RTEMS C User's Guide
The TASK_BEGIN extension is invoked when a task begins execution. It is invoked immediately before the body of the starting procedure and executes in the context in the task. This user extension have a prototype similar to the following:
rtems_extension user_task_begin( rtems_tcb *current_task );
where current_task can be used to access the TCB for the currently executing task which has begun. The distinction between the TASK_BEGIN and TASK_START extension is that the TASK_BEGIN extension is executed in the context of the actual task while the TASK_START extension is executed in the context of the task performing the task_start directive. For most extensions, this is not a critical distinction.
RTEMS C User's Guide
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