diff mbox series

[v7,2/6] rcu: Introduce rcu_read_is_locked()

Message ID 20230310022425.2992472-3-xuchuangxclwt@bytedance.com
State New
Headers show
Series migration: reduce time of loading non-iterable vmstate | expand

Commit Message

Chuang Xu March 10, 2023, 2:24 a.m. UTC 
Add rcu_read_is_locked() to detect holding of rcu lock.

Signed-off-by: Chuang Xu <xuchuangxclwt@bytedance.com>
---
 include/qemu/rcu.h | 7 +++++++
 1 file changed, 7 insertions(+)

Comments

Peter Xu March 10, 2023, 2:50 p.m. UTC | #1 
On Fri, Mar 10, 2023 at 10:24:21AM +0800, Chuang Xu wrote:
> Add rcu_read_is_locked() to detect holding of rcu lock.
> 
> Signed-off-by: Chuang Xu <xuchuangxclwt@bytedance.com>

Reviewed-by: Peter Xu <peterx@redhat.com>
diff mbox series

Patch

diff --git a/include/qemu/rcu.h b/include/qemu/rcu.h
index 313fc414bc..7bf45602e1 100644
--- a/include/qemu/rcu.h
+++ b/include/qemu/rcu.h
@@ -115,6 +115,13 @@  static inline void rcu_read_unlock(void)
     }
 }
 
+static inline bool rcu_read_is_locked(void)
+{
+    struct rcu_reader_data *p_rcu_reader = get_ptr_rcu_reader();
+
+    return p_rcu_reader->depth > 0;
+}
+
 extern void synchronize_rcu(void);
 
 /*