Commit 3f884a10 authored by Peter Zijlstra's avatar Peter Zijlstra
Browse files

sched/wait: Add wait_event_state() 



Allows waiting with a custom @state.

Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarIngo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20220822114648.989212021@infradead.org
parent 929659ac

include/linux/wait.h

+28 −0
Original line number Diff line number Diff line
@@ -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,				\