X-Git-Url: http://git.liburcu.org/?p=urcu.git;a=blobdiff_plain;f=urcu-qsbr-static.h;h=22a93b2fd7a823d21c76cbbd1ad5c6bf3b0495e4;hp=3d2ec8f3af5b046c9ca66c3b24e4e77aa762d358;hb=13ba7e6d703b58b0c9d9d872e12930385af087a8;hpb=f0f7dbdd9ba9bff3860d8aea63a3e01b158351de

diff --git a/urcu-qsbr-static.h b/urcu-qsbr-static.h
index 3d2ec8f..22a93b2 100644
--- a/urcu-qsbr-static.h
+++ b/urcu-qsbr-static.h
@@ -161,6 +161,9 @@ static inline void reader_barrier()
 	smp_mb();
 }
 
+#define RCU_GP_ONLINE		(1UL << 0)
+#define RCU_GP_CTR		(1UL << 1)
+
 /*
  * Global quiescent period counter with low-order bits unused.
  * Using a int rather than a char to eliminate false register dependencies
@@ -170,6 +173,17 @@ extern unsigned long urcu_gp_ctr;
 
 extern unsigned long __thread rcu_reader_qs_gp;
 
+#if (BITS_PER_LONG < 64)
+static inline int rcu_gp_ongoing(unsigned long *value)
+{
+	unsigned long reader_gp;
+
+	if (value == NULL)
+		return 0;
+	reader_gp = LOAD_SHARED(*value);
+	return reader_gp && ((reader_gp ^ urcu_gp_ctr) & RCU_GP_CTR);
+}
+#else /* !(BITS_PER_LONG < 64) */
 static inline int rcu_gp_ongoing(unsigned long *value)
 {
 	unsigned long reader_gp;
@@ -179,10 +193,11 @@ static inline int rcu_gp_ongoing(unsigned long *value)
 	reader_gp = LOAD_SHARED(*value);
 	return reader_gp && (reader_gp - urcu_gp_ctr > ULONG_MAX / 2);
 }
+#endif  /* !(BITS_PER_LONG < 64) */
 
 static inline void _rcu_read_lock(void)
 {
-	rcu_assert(rcu_reader_qs_gp & 1);
+	rcu_assert(rcu_reader_qs_gp);
 }
 
 static inline void _rcu_read_unlock(void)