linux-kernel - [PATCH 09/10] closures: closure_wait

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Message-Id: <20180518074918.13816-19-kent.overstreet@gmail.com>
Date:   Fri, 18 May 2018 03:49:16 -0400
From:   Kent Overstreet <kent.overstreet@...il.com>
To:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Chinner <dchinner@...hat.com>, darrick.wong@...cle.com,
        tytso@....edu, linux-btrfs@...r.kernel.org, clm@...com,
        jbacik@...com, viro@...iv.linux.org.uk, willy@...radead.org,
        peterz@...radead.org
Subject: [PATCH 09/10] closures: closure_wait_event()

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

diff --git a/include/linux/closure.h b/include/linux/closure.h
index 1072bf2c13..ef22d18f7c 100644
--- a/include/linux/closure.h
+++ b/include/linux/closure.h
@@ -375,4 +375,26 @@ 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 */
-- 
2.17.0