RTEMS 4.6.0 On-Line Library

User Extensions Manager TASK_SWITCH Extension

RTEMS Ada User's Guide

21.2.3.5: TASK_SWITCH Extension

The TASK_SWITCH extension corresponds to a task context switch. If this extension is defined in any static or dynamic extension set and a task context switch is in progress, then the extension routine will automatically be invoked by RTEMS. The extension should have a prototype similar to the following:

procedure User_Task_Switch (
   Current_Task : in     RTEMS.TCB_Pointer;
   Heir_Task    : in     RTEMS.TCB_Pointer
);

where current_task can be used to access the TCB for the task that is being swapped out, and heir_task can be used to access the TCB for the task being swapped in. This extension is invoked from RTEMS' dispatcher routine after the current_task context has been saved, but before the heir_task context has been restored. This extension should not call any RTEMS directives.

RTEMS Ada User's Guide