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a question about _Thread_Dispatch_disable

Hi all,
 I am studying RTEMS supercore code. A question comes up.
 If variables that shared among threads should be protected by _Thread_Disale_dispatch()/_Thread_Enable_dispatch()?
 but when executing those two functions, there is no instructions to disable interrupt, what if an interrupt occures in those functions and modifies the _Thread_Dispatch_disable_level ?
 When to use _ISR_Disable and when to use _Thread_Dispatch_disable ?   
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