[PATCH 11/12] closures: closure_wait_event()

Kent Overstreet
2019-06-10T19:15:04Z

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
---
include/linux/closure.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/include/linux/closure.h b/include/linux/closure.h
index 308e38028c..abacb91c35 100644
--- a/include/linux/closure.h
+++ b/include/linux/closure.h
@@ -379,4 +379,26 @@ 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 */
--
2.20.1