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esp_timer: handle esp_timer_delete in timer task
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Closes #3458
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@igrr @espressif-bot
igrr authored and espressif-bot committed Nov 5, 2019
1 parent b8243b5 commit 0100769
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Showing 2 changed files with 74 additions and 44 deletions.
63 changes: 19 additions & 44 deletions components/esp32/esp_timer.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -38,12 +38,17 @@
#endif
#include "rom/queue.h"

#define EVENT_ID_DELETE_TIMER 0xF0DE1E1E

#define TIMER_EVENT_QUEUE_SIZE 16

struct esp_timer {
uint64_t alarm;
uint64_t period;
esp_timer_cb_t callback;
union {
esp_timer_cb_t callback;
uint32_t event_id;
};
void* arg;
#if WITH_PROFILING
const char* name;
Expand Down Expand Up @@ -76,23 +81,18 @@ static LIST_HEAD(esp_timer_list, esp_timer) s_timers =
// all the timers
static LIST_HEAD(esp_inactive_timer_list, esp_timer) s_inactive_timers =
LIST_HEAD_INITIALIZER(s_timers);
// used to keep track of the timer when executing the callback
static esp_timer_handle_t s_timer_in_callback;
#endif
// task used to dispatch timer callbacks
static TaskHandle_t s_timer_task;
// counting semaphore used to notify the timer task from ISR
static SemaphoreHandle_t s_timer_semaphore;
// mutex which protects timers from deletion during callback execution
static SemaphoreHandle_t s_timer_delete_mutex;

#if CONFIG_SPIRAM_USE_MALLOC
// memory for s_timer_semaphore and s_timer_delete_mutex
// memory for s_timer_semaphore
static StaticQueue_t s_timer_semaphore_memory;
static StaticQueue_t s_timer_delete_mutex_memory;
#endif

// lock protecting s_timers, s_inactive_timers, s_timer_in_callback
// lock protecting s_timers, s_inactive_timers
static portMUX_TYPE s_timer_lock = portMUX_INITIALIZER_UNLOCKED;


Expand Down Expand Up @@ -163,15 +163,10 @@ esp_err_t esp_timer_delete(esp_timer_handle_t timer)
if (timer_armed(timer)) {
return ESP_ERR_INVALID_STATE;
}
xSemaphoreTakeRecursive(s_timer_delete_mutex, portMAX_DELAY);
#if WITH_PROFILING
if (timer == s_timer_in_callback) {
s_timer_in_callback = NULL;
}
timer_remove_inactive(timer);
#endif
free(timer);
xSemaphoreGiveRecursive(s_timer_delete_mutex);
timer->event_id = EVENT_ID_DELETE_TIMER;
timer->alarm = esp_timer_get_time() + 50;
timer->period = 0;
timer_insert(timer);
return ESP_OK;
}

Expand Down Expand Up @@ -266,13 +261,17 @@ static void timer_process_alarm(esp_timer_dispatch_t dispatch_method)
/* unused, provision to allow running callbacks from ISR */
(void) dispatch_method;

xSemaphoreTakeRecursive(s_timer_delete_mutex, portMAX_DELAY);
timer_list_lock();
uint64_t now = esp_timer_impl_get_time();
esp_timer_handle_t it = LIST_FIRST(&s_timers);
while (it != NULL &&
it->alarm < now) {
LIST_REMOVE(it, list_entry);
if (it->event_id == EVENT_ID_DELETE_TIMER) {
free(it);
it = LIST_FIRST(&s_timers);
continue;
}
if (it->period > 0) {
it->alarm += it->period;
timer_insert(it);
Expand All @@ -284,21 +283,14 @@ static void timer_process_alarm(esp_timer_dispatch_t dispatch_method)
}
#if WITH_PROFILING
uint64_t callback_start = now;
s_timer_in_callback = it;
#endif
timer_list_unlock();
(*it->callback)(it->arg);
timer_list_lock();
now = esp_timer_impl_get_time();
#if WITH_PROFILING
/* The callback might have deleted the timer.
* If this happens, esp_timer_delete will set s_timer_in_callback
* to NULL.
*/
if (s_timer_in_callback) {
s_timer_in_callback->times_triggered++;
s_timer_in_callback->total_callback_run_time += now - callback_start;
}
it->times_triggered++;
it->total_callback_run_time += now - callback_start;
#endif
it = LIST_FIRST(&s_timers);
}
Expand All @@ -307,7 +299,6 @@ static void timer_process_alarm(esp_timer_dispatch_t dispatch_method)
esp_timer_impl_set_alarm(first->alarm);
}
timer_list_unlock();
xSemaphoreGiveRecursive(s_timer_delete_mutex);
}

static void timer_task(void* arg)
Expand Down Expand Up @@ -355,18 +346,6 @@ esp_err_t esp_timer_init(void)
goto out;
}

#if CONFIG_SPIRAM_USE_MALLOC
memset(&s_timer_delete_mutex_memory, 0, sizeof(StaticQueue_t));
s_timer_delete_mutex = xSemaphoreCreateRecursiveMutexStatic(&s_timer_delete_mutex_memory);
#else
s_timer_delete_mutex = xSemaphoreCreateRecursiveMutex();
#endif
if (!s_timer_delete_mutex) {
err = ESP_ERR_NO_MEM;
goto out;
}


int ret = xTaskCreatePinnedToCore(&timer_task, "esp_timer",
ESP_TASK_TIMER_STACK, NULL, ESP_TASK_TIMER_PRIO, &s_timer_task, PRO_CPU_NUM);
if (ret != pdPASS) {
Expand All @@ -390,10 +369,6 @@ esp_err_t esp_timer_init(void)
vSemaphoreDelete(s_timer_semaphore);
s_timer_semaphore = NULL;
}
if (s_timer_delete_mutex) {
vSemaphoreDelete(s_timer_delete_mutex);
s_timer_delete_mutex = NULL;
}
return ESP_ERR_NO_MEM;
}

Expand Down
55 changes: 55 additions & 0 deletions components/esp32/test/test_esp_timer.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -536,6 +536,61 @@ TEST_CASE("Can delete timer from callback", "[esp_timer]")
vSemaphoreDelete(args.notify_from_timer_cb);
}


typedef struct {
SemaphoreHandle_t delete_start;
SemaphoreHandle_t delete_done;
SemaphoreHandle_t test_done;
esp_timer_handle_t timer;
} timer_delete_test_args_t;

static void timer_delete_task(void* arg)
{
timer_delete_test_args_t* args = (timer_delete_test_args_t*) arg;
xSemaphoreTake(args->delete_start, portMAX_DELAY);
printf("Deleting the timer\n");
esp_timer_delete(args->timer);
printf("Timer deleted\n");
xSemaphoreGive(args->delete_done);
vTaskDelete(NULL);
}

static void timer_delete_test_callback(void* arg)
{
timer_delete_test_args_t* args = (timer_delete_test_args_t*) arg;
printf("Timer callback called\n");
xSemaphoreGive(args->delete_start);
xSemaphoreTake(args->delete_done, portMAX_DELAY);
printf("Callback complete\n");
xSemaphoreGive(args->test_done);
}

TEST_CASE("Can delete timer from a separate task, triggered from callback", "[esp_timer]")
{
timer_delete_test_args_t args = {
.delete_start = xSemaphoreCreateBinary(),
.delete_done = xSemaphoreCreateBinary(),
.test_done = xSemaphoreCreateBinary(),
};

esp_timer_create_args_t timer_args = {
.callback = &timer_delete_test_callback,
.arg = &args
};
esp_timer_handle_t timer;
TEST_ESP_OK(esp_timer_create(&timer_args, &timer));
args.timer = timer;

xTaskCreate(timer_delete_task, "deleter", 4096, &args, 5, NULL);

esp_timer_start_once(timer, 100);
TEST_ASSERT(xSemaphoreTake(args.test_done, pdMS_TO_TICKS(1000)));

vSemaphoreDelete(args.delete_done);
vSemaphoreDelete(args.delete_start);
vSemaphoreDelete(args.test_done);
}

TEST_CASE("esp_timer_impl_advance moves time base correctly", "[esp_timer]")
{
ref_clock_init();
Expand Down

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