[Qemu-stable] [PATCH 2/5] aio_context: create aio_context_is_locked helper

[Denis V. Lunev]

This helper is necessary to ensure locking constraints.

Signed-off-by: Denis V. Lunev <address@hidden>
CC: Stefan Hajnoczi <address@hidden>
CC: Paolo Bonzini <address@hidden>
---
 async.c             | 5 +++++
 include/block/aio.h | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/async.c b/async.c
index bdc64a3..4a9250e 100644
--- a/async.c
+++ b/async.c
@@ -361,3 +361,8 @@ void aio_context_release(AioContext *ctx)
 {
     rfifolock_unlock(&ctx->lock);
 }
+
+int aio_context_is_locked(AioContext *ctx)
+{
+    return rfifolock_is_locked(&ctx->lock);
+}
diff --git a/include/block/aio.h b/include/block/aio.h
index bcc7d43..d20c7b8 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -166,6 +166,9 @@ void aio_context_acquire(AioContext *ctx);
 /* Relinquish ownership of the AioContext. */
 void aio_context_release(AioContext *ctx);
 
+/* Check that AioContext is locked by the caller. */
+int aio_context_is_locked(AioContext *ctx);
+
 /**
  * aio_bh_new: Allocate a new bottom half structure.
  *
-- 
2.1.4