Changeset d4d36f9 in mainline for kernel/generic/include/synch/rcu.h

Timestamp:

2012-07-30T05:23:06Z (12 years ago)

Author:

Adam Hraska <adam.hraska+hos@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

452e91b

Parents:

f0fcb04

Message:

rcu: Added another preemptible kernel rcu - A-RCU.

File:

• kernel/generic/include/synch/rcu.h (modified) (2 diffs)

kernel/generic/include/synch/rcu.h

@@ -123 +123 @@
 extern void _rcu_synchronize(bool expedite);
 
+
+#ifdef RCU_PREEMPT_A
+
+#define RCU_CNT_INC       (1 << 1)
+#define RCU_WAS_PREEMPTED (1 << 0)
+
+/* Fwd. decl. because of inlining. */
+void _rcu_preempted_unlock(void);
+
+/** Delimits the start of an RCU reader critical section. 
+ * 
+ * Reader sections may be nested and are preemptable. You must not
+ * however block/sleep within reader sections.
+ */
+static inline void rcu_read_lock(void)
+{
+        THE->rcu_nesting += RCU_CNT_INC;
+}
+
+/** Delimits the end of an RCU reader critical section. */
+static inline void rcu_read_unlock(void)
+{
+        THE->rcu_nesting -= RCU_CNT_INC;
+        
+        if (RCU_WAS_PREEMPTED == THE->rcu_nesting) {
+                _rcu_preempted_unlock();
+        }
+}
+
+#elif defined(RCU_PREEMPT_PODZIMEK)
 
 /* Fwd decl. required by the inlined implementation. Not part of public API. */
@@ -210 +240 @@
         preemption_enable();
 }
-
-
 #endif
 
+#endif
+
 /** @}
  */