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sk_wait_data(9) [centos man page]

SK_WAIT_DATA(9) 						 Linux Networking						   SK_WAIT_DATA(9)

sk_wait_data - wait for data to arrive at sk_receive_queue SYNOPSIS
int sk_wait_data(struct sock * sk, long * timeo); ARGUMENTS
sk sock to wait on timeo for how long DESCRIPTION
Now socket state including sk->sk_err is changed only under lock, hence we may omit checks after joining wait queue. We check receive queue before schedule only as optimization; it is very likely that release_sock added new data. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SK_WAIT_DATA(9)

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WAIT_EVENT_INTERRUPT(9) 					   Driver Basics					   WAIT_EVENT_INTERRUPT(9)

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)
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