1.. zephyr:code-sample:: zbus-work-queue
2 :name: Work queue
3 :relevant-api: zbus_apis
4
5 Use a work queue to process zbus messages in various ways.
6
7Overview
8********
9This sample implements an application using zbus to illustrate three different reaction options. First, the observer can react "instantaneously" by using a listener callback. It can schedule a job, pushing that to the system work queue. Last, it can wait and execute that in a subscriber thread.
10
11Building and Running
12********************
13
14This project outputs to the console. It can be built and executed
15on QEMU as follows:
16
17.. zephyr-app-commands::
18 :zephyr-app: samples/subsys/zbus/work_queue
19 :host-os: unix
20 :board: qemu_x86
21 :goals: run
22
23Sample Output
24=============
25
26.. code-block:: console
27
28 I: Sensor msg processed by CALLBACK fh1: temp = 10, press = 1, humidity = 100
29 I: Sensor msg processed by CALLBACK fh2: temp = 10, press = 1, humidity = 100
30 I: Sensor msg processed by CALLBACK fh3: temp = 10, press = 1, humidity = 100
31 I: Sensor msg processed by WORK QUEUE handler dh1: temp = 10, press = 1, humidity = 100
32 I: Sensor msg processed by WORK QUEUE handler dh2: temp = 10, press = 1, humidity = 100
33 I: Sensor msg processed by WORK QUEUE handler dh3: temp = 10, press = 1, humidity = 100
34 I: Sensor msg processed by THREAD handler 1: temp = 10, press = 1, humidity = 100
35 I: Sensor msg processed by THREAD handler 2: temp = 10, press = 1, humidity = 100
36 I: Sensor msg processed by THREAD handler 3: temp = 10, press = 1, humidity = 100
37 I: Sensor msg processed by CALLBACK fh1: temp = 20, press = 2, humidity = 200
38 I: Sensor msg processed by CALLBACK fh2: temp = 20, press = 2, humidity = 200
39 I: Sensor msg processed by CALLBACK fh3: temp = 20, press = 2, humidity = 200
40 I: Sensor msg processed by WORK QUEUE handler dh1: temp = 20, press = 2, humidity = 200
41 I: Sensor msg processed by WORK QUEUE handler dh2: temp = 20, press = 2, humidity = 200
42 I: Sensor msg processed by WORK QUEUE handler dh3: temp = 20, press = 2, humidity = 200
43 I: Sensor msg processed by THREAD handler 1: temp = 20, press = 2, humidity = 200
44 I: Sensor msg processed by THREAD handler 2: temp = 20, press = 2, humidity = 200
45 I: Sensor msg processed by THREAD handler 3: temp = 20, press = 2, humidity = 200
46 I: Sensor msg processed by CALLBACK fh1: temp = 30, press = 3, humidity = 300
47 I: Sensor msg processed by CALLBACK fh2: temp = 30, press = 3, humidity = 300
48 I: Sensor msg processed by CALLBACK fh3: temp = 30, press = 3, humidity = 300
49 I: Sensor msg processed by WORK QUEUE handler dh1: temp = 30, press = 3, humidity = 300
50 I: Sensor msg processed by WORK QUEUE handler dh2: temp = 30, press = 3, humidity = 300
51 I: Sensor msg processed by WORK QUEUE handler dh3: temp = 30, press = 3, humidity = 300
52 I: Sensor msg processed by THREAD handler 1: temp = 30, press = 3, humidity = 300
53 I: Sensor msg processed by THREAD handler 2: temp = 30, press = 3, humidity = 300
54 I: Sensor msg processed by THREAD handler 3: temp = 30, press = 3, humidity = 300
55 <continues>
56
57Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.
58
