Commit ced58fc7 authored by Kent Overstreet's avatar Kent Overstreet Committed by Kent Overstreet
Browse files

closures: closure_wait_event() 



Like wait_event() - except, because it uses closures and closure
waitlists it doesn't have the restriction on modifying task state inside
the condition check, like wait_event() does.

Signed-off-by: default avatarKent Overstreet <kent.overstreet@gmail.com>
Acked-by: default avatarColy Li <colyli@suse.de>
parent bd0d22e4

include/linux/closure.h

+22 −0
Original line number Diff line number Diff line
@@ -374,4 +374,26 @@ static inline void closure_call(struct closure *cl, closure_fn fn, 
	continue_at_nobarrier(cl, fn, wq);

}



#define __closure_wait_event(waitlist, _cond)				\

do {									\

	struct closure cl;						\

									\

	closure_init_stack(&cl);					\

									\

	while (1) {							\

		closure_wait(waitlist, &cl);				\

		if (_cond)						\

			break;						\

		closure_sync(&cl);					\

	}								\

	closure_wake_up(waitlist);					\

	closure_sync(&cl);						\

} while (0)



#define closure_wait_event(waitlist, _cond)				\

do {									\

	if (!(_cond))							\

		__closure_wait_event(waitlist, _cond);			\

} while (0)



#endif /* _LINUX_CLOSURE_H */