINITY) cpu="CPU 0/1";
printf(" - %s (%s)\n", pcTaskGetTaskName(wdttask->task_handle), cpu);
ets_printf(" - %s (%s)\n", pcTaskGetTaskName(wdttask->task_handle), cpu);
}
}
ets_printf("Tasks currently running:\n");
@ -73,6 +86,7 @@ static void IRAM_ATTR task_wdt_isr(void *arg) {
ets_printf("Aborting.\n");
abort();
#endif
portEXIT_CRITICAL(&taskwdt_spinlock);
}
@ -80,6 +94,8 @@ void esp_task_wdt_feed() {
wdt_task_t *wdttask=wdt_task_list;
bool found_task=false, do_feed_wdt=true;
TaskHandle_t handle=xTaskGetCurrentTaskHandle();
portENTER_CRITICAL(&taskwdt_spinlock);
//Walk the linked list of wdt tasks to find this one, as well as see if we need to feed
//the real watchdog timer.
for (wdttask=wdt_task_list; wdttask!=NULL; wdttask=wdttask->next) {
@ -114,14 +130,18 @@ void esp_task_wdt_feed() {
//Reset fed_watchdog status
for (wdttask=wdt_task_list; wdttask->next!=NULL; wdttask=wdttask->next) wdttask->fed_watchdog=false;
}
portEXIT_CRITICAL(&taskwdt_spinlock);
}
void esp_task_wdt_delete() {
TaskHandle_t handle=xTaskGetCurrentTaskHandle();
wdt_task_t *wdttask=wdt_task_list;
portENTER_CRITICAL(&taskwdt_spinlock);
//Wdt task list can't be empty
if (!wdt_task_list) {
ESP_LOGE(TAG, "task_wdt_delete: No tasks in list?");
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
}
if (handle==wdt_task_list) {
@ -130,15 +150,25 @@ void esp_task_wdt_delete() {
free(wdttask);
} else {
//Find current task in list
if (wdt_task_list->task_handle==handle) {
//Task is the very first one.
wdt_task_t *freeme=wdt_task_list;
wdt_task_list=wdt_task_list->next;
free(freeme);
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
}
while (wdttask->next!=NULL && wdttask->next->task_handle!=handle) wdttask=wdttask->next;
if (!wdttask->next) {
ESP_LOGE(TAG, "task_wdt_delete: Task never called task_wdt_feed!");
portEXIT_CRITICAL(&taskwdt_spinlock);
return;
}
wdt_task_t *freeme=wdttask->next;
wdttask->next=wdttask->next->next;
free(freeme);
}
portEXIT_CRITICAL(&taskwdt_spinlock);
}