[tarantool-patches] [PATCH v4 2/9] core: latch_steal routine

[Georgy Kirichenko <georgy@tarantool.org>]

Allow to steal locked latch ownership for fiber which isn't owner
of the latch. This is required to process transaction triggers
asynchronously.

Prerequisites: #1254
---
 src/lib/core/latch.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/lib/core/latch.h b/src/lib/core/latch.h
index 49c59cf63..580942564 100644
--- a/src/lib/core/latch.h
+++ b/src/lib/core/latch.h
@@ -155,6 +155,16 @@ latch_trylock(struct latch *l)
 	return latch_lock_timeout(l, 0);
 }
 
+/**
+ * Take a latch ownership
+ */
+static inline void
+latch_steal(struct latch *l)
+{
+	assert(l->owner != NULL);
+	l->owner = fiber();
+}
+
 /**
  * \copydoc box_latch_unlock
  */
-- 
2.22.0