Changed log manager API so that pointer reference to logmanager is not used anymore. Every call initializes logmanager now except skygw_logmanager_done and skygw_log_flush.

skygw_logmanager_init is still useful because it allows for providing memory address for log manager where it can store a list of preallocated write buffers. TBD.

Logmanager access is now protected with spinlock familiar from epoll/core/spinlock.c . It is modified to avoid trashing; misses are counted and every tenth subsequent lock acquiring attempt triggers short random sleep.

utils/skygw_utils.cc

@@ -134,10 +134,21 @@ static bool file_write_header(skygw_file_t* file);
 static void simple_mutex_free_memory(simple_mutex_t* sm);
 static void mlist_free_memory(mlist_t* ml, char* name);
 static void thread_free_memory(skygw_thread_t* th, char* name);
-
-
 /** End of static function declarations */
 
+int atomic_add(
+        int *variable,
+        int value)
+{
+	asm volatile(
+		"lock; xaddl %%eax, %2;"
+		:"=a" (value)
+		: "a" (value), "m" (*variable)
+		: "memory" );
+	return value;
+}
+
+
 /** mutexed list, mlist */
 
 #if defined(MLIST)