1 files changed, 45 insertions, 0 deletions
diff --git a/include/haproxy/freq_ctr-t.h b/include/haproxy/freq_ctr-t.h
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+++ b/include/haproxy/freq_ctr-t.h
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+/*
+ * include/haproxy/freq_ctr.h
+ * This file contains structure declarations for frequency counters.
+ *
+ * Copyright (C) 2000-2020 Willy Tarreau - w@1wt.eu
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef _HAPROXY_FREQ_CTR_T_H
+#define _HAPROXY_FREQ_CTR_T_H
+
+#include <haproxy/api-t.h>
+
+/* The generic freq_ctr counter counts a rate of events per period, where the
+ * period has to be known by the user. The period is measured in ticks and
+ * must be at least 2 ticks long. This form is slightly more CPU intensive for
+ * reads than the per-second form as it involves a divide.
+ */
+struct freq_ctr {
+	unsigned int curr_tick; /* start date of current period (wrapping ticks) */
+	unsigned int curr_ctr; /* cumulated value for current period */
+	unsigned int prev_ctr; /* value for last period */
+};
+
+#endif /* _HAPROXY_FREQ_CTR_T_H */
+
+/*
+ * Local variables:
+ *  c-indent-level: 8
+ *  c-basic-offset: 8
+ * End:
+ */