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sched/wait: Add wait_event_state()

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Allows waiting with a custom @state.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20220822114648.989212021@infradead.org
This commit is contained in:
Peter Zijlstra 2022-08-22 13:18:21 +02:00
parent 929659acea
commit 3f884a10ab
1 changed files with 28 additions and 0 deletions
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28
include/linux/wait.h
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@ -932,6 +932,34 @@ extern int do_wait_intr_irq(wait_queue_head_t *, wait_queue_entry_t *);
__ret; \
})
#define __wait_event_state(wq, condition, state) \
___wait_event(wq, condition, state, 0, 0, schedule())
/**
* wait_event_state - sleep until a condition gets true
* @wq_head: the waitqueue to wait on
* @condition: a C expression for the event to wait for
* @state: state to sleep in
*
* The process is put to sleep (@state) until the @condition evaluates to true
* or a signal is received (when allowed by @state). The @condition is checked
* each time the waitqueue @wq_head is woken up.
*
* wake_up() 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
* (when allowed by @state) and 0 if @condition evaluated to true.
*/
#define wait_event_state(wq_head, condition, state) \
({ \
int __ret = 0; \
might_sleep(); \
if (!(condition)) \
__ret = __wait_event_state(wq_head, condition, state); \
__ret; \
})
#define __wait_event_killable_timeout(wq_head, condition, timeout) \
___wait_event(wq_head, ___wait_cond_timeout(condition), \
TASK_KILLABLE, 0, timeout, \