1 /* Copyright (c) 2006-2023. 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. */
6 #ifndef SIMGRID_S4U_COMM_HPP
7 #define SIMGRID_S4U_COMM_HPP
9 #include <simgrid/forward.h>
10 #include <simgrid/s4u/Activity.hpp>
15 namespace simgrid::s4u {
16 /** @brief Communication async
18 * Represents all asynchronous communications, that you can test or wait onto.
20 class XBT_PUBLIC Comm : public Activity_T<Comm> {
21 friend Mailbox; // Factory of comms
22 friend kernel::activity::CommImpl;
23 /* specified for normal mailbox-based communications*/
24 Mailbox* mailbox_ = nullptr;
25 kernel::actor::ActorImpl* sender_ = nullptr;
26 kernel::actor::ActorImpl* receiver_ = nullptr;
28 void* dst_buff_ = nullptr;
29 size_t dst_buff_size_ = 0;
30 void* src_buff_ = nullptr;
31 size_t src_buff_size_ = sizeof(void*);
33 /* FIXME: expose these elements in the API */
34 bool detached_ = false;
35 std::function<bool(void*, void*, kernel::activity::CommImpl*)> match_fun_;
36 std::function<void(void*)> clean_fun_;
37 std::function<void(kernel::activity::CommImpl*, void*, size_t)> copy_data_function_;
40 Comm* do_start() override;
43 static xbt::signal<void(Comm const&)> on_send;
44 static xbt::signal<void(Comm const&)> on_recv;
45 inline static xbt::signal<void(Comm const&)> on_start;
46 xbt::signal<void(Comm const&)> on_this_start;
48 void fire_on_completion() const override {
49 /* The completion signal of a Comm has to be thrown only once and not by the sender AND the receiver.
50 then Comm::on_completion is thrown in the kernel in CommImpl::finish.
53 void fire_on_veto() const override { on_veto(const_cast<Comm&>(*this)); }
54 void fire_on_suspend() const override { on_suspend(*this); }
55 void fire_on_resume() const override { on_resume(*this); }
58 static void on_send_cb(const std::function<void(Comm const&)>& cb) { on_send.connect(cb); }
59 static void on_recv_cb(const std::function<void(Comm const&)>& cb) { on_recv.connect(cb); }
60 static void on_start_cb(const std::function<void(Comm const&)>& cb) { on_start.connect(cb); }
61 void on_this_start_cb(const std::function<void(Comm const&)>& cb) { on_this_start.connect(cb); }
63 CommPtr set_copy_data_callback(const std::function<void(kernel::activity::CommImpl*, void*, size_t)>& callback);
64 XBT_ATTRIB_DEPRECATED_v337("Please manifest if you actually need this function") static void copy_buffer_callback(
65 kernel::activity::CommImpl*, void*, size_t);
66 XBT_ATTRIB_DEPRECATED_v337("Please manifest if you actually need this function") static void copy_pointer_callback(
67 kernel::activity::CommImpl*, void*, size_t);
71 static void send(kernel::actor::ActorImpl* sender, const Mailbox* mbox, double task_size, double rate, void* src_buff,
73 const std::function<bool(void*, void*, simgrid::kernel::activity::CommImpl*)>& match_fun,
74 const std::function<void(simgrid::kernel::activity::CommImpl*, void*, size_t)>& copy_data_fun,
75 void* data, double timeout);
76 static void recv(kernel::actor::ActorImpl* receiver, const Mailbox* mbox, void* dst_buff, size_t* dst_buff_size,
77 const std::function<bool(void*, void*, simgrid::kernel::activity::CommImpl*)>& match_fun,
78 const std::function<void(simgrid::kernel::activity::CommImpl*, void*, size_t)>& copy_data_fun,
79 void* data, double timeout, double rate);
81 /* "One-sided" communications. This way of communicating bypasses the mailbox and actors mechanism. It creates a
82 * communication (vetoabled, asynchronous, or synchronous) directly between two hosts. There is really no limit on
83 * the hosts involved. In particular, the actor creating such a communication does not have to be on one of the
84 * involved hosts! Enjoy the comfort of the simulator :)
86 static CommPtr sendto_init(); /* Source and Destination hosts have to be set before the communication can start */
87 static CommPtr sendto_init(Host* from, Host* to);
88 static CommPtr sendto_async(Host* from, Host* to, uint64_t simulated_size_in_bytes);
89 static void sendto(Host* from, Host* to, uint64_t simulated_size_in_bytes);
91 CommPtr set_source(Host* from);
92 Host* get_source() const;
93 CommPtr set_destination(Host* to);
94 Host* get_destination() const;
96 /* Mailbox-based communications */
97 CommPtr set_mailbox(Mailbox* mailbox);
98 /** Retrieve the mailbox on which this comm acts */
99 Mailbox* get_mailbox() const { return mailbox_; }
101 /** Specify the data to send.
104 * This is way will get actually copied over to the receiver.
105 * That's completely unrelated from the simulated size (given by :cpp:func:`simgrid::s4u::Comm::set_payload_size`):
106 * you can send a short buffer in your simulator, that represents a very large message
107 * in the simulated world, or the opposite.
110 CommPtr set_src_data(void* buff);
111 /** Specify the size of the data to send (not to be mixed with set_payload_size())
114 * That's the size of the data to actually copy in the simulator (ie, the data passed with
115 * :cpp:func:`simgrid::s4u::Comm::set_src_data`). That's completely unrelated from the simulated size (given by
116 * :cpp:func:`simgrid::s4u::Comm::set_payload_size`)): you can send a short buffer in your simulator, that represents
117 * a very large message in the simulated world, or the opposite.
120 CommPtr set_src_data_size(size_t size);
121 /** Specify the data to send and its size (not to be mixed with set_payload_size())
124 * This is way will get actually copied over to the receiver.
125 * That's completely unrelated from the simulated size (given by :cpp:func:`simgrid::s4u::Comm::set_payload_size`):
126 * you can send a short buffer in your simulator, that represents a very large message
127 * in the simulated world, or the opposite.
130 CommPtr set_src_data(void* buff, size_t size);
132 /** Specify where to receive the data.
134 * That's a buffer where the sent data will be copied */
135 CommPtr set_dst_data(void** buff);
136 /** Specify the buffer in which the data should be received
138 * That's a buffer where the sent data will be copied */
139 CommPtr set_dst_data(void** buff, size_t size);
140 /** Retrieve where the data will be copied on the receiver side */
141 void* get_dst_data() const { return dst_buff_; }
142 /** Retrieve the size of the received data. Not to be mixed with @ref Activity::get_remaining() */
143 size_t get_dst_data_size() const { return dst_buff_size_; }
145 /* Common functions */
147 /** Specify the amount of bytes which exchange should be simulated (not to be mixed with set_src_data_size())
150 * That's the size of the simulated data, that's completely unrelated from the actual data size (given by
151 * :cpp:func:`simgrid::s4u::Comm::set_src_data_size`).
154 CommPtr set_payload_size(uint64_t bytes);
155 /** Sets the maximal communication rate (in byte/sec). Must be done before start */
156 CommPtr set_rate(double rate);
158 bool is_assigned() const override;
159 Actor* get_sender() const;
160 Actor* get_receiver() const;
162 /* Comm life cycle */
163 /** Start the comm, and ignore its result. It can be completely forgotten after that. */
165 /** Start the comm, and ignore its result. It can be completely forgotten after that. */
166 Comm* detach(const std::function<void(void*)>& clean_function)
168 clean_fun_ = clean_function;
172 Comm* wait_for(double timeout) override;
174 /*! take a vector s4u::CommPtr and return the rank of the first finished one (or -1 if none is done). */
175 static ssize_t test_any(const std::vector<CommPtr>& comms);
177 /*! take a vector s4u::CommPtr and return when one of them is finished.
178 * The return value is the rank of the first finished CommPtr. */
179 static ssize_t wait_any(const std::vector<CommPtr>& comms) { return wait_any_for(comms, -1); }
180 /*! Same as wait_any, but with a timeout. Return -1 if the timeout occurs.*/
181 static ssize_t wait_any_for(const std::vector<CommPtr>& comms, double timeout);
183 /*! take a vector s4u::CommPtr and return when all of them is finished. */
184 static void wait_all(const std::vector<CommPtr>& comms);
185 /*! Same as wait_all, but with a timeout. Return the number of terminated comm (less than comms.size() if the timeout
187 static size_t wait_all_for(const std::vector<CommPtr>& comms, double timeout);
189 } // namespace simgrid::s4u
191 #endif /* SIMGRID_S4U_COMM_HPP */