Add rcu_read_ongoing() API to each urcu flavor

[urcu.git] / urcu / static / urcu-qsbr.h

diff --git a/urcu/static/urcu-qsbr.h b/urcu/static/urcu-qsbr.h
index f6e55807db267ba66227f1d7046511f56589aa76..ea5e13adebd5fae0374a5ad81693dd6cf46436c2 100644 (file)
--- a/urcu/static/urcu-qsbr.h
+++ b/urcu/static/urcu-qsbr.h
@@ -190,6 +190,18 @@ static inline void _rcu_read_unlock(void)
 {
 }
 
+/*
+ * Returns whether within a RCU read-side critical section.
+ *
+ * This function is less than 10 lines long.  The intent is that this
+ * function meets the 10-line criterion for LGPL, allowing this function
+ * to be invoked directly from non-LGPL code.
+ */
+static inline int _rcu_read_ongoing(void)
+{
+       return URCU_TLS(rcu_reader).ctr;
+}
+
 /*
  * This is a helper function for _rcu_quiescent_state().
  * The first cmm_smp_mb() ensures memory accesses in the prior read-side