getblocktemplate: longpolling support

src/sync.h

@@ -84,6 +84,9 @@ typedef AnnotatedMixin<boost::recursive_mutex> CCriticalSection;
 /** Wrapped boost mutex: supports waiting but not recursive locking */
 typedef AnnotatedMixin<boost::mutex> CWaitableCriticalSection;
 
+/** Just a typedef for boost::condition_variable, can be wrapped later if desired */
+typedef boost::condition_variable CConditionVariable;
+
 #ifdef DEBUG_LOCKORDER
 void EnterCritical(const char* pszName, const char* pszFile, int nLine, void* cs, bool fTry = false);
 void LeaveCritical();