Example: Fix eventfd example test and added a diagram to explain printed values

examples/system/eventfd/README.md

@@ -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 (4340) eventfd_example: Elapsed since test start: 2003 ms
-I (4310) eventfd_example: Select timeout
+I (4340) eventfd_example: Select timeout
-I (4310) eventfd_example: =================================
+I (4830) eventfd_example: Elapsed since test start: 2499 ms
-I (4310) eventfd_example: Select timeouted for 1 times
+I (4830) eventfd_example: TimerEvent fd event triggered
-I (4320) eventfd_example: Timer triggerred for 0 times
+I (5830) eventfd_example: Elapsed since test start: 3493 ms
-I (4320) eventfd_example: Progress triggerred for 0 times
+I (5830) eventfd_example: Progress fd event triggered
-I (4330) eventfd_example: =================================
+I (7330) eventfd_example: Elapsed since test start: 4999 ms
-I (4810) eventfd_example: Time: 2.50s
+I (7330) eventfd_example: TimerEvent fd event triggered
-I (4810) eventfd_example: TimerEvent fd event triggered
+I (7330) eventfd_example: =================================
-I (5810) eventfd_example: Time: 3.49s
+I (7340) eventfd_example: Select timeouted for 1 times
-I (5810) eventfd_example: Progress fd event triggered
+I (7340) eventfd_example: Timer triggerred for 2 times
-I (7310) eventfd_example: Time: 5.00s
+I (7350) eventfd_example: Progress triggerred for 1 times
-I (7310) eventfd_example: TimerEvent fd event triggered
+I (7360) eventfd_example: =================================
-I (9310) eventfd_example: Time: 6.99s
+I (9330) eventfd_example: Elapsed since test start: 6993 ms
-I (9310) eventfd_example: Select timeout
+I (9330) eventfd_example: Progress fd event triggered
-I (9310) eventfd_example: Time: 6.99s
+I (9830) eventfd_example: Elapsed since test start: 7499 ms
-I (9310) eventfd_example: Progress fd event triggered
+I (9830) eventfd_example: TimerEvent fd event triggered
-I (9810) eventfd_example: Time: 7.50s
+I (11840) eventfd_example: Elapsed since test start: 9503 ms
-I (9810) eventfd_example: TimerEvent fd event triggered
+I (11840) eventfd_example: Select timeout
-I (11810) eventfd_example: Time: 9.49s
+I (12330) eventfd_example: Elapsed since test start: 9999 ms
-I (11810) eventfd_example: Select timeout
+I (12330) eventfd_example: TimerEvent fd event triggered
-I (12310) eventfd_example: Time: 10.00s
+I (12330) eventfd_example: =================================
-I (12310) eventfd_example: TimerEvent fd event triggered
+I (12340) eventfd_example: Select timeouted for 2 times
-I (12810) eventfd_example: Time: 10.49s
+I (12340) eventfd_example: Timer triggerred for 4 times
-I (12810) eventfd_example: Progress fd event triggered
+I (12350) eventfd_example: Progress triggerred for 2 times
-I (14810) eventfd_example: Time: 12.49s
+I (12360) eventfd_example: =================================
-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: =================================
 ```
+
+## Diagram
+
+The following diagram shows, with a timeline, the order of the events:
+
+![Timeline](timeline.svg)

examples/system/eventfd/example_test.py

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

examples/system/eventfd/main/eventfd_example.c

@@ -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;
+static int s_timer_fd;
-int s_progress_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;
+        ESP_LOGI(TAG, "Elapsed since test start: %lld ms", (esp_timer_get_time() - start) / 1000);
-        timer_get_counter_value(TIMER_GROUP_0, TIMER_0, &task_counter_value);
-        ESP_LOGI(TAG, "Time: %.2fs", (double)task_counter_value / TIMER_SCALE);
 
         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);
 }

examples/system/eventfd/timeline.svg

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+           width="100%"
+           height="100%"
+           requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"
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+           pointer-events="none"
+           width="100%"
+           height="100%"
+           requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"
+           style="overflow: visible; text-align: left;">
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+        <foreignObject
+           pointer-events="none"
+           width="100%"
+           height="100%"
+           requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"
+           style="overflow: visible; text-align: left;">
+          <xhtml:div
+             style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 38px; height: 1px; padding-top: 55px; margin-left: 411px;">
+            <xhtml:div
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+              <xhtml:div
+                 style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">10s</xhtml:div>
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+           y="59"
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+    <path
+       d="M 2150 575 L 2150 375"
+       fill="none"
+       stroke="#000000"
+       stroke-width="5"
+       stroke-miterlimit="10"
+       pointer-events="stroke"
+       id="path102" />
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+       y="225"
+       width="200"
+       height="100"
+       fill="none"
+       stroke="none"
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+    <g
+       transform="translate(-0.5 -0.5)scale(5)"
+       id="g110">
+      <switch
+         id="switch108">
+        <foreignObject
+           pointer-events="none"
+           width="100%"
+           height="100%"
+           requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"
+           style="overflow: visible; text-align: left;">
+          <xhtml:div
+             style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 38px; height: 1px; padding-top: 55px; margin-left: 611px;">
+            <xhtml:div
+               style="box-sizing: border-box; font-size: 0px; text-align: center;">
+              <xhtml:div
+                 style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">15s</xhtml:div>
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+        <text
+           x="630"
+           y="59"
+           fill="#000000"
+           font-family="Helvetica"
+           font-size="12px"
+           text-anchor="middle"
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+      </switch>
+    </g>
+    <path
+       d="M 3150 575 L 3150 375"
+       fill="none"
+       stroke="#000000"
+       stroke-width="5"
+       stroke-miterlimit="10"
+       pointer-events="stroke"
+       id="path112" />
+    <rect
+       x="4050"
+       y="225"
+       width="200"
+       height="100"
+       fill="none"
+       stroke="none"
+       pointer-events="all"
+       id="rect114" />
+    <g
+       transform="translate(-0.5 -0.5)scale(5)"
+       id="g120">
+      <switch
+         id="switch118">
+        <foreignObject
+           pointer-events="none"
+           width="100%"
+           height="100%"
+           requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"
+           style="overflow: visible; text-align: left;">
+          <xhtml:div
+             style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 38px; height: 1px; padding-top: 55px; margin-left: 811px;">
+            <xhtml:div
+               style="box-sizing: border-box; font-size: 0px; text-align: center;">
+              <xhtml:div
+                 style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">20s</xhtml:div>
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+        <text
+           x="830"
+           y="59"
+           fill="#000000"
+           font-family="Helvetica"
+           font-size="12px"
+           text-anchor="middle"
+           id="text116">20s</text>
+      </switch>
+    </g>
+    <path
+       d="M 4150 575 L 4150 375"
+       fill="none"
+       stroke="#000000"
+       stroke-width="5"
+       stroke-miterlimit="10"
+       pointer-events="stroke"
+       id="path122" />
+    <path
+       d="M 150 925 L 150 825"
+       fill="none"
+       stroke="#b85450"
+       stroke-opacity="0.5"
+       stroke-width="20"
+       stroke-miterlimit="10"
+       pointer-events="stroke"
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+       y="825"
+       width="1650"
+       height="100"
+       fill="none"
+       stroke="none"
+       pointer-events="all"
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+    <g
+       transform="translate(-0.5 -0.5)scale(5)"
+       id="g132">
+      <switch
+         id="switch130">
+        <foreignObject
+           pointer-events="none"
+           width="100%"
+           height="100%"
+           requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"
+           style="overflow: visible; text-align: left;">
+          <xhtml:div
+             style="display: flex; align-items: unsafe center; justify-content: unsafe flex-start; width: 328px; height: 1px; padding-top: 175px; margin-left: 42px;">
+            <xhtml:div
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+              <xhtml:div
+                 style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Timeout not reached because it is rounded up to system tick</xhtml:div>
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+        <text
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+           y="179"
+           fill="#000000"
+           font-family="Helvetica"
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+         y="100%"
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