1 /* Copyright (c) 2016-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "simgrid/s4u.hpp"
10 #include <xbt/RngStream.h>
13 #define MAX_SIMULATION_TIME 1000
14 #define PERIODIC_STABILIZE_DELAY 20
15 #define PERIODIC_FIX_FINGERS_DELAY 120
16 #define PERIODIC_CHECK_PREDECESSOR_DELAY 120
17 #define PERIODIC_LOOKUP_DELAY 10
18 #define SLEEP_DELAY 4.9999
26 simgrid::s4u::Host* host = nullptr;
29 static simgrid::xbt::Extension<simgrid::s4u::Host, HostChord> EXTENSION_ID;
31 explicit HostChord(simgrid::s4u::Host* ptr) : host(ptr)
33 std::string descr = std::string("RngSream<") + host->get_cname() + ">";
34 stream_ = RngStream_CreateStream(descr.c_str());
37 ~HostChord() { RngStream_DeleteStream(&stream_); };
39 RngStream getStream() { return stream_; };
42 /* Types of tasks exchanged between nodes. */
43 enum e_message_type_t {
45 FIND_SUCCESSOR_ANSWER,
47 GET_PREDECESSOR_ANSWER,
52 PREDECESSOR_ALIVE_ANSWER
57 e_message_type_t type; // type of message
58 std::string issuer_host_name; // used for logging
59 int request_id = -1; // id (used by some types of messages)
60 int request_finger = 1; // finger parameter (used by some types of messages)
61 int answer_id = -1; // answer (used by some types of messages)
62 simgrid::s4u::MailboxPtr answer_to; // mailbox to send an answer to (if any)
64 explicit ChordMessage(e_message_type_t type)
65 : type(type), issuer_host_name(simgrid::s4u::this_actor::get_host()->get_name())
69 ~ChordMessage() = default;
71 static void destroy(void* message);
76 double start_time_ = -1;
77 double deadline_ = -1;
80 int pred_id_ = -1; // predecessor id
81 simgrid::s4u::MailboxPtr mailbox_; // my mailbox
82 int* fingers_; // finger table,(fingers[0] is my successor)
83 int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
87 explicit Node(std::vector<std::string> args);
88 Node(const Node&) = delete;
89 Node& operator=(const Node&) = delete;
91 void join(int known_id);
96 void setFinger(int finger_index, int id);
98 void printFingerTable();
100 void setPredecessor(int predecessor_id);
101 void checkPredecessor();
102 int remoteGetPredecessor(int ask_to);
103 int closestPrecedingFinger(int id);
104 int findSuccessor(int id);
105 int remoteFindSuccessor(int ask_to, int id);
107 void notify(int predecessor_candidate_id);
108 void remoteNotify(int notify_id, int predecessor_candidate_id);
110 void handleMessage(ChordMessage* message);
114 simgrid::s4u::this_actor::sleep_for(start_time_);
115 if (known_id_ == -1) {
116 setPredecessor(-1); // -1 means that I have no predecessor
125 void* data = nullptr;
126 double now = simgrid::s4u::Engine::get_clock();
127 double next_stabilize_date = start_time_ + PERIODIC_STABILIZE_DELAY;
128 double next_fix_fingers_date = start_time_ + PERIODIC_FIX_FINGERS_DELAY;
129 double next_check_predecessor_date = start_time_ + PERIODIC_CHECK_PREDECESSOR_DELAY;
130 double next_lookup_date = start_time_ + PERIODIC_LOOKUP_DELAY;
131 simgrid::s4u::CommPtr comm_receive = nullptr;
132 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME) {
133 if (comm_receive == nullptr)
134 comm_receive = mailbox_->get_async(&data);
135 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME && not comm_receive->test()) {
136 // no task was received: make some periodic calls
137 if (now >= next_stabilize_date) {
139 next_stabilize_date = simgrid::s4u::Engine::get_clock() + PERIODIC_STABILIZE_DELAY;
140 } else if (now >= next_fix_fingers_date) {
142 next_fix_fingers_date = simgrid::s4u::Engine::get_clock() + PERIODIC_FIX_FINGERS_DELAY;
143 } else if (now >= next_check_predecessor_date) {
145 next_check_predecessor_date = simgrid::s4u::Engine::get_clock() + PERIODIC_CHECK_PREDECESSOR_DELAY;
146 } else if (now >= next_lookup_date) {
148 next_lookup_date = simgrid::s4u::Engine::get_clock() + PERIODIC_LOOKUP_DELAY;
150 // nothing to do: sleep for a while
151 simgrid::s4u::this_actor::sleep_for(SLEEP_DELAY);
153 now = simgrid::s4u::Engine::get_clock();
156 if (data != nullptr) {
157 ChordMessage* message = static_cast<ChordMessage*>(data);
158 handleMessage(message);
159 comm_receive = nullptr;
162 now = simgrid::s4u::Engine::get_clock();
164 if (comm_receive != nullptr) {
165 if (comm_receive->test())
166 delete static_cast<ChordMessage*>(data);
168 comm_receive->cancel();