1 /* Copyright (c) 2006-2020. 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 Mailbox* mailbox_ = nullptr;
23 kernel::actor::ActorImpl* sender_ = nullptr;
24 kernel::actor::ActorImpl* receiver_ = nullptr;
26 void* dst_buff_ = nullptr;
27 size_t dst_buff_size_ = 0;
28 void* src_buff_ = nullptr;
29 size_t src_buff_size_ = sizeof(void*);
30 /* FIXME: expose these elements in the API */
31 bool detached_ = false;
32 bool (*match_fun_)(void*, void*, kernel::activity::CommImpl*) = nullptr;
33 void (*clean_fun_)(void*) = nullptr;
34 void (*copy_data_function_)(kernel::activity::CommImpl*, void*, size_t) = nullptr;
40 friend Mailbox; // Factory of comms
45 static xbt::signal<void(Comm const&, Actor const&)> on_sender_start;
46 static xbt::signal<void(Comm const&, Actor const&)> on_receiver_start;
47 static xbt::signal<void(Comm const&, Actor const&)> on_completion;
49 /*! take a vector s4u::CommPtr and return when one of them is finished.
50 * The return value is the rank of the first finished CommPtr. */
51 static int wait_any(const std::vector<CommPtr>* comms) { return wait_any_for(comms, -1); }
52 /*! Same as wait_any, but with a timeout. Return -1 if the timeout occurs.*/
53 static int wait_any_for(const std::vector<CommPtr>* comms_in, double timeout);
55 /*! take a vector s4u::CommPtr and return when all of them is finished. */
56 static void wait_all(const std::vector<CommPtr>* comms);
57 /*! take a vector s4u::CommPtr and return the rank of the first finished one (or -1 if none is done). */
58 static int test_any(const std::vector<CommPtr>* comms);
60 Comm* start() override;
61 Comm* wait() override;
62 Comm* wait_for(double timeout) override;
63 Comm* cancel() override;
66 /** Start the comm, and ignore its result. It can be completely forgotten after that. */
68 /** Start the comm, and ignore its result. It can be completely forgotten after that. */
69 Comm* detach(void (*clean_function)(void*))
71 clean_fun_ = clean_function;
75 /** Sets the maximal communication rate (in byte/sec). Must be done before start */
76 CommPtr set_rate(double rate);
78 /** Specify the data to send.
80 * This is way will get actually copied over to the receiver.
81 * That's completely unrelated from the simulated size (given with @ref Activity::set_remaining()):
82 * you can send a short buffer in your simulator, that represents a very large message
83 * in the simulated world, or the opposite.
85 CommPtr set_src_data(void* buff);
86 /** Specify the size of the data to send. Not to be mixed with @ref Activity::set_remaining()
88 * That's the size of the data to actually copy in the simulator (ie, the data passed with Activity::set_src_data()).
89 * That's completely unrelated from the simulated size (given with @ref Activity::set_remaining()):
90 * you can send a short buffer in your simulator, that represents a very large message
91 * in the simulated world, or the opposite.
93 CommPtr set_src_data_size(size_t size);
94 /** Specify the data to send and its size. Don't mix the size with @ref Activity::set_remaining()
96 * This is way will get actually copied over to the receiver.
97 * That's completely unrelated from the simulated size (given with @ref Activity::set_remaining()):
98 * you can send a short buffer in your simulator, that represents a very large message
99 * in the simulated world, or the opposite.
101 CommPtr set_src_data(void* buff, size_t size);
103 /** Specify where to receive the data.
105 * That's a buffer where the sent data will be copied */
106 CommPtr set_dst_data(void** buff);
107 /** Specify the buffer in which the data should be received
109 * That's a buffer where the sent data will be copied */
110 CommPtr set_dst_data(void** buff, size_t size);
112 /** Retrieve the mailbox on which this comm acts */
113 Mailbox* get_mailbox() const;
114 /** Retrieve the size of the received data. Not to be mixed with @ref Activity::set_remaining() */
115 size_t get_dst_data_size() const;
117 Actor* get_sender() const;
120 } // namespace simgrid
122 #endif /* SIMGRID_S4U_COMM_HPP */