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[esp_event]: fixed and improved docs

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* Description of unregistering was incorrect
* Made clear that event loop arg mustn't be NULL
* Added parameter check in create function

Closes https://github.com/espressif/esp-idf/issues/6761
Closes IDFGH-4969
This commit is contained in:
Jakob Hasse 2021-07-06 17:19:20 +08:00
parent fb3b6e0094
commit 352fb9168a
3 changed files with 41 additions and 24 deletions
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10
components/esp_event/esp_event.c
View File

@ -410,7 +410,15 @@ static void post_instance_delete(esp_event_post_instance_t* post)
esp_err_t esp_event_loop_create(const esp_event_loop_args_t* event_loop_args, esp_event_loop_handle_t* event_loop)
{
assert(event_loop_args);
if (event_loop_args == NULL) {
ESP_LOGE(TAG, "event_loop_args was NULL");
return ESP_ERR_INVALID_ARG;
}
if (event_loop == NULL) {
ESP_LOGE(TAG, "event_loop was NULL");
return ESP_ERR_INVALID_ARG;
}
esp_event_loop_instance_t* loop;
esp_err_t err = ESP_ERR_NO_MEM; // most likely error

35
components/esp_event/include/esp_event.h
View File

@ -49,6 +49,7 @@ typedef struct {
*
* @return
* - ESP_OK: Success
* - ESP_ERR_INVALID_ARG: event_loop_args or event_loop was NULL
* - ESP_ERR_NO_MEM: Cannot allocate memory for event loops list
* - ESP_FAIL: Failed to create task loop
* - Others: Fail
@ -58,7 +59,7 @@ esp_err_t esp_event_loop_create(const esp_event_loop_args_t* event_loop_args, es
/**
* @brief Delete an existing event loop.
*
* @param[in] event_loop event loop to delete
* @param[in] event_loop event loop to delete, must not be NULL
*
* @return
* - ESP_OK: Success
@ -103,7 +104,7 @@ esp_err_t esp_event_loop_delete_default();
* In cases where waiting on the queue times out, ESP_OK is returned and not ESP_ERR_TIMEOUT, since it is
* normal behavior.
*
* @param[in] event_loop event loop to dispatch posted events from
* @param[in] event_loop event loop to dispatch posted events from, must not be NULL
* @param[in] ticks_to_run number of ticks to run the loop
*
* @note encountering an unknown event that has been posted to the loop will only generate a warning, not an error.
@ -153,7 +154,7 @@ esp_err_t esp_event_handler_register(esp_event_base_t event_base,
* This function behaves in the same manner as esp_event_handler_register, except the additional
* specification of the event loop to register the handler to.
*
* @param[in] event_loop the event loop to register this handler function to
* @param[in] event_loop the event loop to register this handler function to, must not be NULL
* @param[in] event_base the base id of the event to register the handler for
* @param[in] event_id the id of the event to register the handler for
* @param[in] event_handler the handler function which gets called when the event is dispatched
@ -169,23 +170,23 @@ esp_err_t esp_event_handler_register(esp_event_base_t event_base,
* - Others: Fail
*/
esp_err_t esp_event_handler_register_with(esp_event_loop_handle_t event_loop,
esp_event_base_t event_base,
int32_t event_id,
esp_event_handler_t event_handler,
void* event_handler_arg);
esp_event_base_t event_base,
int32_t event_id,
esp_event_handler_t event_handler,
void *event_handler_arg);
/**
* @brief Unregister a handler with the system event loop.
*
* This function can be used to unregister a handler so that it no longer gets called during dispatch.
* Handlers can be unregistered for either: (1) specific events, (2) all events of a certain event base,
* or (3) all events known by the system event loop
* Unregisters a handler so it will no longer be called during dispatch.
* Handlers can be unregistered for any combination of event_base and event_id which were previously registered.
* To unregister a handler, the event_base and event_id arguments must match exactly the arguments passed to
* esp_event_handler_register() when that handler was registered. Passing ESP_EVENT_ANY_BASE and/or ESP_EVENT_ANY_ID
* will only unregister handlers that were registered with the same wildcard arguments.
*
* - specific events: specify exact event_base and event_id
* - all events of a certain base: specify exact event_base and use ESP_EVENT_ANY_ID as the event_id
* - all events known by the loop: use ESP_EVENT_ANY_BASE for event_base and ESP_EVENT_ANY_ID as the event_id
*
* This function ignores unregistration of handlers that has not been previously registered.
* @note When using ESP_EVENT_ANY_ID, handlers registered to specific event IDs using the same base will not be
* unregistered. When using ESP_EVENT_ANY_BASE, events registered to specific bases will also not be
* unregistered. This avoids accidental unregistration of handlers registered by other users or components.
*
* @param[in] event_base the base of the event with which to unregister the handler
* @param[in] event_id the id of the event with which to unregister the handler
@ -203,7 +204,7 @@ esp_err_t esp_event_handler_unregister(esp_event_base_t event_base, int32_t even
* This function behaves in the same manner as esp_event_handler_unregister, except the additional specification of
* the event loop to unregister the handler with.
*
* @param[in] event_loop the event loop with which to unregister this handler function
* @param[in] event_loop the event loop with which to unregister this handler function, must not be NULL
* @param[in] event_base the base of the event with which to unregister the handler
* @param[in] event_id the id of the event with which to unregister the handler
* @param[in] event_handler the handler to unregister
@ -251,7 +252,7 @@ esp_err_t esp_event_post(esp_event_base_t event_base,
* This function behaves in the same manner as esp_event_post_to, except the additional specification of the event loop
* to post the event to.
*
* @param[in] event_loop the event loop to post to
* @param[in] event_loop the event loop to post to, must not be NULL
* @param[in] event_base the event base that identifies the event
* @param[in] event_id the the event id that identifies the event
* @param[in] event_data the data, specific to the event occurence, that gets passed to the handler

8
components/esp_event/test/test_event.c
View File

@ -283,6 +283,14 @@ static void test_teardown()
}
TEST_CASE("create and event loop with any NULL argument fails", "[event]")
{
esp_event_loop_handle_t loop; // with dedicated task
esp_event_loop_args_t loop_args = test_event_get_default_loop_args();
TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_event_loop_create(NULL, &loop));
TEST_ASSERT_EQUAL(ESP_ERR_INVALID_ARG, esp_event_loop_create(&loop_args, NULL));
}
TEST_CASE("can create and delete event loops", "[event]")
{
/* this test aims to verify that: