1 /* Copyright (c) 2006-2022. 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>
17 /** @brief Communication async
19 * Represents all asynchronous communications, that you can test or wait onto.
21 class XBT_PUBLIC Comm : public Activity_T<Comm> {
22 friend Mailbox; // Factory of comms
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 /* specified only for direct host-to-host communications */
34 Host* from_ = nullptr;
37 /* FIXME: expose these elements in the API */
38 bool detached_ = false;
39 bool (*match_fun_)(void*, void*, kernel::activity::CommImpl*) = nullptr;
40 void (*clean_fun_)(void*) = nullptr;
41 void (*copy_data_function_)(kernel::activity::CommImpl*, void*, size_t) = nullptr;
46 /* signals and related callbacks */
48 /* FIXME signals should be private */
49 static xbt::signal<void(Comm const&)> on_send;
50 static xbt::signal<void(Comm const&)> on_recv;
51 static xbt::signal<void(Comm const&)> on_start;
52 static xbt::signal<void(Comm const&)> on_completion;
55 static void on_send_cb(const std::function<void(Comm const&)>& cb) { on_send.connect(cb); }
56 static void on_recv_cb(const std::function<void(Comm const&)>& cb) { on_recv.connect(cb); }
57 static void on_start_cb(const std::function<void(Comm const&)>& cb) { on_start.connect(cb); }
58 static void on_completion_cb(const std::function<void(Activity const&)>& cb) { on_completion.connect(cb); }
60 CommPtr set_copy_data_callback(void (*callback)(kernel::activity::CommImpl*, void*, size_t));
61 static void copy_buffer_callback(kernel::activity::CommImpl*, void*, size_t);
62 static void copy_pointer_callback(kernel::activity::CommImpl*, void*, size_t);
66 /* "One-sided" communications. This way of communicating bypasses the mailbox and actors mechanism. It creates a
67 * communication (vetoabled, asynchronous, or synchronous) directly between two hosts. There is really no limit on
68 * the hosts involved. In particular, the actor creating such a communication does not have to be on one of the
69 * involved hosts! Enjoy the comfort of the simulator :)
71 static CommPtr sendto_init(); /* Source and Destination hosts have to be set before the communication can start */
72 static CommPtr sendto_init(Host* from, Host* to);
73 static CommPtr sendto_async(Host* from, Host* to, uint64_t simulated_size_in_bytes);
74 static void sendto(Host* from, Host* to, uint64_t simulated_size_in_bytes);
76 CommPtr set_source(Host* from);
77 Host* get_source() const { return from_; }
78 CommPtr set_destination(Host* to);
79 Host* get_destination() const { return to_; }
81 /* Mailbox-based communications */
82 CommPtr set_mailbox(Mailbox* mailbox);
83 /** Retrieve the mailbox on which this comm acts */
84 Mailbox* get_mailbox() const { return mailbox_; }
86 /** Specify the data to send.
89 * This is way will get actually copied over to the receiver.
90 * That's completely unrelated from the simulated size (given by :cpp:func:`simgrid::s4u::Comm::set_payload_size`):
91 * you can send a short buffer in your simulator, that represents a very large message
92 * in the simulated world, or the opposite.
95 CommPtr set_src_data(void* buff);
96 /** Specify the size of the data to send (not to be mixed with set_payload_size())
99 * That's the size of the data to actually copy in the simulator (ie, the data passed with
100 * :cpp:func:`simgrid::s4u::Comm::set_src_data`). That's completely unrelated from the simulated size (given by
101 * :cpp:func:`simgrid::s4u::Comm::set_payload_size`)): you can send a short buffer in your simulator, that represents
102 * a very large message in the simulated world, or the opposite.
105 CommPtr set_src_data_size(size_t size);
106 /** Specify the data to send and its size (not to be mixed with set_payload_size())
109 * This is way will get actually copied over to the receiver.
110 * That's completely unrelated from the simulated size (given by :cpp:func:`simgrid::s4u::Comm::set_payload_size`):
111 * you can send a short buffer in your simulator, that represents a very large message
112 * in the simulated world, or the opposite.
115 CommPtr set_src_data(void* buff, size_t size);
117 /** Specify where to receive the data.
119 * That's a buffer where the sent data will be copied */
120 CommPtr set_dst_data(void** buff);
121 /** Specify the buffer in which the data should be received
123 * That's a buffer where the sent data will be copied */
124 CommPtr set_dst_data(void** buff, size_t size);
125 /** Retrieve where the data will be copied on the receiver side */
126 void* get_dst_data() { return dst_buff_; }
127 /** Retrieve the size of the received data. Not to be mixed with @ref Activity::set_remaining() */
128 size_t get_dst_data_size() const { return dst_buff_size_; }
130 /* Common functions */
132 /** Specify the amount of bytes which exchange should be simulated (not to be mixed with set_src_data_size())
135 * That's the size of the simulated data, that's completely unrelated from the actual data size (given by
136 * :cpp:func:`simgrid::s4u::Comm::set_src_data_size`).
139 CommPtr set_payload_size(uint64_t bytes);
140 /** Sets the maximal communication rate (in byte/sec). Must be done before start */
141 CommPtr set_rate(double rate);
143 bool is_assigned() const override { return (to_ != nullptr && from_ != nullptr) || (mailbox_ != nullptr); }
144 Actor* get_sender() const;
146 /* Comm life cycle */
147 Comm* start() override;
148 /** Start the comm, and ignore its result. It can be completely forgotten after that. */
150 /** Start the comm, and ignore its result. It can be completely forgotten after that. */
151 Comm* detach(void (*clean_function)(void*))
153 clean_fun_ = clean_function;
157 Comm* wait_for(double timeout) override;
159 /*! take a vector s4u::CommPtr and return the rank of the first finished one (or -1 if none is done). */
160 static ssize_t test_any(const std::vector<CommPtr>& comms);
162 /*! take a vector s4u::CommPtr and return when one of them is finished.
163 * The return value is the rank of the first finished CommPtr. */
164 static ssize_t wait_any(const std::vector<CommPtr>& comms) { return wait_any_for(comms, -1); }
165 /*! Same as wait_any, but with a timeout. Return -1 if the timeout occurs.*/
166 static ssize_t wait_any_for(const std::vector<CommPtr>& comms, double timeout);
168 /*! take a vector s4u::CommPtr and return when all of them is finished. */
169 static void wait_all(const std::vector<CommPtr>& comms);
170 /*! Same as wait_all, but with a timeout. Return the number of terminated comm (less than comms.size() if the timeout
172 static size_t wait_all_for(const std::vector<CommPtr>& comms, double timeout);
175 XBT_ATTRIB_DEPRECATED_v332("Please use a plain vector for parameter") static int wait_any(
176 const std::vector<CommPtr>* comms)
178 return static_cast<int>(wait_any_for(*comms, -1));
180 XBT_ATTRIB_DEPRECATED_v332("Please use a plain vector for first parameter") static int wait_any_for(
181 const std::vector<CommPtr>* comms, double timeout)
183 return static_cast<int>(wait_any_for(*comms, timeout));
185 XBT_ATTRIB_DEPRECATED_v332("Please use a plain vector for parameter") static void wait_all(
186 const std::vector<CommPtr>* comms)
190 XBT_ATTRIB_DEPRECATED_v332("Please use a plain vector for parameter") static int test_any(
191 const std::vector<CommPtr>* comms)
193 return static_cast<int>(test_any(*comms));
198 } // namespace simgrid
200 #endif /* SIMGRID_S4U_COMM_HPP */