Is it necessary to disable thread dispatching while functions of timer message are called ?

[Tom]

Hi all,
 
Is it necessary to disable thread dispatching while functions of timer message semaphore are called ?
 
For example ,  when  the function `rtems_message_queue_send' is called,  thread dispatching will be disabled due to
the _Object_Get call.
 
So unless  `rtems_message_queue_send'  is finished,  other threads with higher priorities will not be allowed to run.
 
Is this necessary ?  And why ?
 
Regards
 
Tom
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