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wait_event_interruptible_exclusive_locked_irq(9) [centos man page]

WAIT_EVENT_INTERRUPT(9) 					   Driver Basics					   WAIT_EVENT_INTERRUPT(9)

NAME
wait_event_interruptible_exclusive_locked_irq - sleep until a condition gets true SYNOPSIS
wait_event_interruptible_exclusive_locked_irq(wq, condition); ARGUMENTS
wq the waitqueue to wait on condition a C expression for the event to wait for DESCRIPTION
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 macro. 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)

Check Out this Related Man Page

msem_unlock(3)						     Library Functions Manual						    msem_unlock(3)

NAME
msem_unlock - Unlocks a semaphore LIBRARY
Standard C Library (libc.a) SYNOPSIS
#include <sys/mman.h> int msem_unlock ( msemaphore *sem, int condition ); PARAMETERS
Points to an msemaphore structure which specifies the semaphore to be unlocked. Determines whether the msem_unlock() function unlocks the semaphore if no other processes are waiting to lock it. DESCRIPTION
The msem_unlock() function unlocks a binary semaphore. If the condition parameter is 0 (zero), the semaphore is unlocked, whether or not any other processes are currently attempting to lock it. If the condition parameter is MSEM_IF_WAITERS, and another process is waiting to lock the semaphore or it cannot be reliably determined whether some process is waiting to lock the semaphore, the semaphore is unlocked by the calling process. If the condition parameter is MSEM_IF_WAITERS, and no process is waiting to lock the semaphore, the semaphore will not be unlocked and an error will be returned. All calls to the msem_lock() and msem_unlock() functions by multiple processes sharing a common msemaphore structure behave as if the calls were serialized. If the msemaphore structure contains any value not resulting from a call to the msem_init() function followed by a (possibly empty) sequence of calls to the msem_lock() and msem_unlock() functions, the results are undefined. The address of an msemaphore structure may be significant. If the msemaphore structure contains any value copied from an msemaphore structure at a different address, the result is undefined. NOTES
Trial use RETURN VALUES
On successful completion, the msem_unlock() function returns 0 (zero). On error, the msem_unlock() function returns -1 and sets errno to indicate the error. ERRORS
If the msem_unlock() function fails, errno may be set to one of the following values: MSEM_IF_WAITERS was specified and there were no wait- ers. The sem parameter points to an msemaphore structure which specifies a semaphore which has been removed, or the condition parameter is invalid. RELATED INFORMATION
Functions: msem_init(3), msem_lock(3), msem_remove(3) delim off msem_unlock(3)
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