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 constexpr double MAX_SIMULATION_TIME = 1000;
14 constexpr double PERIODIC_STABILIZE_DELAY = 20;
15 constexpr double PERIODIC_FIX_FINGERS_DELAY = 120;
16 constexpr double PERIODIC_CHECK_PREDECESSOR_DELAY = 120;
17 constexpr double PERIODIC_LOOKUP_DELAY = 10;
18 constexpr double SLEEP_DELAY = 4.9999;
25 std::unique_ptr<std::remove_pointer<RngStream>::type, std::function<void(RngStream)>> stream_ = {
26 nullptr, [](RngStream stream) { RngStream_DeleteStream(&stream); }};
27 simgrid::s4u::Host* host = nullptr;
30 static simgrid::xbt::Extension<simgrid::s4u::Host, HostChord> EXTENSION_ID;
32 explicit HostChord(simgrid::s4u::Host* ptr) : host(ptr)
34 std::string descr = std::string("RngSream<") + host->get_cname() + ">";
35 stream_.reset(RngStream_CreateStream(descr.c_str()));
37 HostChord(const HostChord&) = delete;
38 HostChord& operator=(const HostChord&) = delete;
40 RngStream getStream() { return stream_.get(); };
43 /* Types of tasks exchanged between nodes. */
44 enum e_message_type_t {
46 FIND_SUCCESSOR_ANSWER,
48 GET_PREDECESSOR_ANSWER,
53 PREDECESSOR_ALIVE_ANSWER
58 e_message_type_t type; // type of message
59 std::string issuer_host_name; // used for logging
60 int request_id = -1; // id (used by some types of messages)
61 int request_finger = 1; // finger parameter (used by some types of messages)
62 int answer_id = -1; // answer (used by some types of messages)
63 simgrid::s4u::Mailbox* answer_to = nullptr; // mailbox to send an answer to (if any)
65 explicit ChordMessage(e_message_type_t type)
66 : type(type), issuer_host_name(simgrid::s4u::this_actor::get_host()->get_name())
70 static void destroy(void* message);
75 double start_time_ = -1;
76 double deadline_ = -1;
79 int pred_id_ = -1; // predecessor id
80 simgrid::s4u::Mailbox* mailbox_; // my mailbox
81 std::vector<int> fingers_; // finger table,(fingers[0] is my successor)
82 int next_finger_to_fix; // index of the next finger to fix in fix_fingers()
86 explicit Node(std::vector<std::string> args);
87 Node(const Node&) = delete;
88 Node& operator=(const Node&) = delete;
89 void join(int known_id);
94 void setFinger(int finger_index, int id);
96 void printFingerTable();
98 void setPredecessor(int predecessor_id);
99 void checkPredecessor();
100 int remoteGetPredecessor(int ask_to);
101 int closestPrecedingFinger(int id);
102 int findSuccessor(int id);
103 int remoteFindSuccessor(int ask_to, int id);
105 void notify(int predecessor_candidate_id);
106 void remoteNotify(int notify_id, int predecessor_candidate_id);
108 void handleMessage(ChordMessage* message);
112 simgrid::s4u::this_actor::sleep_for(start_time_);
113 if (known_id_ == -1) {
114 setPredecessor(-1); // -1 means that I have no predecessor
123 void* data = nullptr;
124 double now = simgrid::s4u::Engine::get_clock();
125 double next_stabilize_date = start_time_ + PERIODIC_STABILIZE_DELAY;
126 double next_fix_fingers_date = start_time_ + PERIODIC_FIX_FINGERS_DELAY;
127 double next_check_predecessor_date = start_time_ + PERIODIC_CHECK_PREDECESSOR_DELAY;
128 double next_lookup_date = start_time_ + PERIODIC_LOOKUP_DELAY;
129 simgrid::s4u::CommPtr comm_receive = nullptr;
130 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME) {
131 if (comm_receive == nullptr)
132 comm_receive = mailbox_->get_async(&data);
133 while ((now < (start_time_ + deadline_)) && now < MAX_SIMULATION_TIME && not comm_receive->test()) {
134 // no task was received: make some periodic calls
135 if (now >= next_stabilize_date) {
137 next_stabilize_date = simgrid::s4u::Engine::get_clock() + PERIODIC_STABILIZE_DELAY;
138 } else if (now >= next_fix_fingers_date) {
140 next_fix_fingers_date = simgrid::s4u::Engine::get_clock() + PERIODIC_FIX_FINGERS_DELAY;
141 } else if (now >= next_check_predecessor_date) {
143 next_check_predecessor_date = simgrid::s4u::Engine::get_clock() + PERIODIC_CHECK_PREDECESSOR_DELAY;
144 } else if (now >= next_lookup_date) {
146 next_lookup_date = simgrid::s4u::Engine::get_clock() + PERIODIC_LOOKUP_DELAY;
148 // nothing to do: sleep for a while
149 simgrid::s4u::this_actor::sleep_for(SLEEP_DELAY);
151 now = simgrid::s4u::Engine::get_clock();
154 if (data != nullptr) {
155 ChordMessage* message = static_cast<ChordMessage*>(data);
156 handleMessage(message);
157 comm_receive = nullptr;
160 now = simgrid::s4u::Engine::get_clock();
162 if (comm_receive != nullptr) {
163 if (comm_receive->test())
164 delete static_cast<ChordMessage*>(data);
166 comm_receive->cancel();