#define rcu_assert(args...)
#endif
+enum rcu_state {
+ RCU_READER_ACTIVE_CURRENT,
+ RCU_READER_ACTIVE_OLD,
+ RCU_READER_INACTIVE,
+};
+
#ifdef DEBUG_YIELD
#include <sched.h>
#include <time.h>
}
}
-static inline int rcu_gp_ongoing(unsigned long *ctr)
+static inline enum rcu_state rcu_reader_state(unsigned long *ctr)
{
unsigned long v;
v = CMM_LOAD_SHARED(*ctr);
- return v && (v != rcu_gp_ctr);
+ if (!v)
+ return RCU_READER_INACTIVE;
+ if (v == rcu_gp_ctr)
+ return RCU_READER_ACTIVE_CURRENT;
+ return RCU_READER_ACTIVE_OLD;
}
/*
{
}
+/*
+ * 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