2021-03-08 07:48:30 +00:00
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# eventfd example
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The example demonstrates the use of `eventfd()` to collect events from other tasks and ISRs in a
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`select()` based main loop. The example starts two tasks and installs a timer interrupt handler:
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1. The first task writes to the first `eventfd` periodically.
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2. The timer interrupt handler writes to the second `eventfd`.
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3. The second task collects the event from two fds with a `select()` loop.
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2021-03-08 11:52:05 +00:00
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## How to use example
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### Hardware Required
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This example should be able to run on any commonly available ESP32, ESP32S2, ESP32S3 or ESP32C3 development board.
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### Configure the project
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```
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idf.py menuconfig
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```
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The default config will work.
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### Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(Replace PORT with the name of the serial port to use.)
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Example Output
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The following log output should appear when the example runs (note that the bootloader log has been omitted).
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```
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I (4310) eventfd_example: Time: 1.99s
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I (4310) eventfd_example: Select timeout
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I (4310) eventfd_example: =================================
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I (4310) eventfd_example: Select timeouted for 1 times
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I (4320) eventfd_example: Timer triggerred for 0 times
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I (4320) eventfd_example: Progress triggerred for 0 times
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I (4330) eventfd_example: =================================
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I (4810) eventfd_example: Time: 2.50s
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I (4810) eventfd_example: TimerEvent fd event triggered
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I (5810) eventfd_example: Time: 3.49s
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I (5810) eventfd_example: Progress fd event triggered
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I (7310) eventfd_example: Time: 5.00s
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I (7310) eventfd_example: TimerEvent fd event triggered
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I (9310) eventfd_example: Time: 6.99s
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I (9310) eventfd_example: Select timeout
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I (9310) eventfd_example: Time: 6.99s
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I (9310) eventfd_example: Progress fd event triggered
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I (9810) eventfd_example: Time: 7.50s
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I (9810) eventfd_example: TimerEvent fd event triggered
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I (11810) eventfd_example: Time: 9.49s
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I (11810) eventfd_example: Select timeout
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I (12310) eventfd_example: Time: 10.00s
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I (12310) eventfd_example: TimerEvent fd event triggered
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I (12810) eventfd_example: Time: 10.49s
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I (12810) eventfd_example: Progress fd event triggered
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I (14810) eventfd_example: Time: 12.49s
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I (14810) eventfd_example: Select timeout
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I (14810) eventfd_example: =================================
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I (14810) eventfd_example: Select timeouted for 4 times
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I (14820) eventfd_example: Timer triggerred for 4 times
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I (14820) eventfd_example: Progress triggerred for 3 times
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I (14830) eventfd_example: =================================
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```
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