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diff --git a/src/openvpn/perf.h b/src/openvpn/perf.h
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+/*
+ * OpenVPN -- An application to securely tunnel IP networks
+ * over a single TCP/UDP port, with support for SSL/TLS-based
+ * session authentication and key exchange,
+ * packet encryption, packet authentication, and
+ * packet compression.
+ *
+ * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * This program 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 this program (see the file COPYING included with this
+ * distribution); if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ * The interval_ routines are designed to optimize the calling of a routine
+ * (normally tls_multi_process()) which can be called less frequently
+ * between triggers.
+ */
+
+#ifndef PERF_H
+#define PERF_H
+
+/*#define ENABLE_PERFORMANCE_METRICS*/
+
+/*
+ * Metrics
+ */
+#define PERF_BIO_READ_PLAINTEXT 0
+#define PERF_BIO_WRITE_PLAINTEXT 1
+#define PERF_BIO_READ_CIPHERTEXT 2
+#define PERF_BIO_WRITE_CIPHERTEXT 3
+#define PERF_TLS_MULTI_PROCESS 4
+#define PERF_IO_WAIT 5
+#define PERF_EVENT_LOOP 6
+#define PERF_MULTI_CREATE_INSTANCE 7
+#define PERF_MULTI_CLOSE_INSTANCE 8
+#define PERF_MULTI_SHOW_STATS 9
+#define PERF_MULTI_BCAST 10
+#define PERF_MULTI_MCAST 11
+#define PERF_SCRIPT 12
+#define PERF_READ_IN_LINK 13
+#define PERF_PROC_IN_LINK 14
+#define PERF_READ_IN_TUN 15
+#define PERF_PROC_IN_TUN 16
+#define PERF_PROC_OUT_LINK 17
+#define PERF_PROC_OUT_TUN 18
+#define PERF_PROC_OUT_TUN_MTCP 19
+#define PERF_N 20
+
+#ifdef ENABLE_PERFORMANCE_METRICS
+
+#include "basic.h"
+
+/*
+ * Stack size
+ */
+#define STACK_N 64
+
+void perf_push (int type);
+void perf_pop (void);
+void perf_output_results (void);
+
+#else
+
+static inline void perf_push (int type) {}
+static inline void perf_pop (void) {}
+static inline void perf_output_results (void) {}
+
+#endif
+
+#endif