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Merge branch 'bugfix/fix_select_timeout_v4.4' into 'release/v4.4'

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VFS: `select` function's timeout is now POSIX compliant (and fix eventfd example) (backport v4.4)

See merge request espressif/esp-idf!16189
This commit is contained in:
Mahavir Jain 2021-12-08 08:32:42 +00:00
commit ff3922d217
6 changed files with 747 additions and 76 deletions
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21
components/vfs/include/esp_vfs.h
View File

@ -1,16 +1,8 @@
// Copyright 2015-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __ESP_VFS_H__
#define __ESP_VFS_H__
@ -410,7 +402,8 @@ int esp_vfs_utime(const char *path, const struct utimbuf *times);
* @param timeout If not NULL, then points to timeval structure which
* specifies the time period after which the functions should
* time-out and return. If it is NULL, then the function will
* not time-out.
* not time-out. Note that the timeout period is rounded up to
* the system tick and incremented by one.
*
* @return The number of descriptors set in the descriptor sets, or -1
* when an error (specified by errno) have occurred.

28
components/vfs/vfs.c
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@ -1,16 +1,8 @@
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
@ -1028,8 +1020,14 @@ int esp_vfs_select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *errorfds
TickType_t ticks_to_wait = portMAX_DELAY;
if (timeout) {
uint32_t timeout_ms = timeout->tv_sec * 1000 + timeout->tv_usec / 1000;
ticks_to_wait = timeout_ms / portTICK_PERIOD_MS;
uint32_t timeout_ms = (timeout->tv_sec * 1000) + (timeout->tv_usec / 1000);
/* Round up the number of ticks.
* Not only we need to round up the number of ticks, but we also need to add 1.
* Indeed, `select` function shall wait for AT LEAST timeout, but on FreeRTOS,
* if we specify a timeout of 1 tick to `xSemaphoreTake`, it will take AT MOST
* 1 tick before triggering a timeout. Thus, we need to pass 2 ticks as a timeout
* to `xSemaphoreTake`. */
ticks_to_wait = ((timeout_ms + portTICK_PERIOD_MS - 1) / portTICK_PERIOD_MS) + 1;
ESP_LOGD(TAG, "timeout is %dms", timeout_ms);
}
ESP_LOGD(TAG, "waiting without calling socket_select");

64
examples/system/eventfd/README.md
View File

@ -39,36 +39,36 @@ See the Getting Started Guide for full steps to configure and use ESP-IDF to bui
The following log output should appear when the example runs (note that the bootloader log has been omitted).
```
I (4310) eventfd_example: Time: 1.99s
I (4310) eventfd_example: Select timeout
I (4310) eventfd_example: =================================
I (4310) eventfd_example: Select timeouted for 1 times
I (4320) eventfd_example: Timer triggerred for 0 times
I (4320) eventfd_example: Progress triggerred for 0 times
I (4330) eventfd_example: =================================
I (4810) eventfd_example: Time: 2.50s
I (4810) eventfd_example: TimerEvent fd event triggered
I (5810) eventfd_example: Time: 3.49s
I (5810) eventfd_example: Progress fd event triggered
I (7310) eventfd_example: Time: 5.00s
I (7310) eventfd_example: TimerEvent fd event triggered
I (9310) eventfd_example: Time: 6.99s
I (9310) eventfd_example: Select timeout
I (9310) eventfd_example: Time: 6.99s
I (9310) eventfd_example: Progress fd event triggered
I (9810) eventfd_example: Time: 7.50s
I (9810) eventfd_example: TimerEvent fd event triggered
I (11810) eventfd_example: Time: 9.49s
I (11810) eventfd_example: Select timeout
I (12310) eventfd_example: Time: 10.00s
I (12310) eventfd_example: TimerEvent fd event triggered
I (12810) eventfd_example: Time: 10.49s
I (12810) eventfd_example: Progress fd event triggered
I (14810) eventfd_example: Time: 12.49s
I (14810) eventfd_example: Select timeout
I (14810) eventfd_example: =================================
I (14810) eventfd_example: Select timeouted for 4 times
I (14820) eventfd_example: Timer triggerred for 4 times
I (14820) eventfd_example: Progress triggerred for 3 times
I (14830) eventfd_example: =================================
I (4340) eventfd_example: Elapsed since test start: 2003 ms
I (4340) eventfd_example: Select timeout
I (4830) eventfd_example: Elapsed since test start: 2499 ms
I (4830) eventfd_example: TimerEvent fd event triggered
I (5830) eventfd_example: Elapsed since test start: 3493 ms
I (5830) eventfd_example: Progress fd event triggered
I (7330) eventfd_example: Elapsed since test start: 4999 ms
I (7330) eventfd_example: TimerEvent fd event triggered
I (7330) eventfd_example: =================================
I (7340) eventfd_example: Select timeouted for 1 times
I (7340) eventfd_example: Timer triggerred for 2 times
I (7350) eventfd_example: Progress triggerred for 1 times
I (7360) eventfd_example: =================================
I (9330) eventfd_example: Elapsed since test start: 6993 ms
I (9330) eventfd_example: Progress fd event triggered
I (9830) eventfd_example: Elapsed since test start: 7499 ms
I (9830) eventfd_example: TimerEvent fd event triggered
I (11840) eventfd_example: Elapsed since test start: 9503 ms
I (11840) eventfd_example: Select timeout
I (12330) eventfd_example: Elapsed since test start: 9999 ms
I (12330) eventfd_example: TimerEvent fd event triggered
I (12330) eventfd_example: =================================
I (12340) eventfd_example: Select timeouted for 2 times
I (12340) eventfd_example: Timer triggerred for 4 times
I (12350) eventfd_example: Progress triggerred for 2 times
I (12360) eventfd_example: =================================
```
## Diagram
The following diagram shows, with a timeline, the order of the events:
![Timeline](timeline.svg)

21
examples/system/eventfd/example_test.py
View File

@ -15,14 +15,23 @@ def test_examples_eventfd(env, extra_data):
dut.expect('cpu_start: Starting scheduler', timeout=30)
exp_list = [
'eventfd_example: Select timeouted for 4 times',
'eventfd_example: Timer triggerred for 4 times',
'eventfd_example: Progress triggerred for 3 times',
exp_list_5seconds = [
'eventfd_example: Select timeouted for 1 times',
'eventfd_example: Timer triggerred for 2 times',
'eventfd_example: Progress triggerred for 1 times',
]
Utility.console_log('Expecting:{}{}'.format(os.linesep, os.linesep.join(exp_list)))
dut.expect_all(*exp_list, timeout=60)
exp_list_10seconds = [
'eventfd_example: Select timeouted for 2 times',
'eventfd_example: Timer triggerred for 4 times',
'eventfd_example: Progress triggerred for 2 times',
]
Utility.console_log('Expecting:{}{}'.format(os.linesep, os.linesep.join(exp_list_5seconds)))
dut.expect_all(*exp_list_5seconds, timeout=60)
Utility.console_log('Expecting:{}{}'.format(os.linesep, os.linesep.join(exp_list_10seconds)))
dut.expect_all(*exp_list_10seconds, timeout=60)
if __name__ == '__main__':

32
examples/system/eventfd/main/eventfd_example.c
View File

@ -28,11 +28,15 @@
#define PROGRESS_INTERVAL_MS 3500
#define TIMER_SIGNAL 1
#define PROGRESS_SIGNAL 2
/* Print the signals value a bit before 5 seconds, else, `select` would run again
* and the following print may happen 2 seconds (timeout value) later. */
#define PRINT_INTERVAL_MSEC 4990
static const char *TAG = "eventfd_example";
int s_timer_fd;
int s_progress_fd;
static int s_timer_fd;
static int s_progress_fd;
static TaskHandle_t s_worker_handle;
static bool eventfd_timer_isr_callback(void *arg)
{
@ -78,6 +82,9 @@ static void eventfd_timer_init(int timer_idx, double timer_interval_sec)
static void worker_task(void *arg)
{
/* Wait for the collector to be ready. */
ulTaskNotifyTake(true, portMAX_DELAY);
while (true) {
vTaskDelay(pdMS_TO_TICKS(PROGRESS_INTERVAL_MS));
uint64_t signal = PROGRESS_SIGNAL;
@ -102,7 +109,12 @@ static void collector_task(void *arg)
int timer_trigger_count = 0;
int progress_trigger_count = 0;
for (size_t i = 0; ; i++) {
/* Notify the worker we are ready to catch the signals */
assert( xTaskNotifyGive(s_worker_handle) == pdPASS );
uint64_t start = esp_timer_get_time();
uint64_t previous = start;
while (1) {
struct timeval timeout;
uint64_t signal;
@ -117,9 +129,7 @@ static void collector_task(void *arg)
int num_triggered = select(maxFd + 1, &readfds, NULL, NULL, &timeout);
assert(num_triggered >= 0);
uint64_t task_counter_value;
timer_get_counter_value(TIMER_GROUP_0, TIMER_0, &task_counter_value);
ESP_LOGI(TAG, "Time: %.2fs", (double)task_counter_value / TIMER_SCALE);
ESP_LOGI(TAG, "Elapsed since test start: %lld ms", (esp_timer_get_time() - start) / 1000);
if (FD_ISSET(s_progress_fd, &readfds)) {
ssize_t ret = read(s_progress_fd, &signal, sizeof(signal));
@ -140,13 +150,16 @@ static void collector_task(void *arg)
ESP_LOGI(TAG, "Select timeout");
}
if (i % 10 == 0) {
/* Print information about received events every PRINT_INTERVAL_MSEC milliseconds. */
const uint64_t current = esp_timer_get_time();
const uint64_t elapsed = current - previous;
if (elapsed >= PRINT_INTERVAL_MSEC * 1000) {
ESP_LOGI(TAG, "=================================");
ESP_LOGI(TAG, "Select timeouted for %d times", select_timeout_count);
ESP_LOGI(TAG, "Timer triggerred for %d times", timer_trigger_count);
ESP_LOGI(TAG, "Progress triggerred for %d times", progress_trigger_count);
ESP_LOGI(TAG, "=================================");
previous = current;
}
}
@ -160,6 +173,7 @@ static void collector_task(void *arg)
void app_main(void)
{
eventfd_timer_init(TIMER_0, TIMER_INTERVAL_SEC);
xTaskCreate(worker_task, "worker_task", 4 * 1024, NULL, 5, NULL);
/* Save the handle for this task as we will need to notify it */
xTaskCreate(worker_task, "worker_task", 4 * 1024, NULL, 5, &s_worker_handle);
xTaskCreate(collector_task, "collector_task", 4 * 1024, NULL, 5, NULL);
}

657
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