MIGHT_SLEEP(9) Driver Basics MIGHT_SLEEP(9)NAME
might_sleep - annotation for functions that can sleep
this macro will print a stack trace if it is executed in an atomic context (spinlock, irq-handler, ...).
This is a useful debugging help to be able to catch problems early and not be bitten later when the calling function happens to sleep when
it is not supposed to.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 MIGHT_SLEEP(9)
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WAIT_EVENT_INTERRUPT(9) Driver Basics WAIT_EVENT_INTERRUPT(9)NAME
wait_event_interruptible_exclusive_locked_irq - sleep until a condition gets true
the waitqueue to wait on
a C expression for the event to wait for
The process is put to sleep (TASK_INTERRUPTIBLE) until the condition evaluates to true or a signal is received. The condition is checked
each time the waitqueue wq is woken up.
It must be called with wq.lock being held. This spinlock is unlocked while sleeping but condition testing is done while lock is held and
when this macro exits the lock is held.
The lock is locked/unlocked using spin_lock_irq/spin_unlock_irq functions which must match the way they are locked/unlocked outside of this
The process is put on the wait queue with an WQ_FLAG_EXCLUSIVE flag set thus when other process waits process on the list if this process
is awaken further processes are not considered.
wake_up_locked has to be called after changing any variable that could change the result of the wait condition.
The function will return -ERESTARTSYS if it was interrupted by a signal and 0 if condition evaluated to true.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 WAIT_EVENT_INTERRUPT(9)
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