From 240abf6c46779e0cf4d718d14d96fe8bf5b68470 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Fri, 19 Oct 2018 11:47:48 +1030
Subject: [PATCH] common/io_lock: add helper to query if lock is taken.

Not just for debugging; we actually need to know if a write is active for
the coming hack.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
 common/io_lock.c | 5 +++++
 common/io_lock.h | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/common/io_lock.c b/common/io_lock.c
index 5c35edba7..d32a510d0 100644
--- a/common/io_lock.c
+++ b/common/io_lock.c
@@ -80,3 +80,8 @@ void io_lock_release(struct io_lock *lock)
 	lock->locked = false;
 	io_wake(lock);
 }
+
+bool io_lock_taken(const struct io_lock *lock)
+{
+	return lock->locked;
+}
diff --git a/common/io_lock.h b/common/io_lock.h
index 47b84ccd3..a1130d854 100644
--- a/common/io_lock.h
+++ b/common/io_lock.h
@@ -47,4 +47,9 @@ struct io_plan *io_lock_acquire_in_(struct io_conn *conn, struct io_lock *lock,
  */
 void io_lock_release(struct io_lock *lock);
 
+/**
+ * Is this lock acquired?
+ */
+bool io_lock_taken(const struct io_lock *lock);
+
 #endif /* LIGHTNING_COMMON_IO_LOCK_H */