Electroneum
rtt.h
Go to the documentation of this file.
1 /*
2  * util/rtt.h - UDP round trip time estimator for resend timeouts.
3  *
4  * Copyright (c) 2007, NLnet Labs. All rights reserved.
5  *
6  * This software is open source.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  *
19  * Neither the name of the NLNET LABS nor the names of its contributors may
20  * be used to endorse or promote products derived from this software without
21  * specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27  * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
29  * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
30  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34  */
35 
43 #ifndef UTIL_RTT_H
44 #define UTIL_RTT_H
45 
49 struct rtt_info {
51  int srtt;
53  int rttvar;
55  int rto;
56 };
57 
59 extern int RTT_MIN_TIMEOUT;
61 #define RTT_MAX_TIMEOUT 120000
62 
67 void rtt_init(struct rtt_info* rtt);
68 
74 int rtt_timeout(const struct rtt_info* rtt);
75 
82 int rtt_unclamped(const struct rtt_info* rtt);
83 
89 int rtt_notimeout(const struct rtt_info* rtt);
90 
96 void rtt_update(struct rtt_info* rtt, int ms);
97 
105 void rtt_lost(struct rtt_info* rtt, int orig);
106 
107 #endif /* UTIL_RTT_H */
void rtt_update(struct rtt_info *rtt, int ms)
int rto
Definition: rtt.h:55
int rttvar
Definition: rtt.h:53
void rtt_lost(struct rtt_info *rtt, int orig)
int srtt
Definition: rtt.h:51
int rtt_timeout(const struct rtt_info *rtt)
void rtt_init(struct rtt_info *rtt)
int rtt_notimeout(const struct rtt_info *rtt)
Definition: rtt.h:49
int rtt_unclamped(const struct rtt_info *rtt)
int RTT_MIN_TIMEOUT