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OS Data view

Use the OS Data view to display OS awareness information for RTOSs. You can view details about tasks, semaphores, mutexes, and mailboxes.

See About OS awareness for information about OS awareness support in Arm® Development Studio.


The OS Data view is not used when debugging Linux applications. To view the running threads information for Linux applications, use the Debug Control view.

To view information, select a table from the list.

Figure 15-36 OS Data view (showing Keil CMSIS-RTOS RTX Tasks)

OS Data view (showing Keil CMSIS-RTOS RTX Tasks)


Data in the OS Data view depends on the selected data source.

Toolbar and context menu options

Linked: context

Links this view to the selected connection in the Debug Control view. This is the default. Alternatively you can link the view to a different connection. If the connection you want is not shown in the list, you might have to select it first in the Debug Control view.

Show linked data in other Data views

Shows selected data in a view that is linked to another view.

View Menu

This menu contains the following option:

New OS Data View

Displays a new instance of the OS Data view.

Update View When Hidden

Enables the updating of the view when it is hidden behind other views. By default, this view does not update when hidden.


Refreshes the view.

Freeze Data

Toggles the freezing of data in the current view. This option prevents automatic updating of the view. You can still use the Refresh option to manually refresh the view.


If the data is frozen, the value of a variable cannot be changed.
Editing context menu options

The following options are available on the context menu when you select a variable value for editing:


Copies the selected value.

Select All

Selects all text.