urcu-defer: generate linker error if call_rcu() is used

[urcu.git] / urcu-defer.h

diff --git a/urcu-defer.h b/urcu-defer.h
index 456b8b7ff9bcbc635731cca576a609dc6de8c289..00f18ff47af3177c205006139fbc00850d12b446 100644 (file)
--- a/urcu-defer.h
+++ b/urcu-defer.h
@@ -33,33 +33,28 @@
 #include <pthread.h>
 
 /*
+ * Note: the defer_rcu() API is currently EXPERIMENTAL. It may change in the
+ * future.
+ * 
  * Important !
  *
  * Each thread queuing memory reclamation must be registered with
  * rcu_defer_register_thread(). rcu_defer_unregister_thread() should be
  * called before the thread exits.
+ *
+ * *NEVER* use defer_rcu() within a RCU read-side critical section, because this
+ * primitive need to call synchronize_rcu() if the thread queue is full.
  */
 
-#ifdef _LGPL_SOURCE
-
-#include <urcu-defer-static.h>
-
-/*
- * Mappings for static use of the userspace RCU library.
- * Should only be used in LGPL-compatible code.
- */
-
-#define rcu_defer_queue        _rcu_defer_queue
-
-#else /* !_LGPL_SOURCE */
+extern void defer_rcu(void (*fct)(void *p), void *p);
 
 /*
- * library wrappers to be used by non-LGPL compatible source code.
+ * call_rcu will eventually be implemented with an API similar to the Linux
+ * kernel call_rcu(), which will allow its use within RCU read-side C.S.
+ * Generate an error if used for now.
  */
 
-extern void rcu_defer_queue(void *p);
-
-#endif /* !_LGPL_SOURCE */
+#define call_rcu       __error_call_rcu_not_implemented_please_use_defer_rcu
 
 /*
  * Thread registration for reclamation.