1 files changed, 119 insertions, 0 deletions
diff --git a/src/include/gnunet_load_lib.h b/src/include/gnunet_load_lib.h
new file mode 100644
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--- /dev/null
+++ b/src/include/gnunet_load_lib.h
@@ -0,0 +1,119 @@
+/*
+     This file is part of GNUnet.
+     (C) 2010 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file include/gnunet_load_lib.h
+ * @brief functions related to load calculations
+ * @author Christian Grothoff
+ */
+
+#ifndef GNUNET_LOAD_LIB_H
+#define GNUNET_LOAD_LIB_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#if 0                           /* keep Emacsens' auto-indent happy */
+}
+#endif
+#endif
+
+#include "gnunet_common.h"
+#include "gnunet_time_lib.h"
+
+/**
+ * Opaque load handle.
+ */
+struct GNUNET_LOAD_Value;
+
+/**
+ * Create a new load value.
+ *
+ * @param autodecline speed at which this value should automatically
+ *        decline in the absence of external events; at the given
+ *        frequency, 0-load values will be added to the load
+ * @return the new load value
+ */
+struct GNUNET_LOAD_Value *
+GNUNET_LOAD_value_init (struct GNUNET_TIME_Relative autodecline);
+
+
+/**
+ * Change the value by which the load automatically declines.
+ *
+ * @param load load to update
+ * @param autodecline frequency of load decline
+ */
+void
+GNUNET_LOAD_value_set_decline (struct GNUNET_LOAD_Value *load,
+                               struct GNUNET_TIME_Relative autodecline);
+
+
+/**
+ * Free a load value.
+ *
+ * @param lv value to free
+ */
+#define GNUNET_LOAD_value_free(lv) GNUNET_free (lv)
+
+
+/**
+ * Get the current load.
+ *
+ * @param load load handle
+ * @return zero for below-average load, otherwise
+ *         number of std. devs we are above average;
+ *         100 if the latest updates were so large
+ *         that we could not do proper calculations
+ */
+double
+GNUNET_LOAD_get_load (struct GNUNET_LOAD_Value *load);
+
+
+/**
+ * Get the average value given to update so far.
+ *
+ * @param load load handle
+ * @return zero if update was never called
+ */
+double
+GNUNET_LOAD_get_average (struct GNUNET_LOAD_Value *load);
+
+
+/**
+ * Update the current load.
+ *
+ * @param load to update
+ * @param data latest measurement value (for example, delay)
+ */
+void
+GNUNET_LOAD_update (struct GNUNET_LOAD_Value *load, uint64_t data);
+
+
+#if 0                           /* keep Emacsens' auto-indent happy */
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+/* ifndef GNUNET_LOAD_LIB_H */
+#endif
+/* end of gnunet_load_lib.h */