table of contents
| WAIT_EVENT_LOCK_IRQ_(9) | Driver Basics | WAIT_EVENT_LOCK_IRQ_(9) |
NAME¶
wait_event_lock_irq_cmd - sleep until a condition gets true. The condition is checked under the lock. This is expected to be called with the lock taken.
SYNOPSIS¶
wait_event_lock_irq_cmd(wq, condition, lock, cmd);
ARGUMENTS¶
wq
the waitqueue to wait on
condition
a C expression for the event to wait for
lock
a locked spinlock_t, which will be released before cmd
and schedule and reacquired afterwards.
cmd
a command which is invoked outside the critical section
before sleep
DESCRIPTION¶
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 invoking the cmd and going to sleep and is reacquired afterwards.
COPYRIGHT¶
| June 2024 | Kernel Hackers Manual 3.10 |