diff mbox series

[RESEND,v6,2/5] rcu: Introduce rcu_read_is_locked()

Message ID 20230303105655.396446-3-xuchuangxclwt@bytedance.com (mailing list archive)
State New, archived
Headers show
Series migration: reduce time of loading non-iterable vmstate | expand

Commit Message

Chuang Xu March 3, 2023, 10:56 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(+)
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Patch

diff --git a/include/qemu/rcu.h b/include/qemu/rcu.h
index b063c6fde8..719916d9d3 100644
--- a/include/qemu/rcu.h
+++ b/include/qemu/rcu.h
@@ -119,6 +119,13 @@  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);
 
 /*