WAIT_EVENT_LOCK_IRQ(9) Driver Basics WAIT_EVENT_LOCK_IRQ(9)NAME
wait_event_lock_irq - sleep until a condition gets true. The condition is checked under the lock. This is expected to be called with the
wait_event_lock_irq(wq, condition, lock);
the waitqueue to wait on
a C expression for the event to wait for
a locked spinlock_t, which will be released before schedule and reacquired afterwards.
The process is put to sleep (TASK_UNINTERRUPTIBLE) until the condition evaluates to true. The condition is checked each time the waitqueue
wq is woken up.
wake_up has to be called after changing any variable that could change the result of the wait condition.
This is supposed to be called while holding the lock. The lock is dropped before going to sleep and is reacquired afterwards.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 WAIT_EVENT_LOCK_IRQ(9)
Check Out this Related Man Page
msem_lock(2) System Calls Manual msem_lock(2)NAME
msem_lock() - lock a semaphore
attempts to lock a binary semaphore.
sem points to an structure which specifies the semaphore to be locked.
If the semaphore is not currently locked, it becomes locked and the function returns successfully.
If the semaphore is currently locked, and condition is then the function returns with an error. If the semaphore is currently locked and
condition is zero, the function does not return until either the calling process is able to successfully lock the semaphore, or an error
All calls to and by multiple processes sharing a common structure behave as if the calls were serialized.
If the structure contains any value not resulting from a call to followed by a (possibly empty) sequence of calls to and the results are
undefined. The address of an uniquely identifies the semaphore. If the structure contains any value copied from an structure at a differ-
ent address, the result is undefined.
If blocked on a locked semaphore, suspends the calling process at a priority such that the process can be interrupted by a signal.
The system attempts to ignore or recover from invalid values written to the structure, but this is not guaranteed for all cases.
successfully acquires a semaphore that is locked by a process that has exited.
returns one of the following values:
is set to indicate the error.
sets to one of the following values if the corresponding condition is encountered.
was specified and the semaphore was already locked.
sem points to an structure that has been removed, or condition is invalid.
was interrupted by a signal that was caught.
The semaphore is currently locked,
condition is zero, and waiting to lock the semaphore would create a deadlock.
sem is not a properly aligned address or is otherwise an invalid pointer.
was developed by HP and OSF.
SEE ALSO msem_init(2), msem_remove(2), msem_unlock(2), mman(5).
STANDARDS CONFORMANCE msem_lock(2)
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