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RTX and tsk_lock()

one simple question
when i disable the scheduler with tsk_lock() just before the systick IRQ will be executed will this IRQ lost ?
for example, every 1ms the scheduler will be called then at time 3.9ms i disable the scheduler, run the code and at time 4.1ms i enable the scheduler again with tsk_unlock().
when will the scheduler called again ?
immediatly after enable the scheduler (4.1ms) or at time 5ms ?
Thanks,
mario

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