> sleep_on_timeout() call in Linux . (dont' want to waste the CPU cycles

You may want to try the manual pages.

% man -k sleep | fgrep '(9)'                                          
endtsleep(9), sleepinit(9), unsleep(9) - manage the queues of sleeping processes
init_sleepqueues(9) ... sleepq_wait_sig(9) - manage the queues of
sleeping threads
sleep(9), msleep(9), tsleep(9), wakeup(9) - wait for events
vm_page_sleep_busy(9)    - wait for a busy page to become unbusy

% man -k DELAY | fgrep '(9)'
DELAY(9)                 - busy loop for an interval

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