update x86 and ppc atomic ops

[urcu.git] / urcu-static.h

diff --git a/urcu-static.h b/urcu-static.h
index 1b3527fd2de649b087a502ec42af2098ba095ec3..0c6891e77ca0871f85cd1461333c0facd95bcf13 100644 (file)
--- a/urcu-static.h
+++ b/urcu-static.h
@@ -76,6 +76,15 @@
  * Inserts memory barriers on architectures that require them (currently only
  * Alpha) and documents which pointers are protected by RCU.
  *
+ * The compiler memory barrier in LOAD_SHARED() ensures that value-speculative
+ * optimizations (e.g. VSS: Value Speculation Scheduling) does not perform the
+ * data read before the pointer read by speculating the value of the pointer.
+ * Correct ordering is ensured because the pointer is read as a volatile access.
+ * This acts as a global side-effect operation, which forbids reordering of
+ * dependent memory operations. Note that such concern about dependency-breaking
+ * optimizations will eventually be taken care of by the "memory_order_consume"
+ * addition to forthcoming C++ standard.
+ *
  * Should match rcu_assign_pointer() or rcu_xchg_pointer().
  */
 
@@ -108,6 +117,12 @@
  */
 #define KICK_READER_LOOPS 10000
 
+#ifdef DEBUG_RCU
+#define rcu_assert(args...)    assert(args)
+#else
+#define rcu_assert(args...)
+#endif
+
 #ifdef DEBUG_YIELD
 #include <sched.h>
 #include <time.h>
@@ -117,8 +132,11 @@
 #define YIELD_READ     (1 << 0)
 #define YIELD_WRITE    (1 << 1)
 
-/* Updates without DEBUG_FULL_MB are much slower. Account this in the delay */
-#ifdef DEBUG_FULL_MB
+/*
+ * Updates without URCU_MB are much slower. Account this in
+ * the delay.
+ */
+#ifdef URCU_MB
 /* maximum sleep delay, in us */
 #define MAX_SLEEP 50
 #else
@@ -161,7 +179,7 @@ static inline void debug_yield_init(void)
 }
 #endif
 
-#ifdef DEBUG_FULL_MB
+#ifdef URCU_MB
 static inline void reader_barrier()
 {
        smp_mb();