.. zephyr:code-sample:: zbus-work-queue :name: Work queue :relevant-api: zbus_apis Use a work queue to process zbus messages in various ways. Overview ******** This 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. Building and Running ******************** This project outputs to the console. It can be built and executed on QEMU as follows: .. zephyr-app-commands:: :zephyr-app: samples/subsys/zbus/work_queue :host-os: unix :board: qemu_x86 :goals: run Sample Output ============= .. code-block:: console I: Sensor msg processed by CALLBACK fh1: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by CALLBACK fh2: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by CALLBACK fh3: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by WORK QUEUE handler dh1: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by WORK QUEUE handler dh2: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by WORK QUEUE handler dh3: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by THREAD handler 1: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by THREAD handler 2: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by THREAD handler 3: temp = 10, press = 1, humidity = 100 I: Sensor msg processed by CALLBACK fh1: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by CALLBACK fh2: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by CALLBACK fh3: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by WORK QUEUE handler dh1: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by WORK QUEUE handler dh2: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by WORK QUEUE handler dh3: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by THREAD handler 1: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by THREAD handler 2: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by THREAD handler 3: temp = 20, press = 2, humidity = 200 I: Sensor msg processed by CALLBACK fh1: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by CALLBACK fh2: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by CALLBACK fh3: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by WORK QUEUE handler dh1: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by WORK QUEUE handler dh2: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by WORK QUEUE handler dh3: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by THREAD handler 1: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by THREAD handler 2: temp = 30, press = 3, humidity = 300 I: Sensor msg processed by THREAD handler 3: temp = 30, press = 3, humidity = 300 Exit QEMU by pressing :kbd:`CTRL+A` :kbd:`x`.