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_MAILBOX_HPP
7 #define SIMGRID_S4U_MAILBOX_HPP
9 #include <simgrid/forward.h>
10 #include <simgrid/s4u/Actor.hpp>
11 #include <smpi/forward.hpp>
12 #include <xbt/string.hpp>
19 /** @brief Mailboxes: Network rendez-vous points. */
20 class XBT_PUBLIC Mailbox {
23 friend kernel::activity::MailboxImpl;
25 kernel::activity::MailboxImpl* const pimpl_;
27 explicit Mailbox(kernel::activity::MailboxImpl * mbox) : pimpl_(mbox) {}
31 kernel::activity::MailboxImpl* get_impl() const { return pimpl_; }
34 /** @brief Retrieves the name of that mailbox as a C++ string */
35 const xbt::string& get_name() const;
36 /** @brief Retrieves the name of that mailbox as a C string */
37 const char* get_cname() const;
39 /** Retrieve the mailbox associated to the given name. Mailboxes are created on demand. */
40 static Mailbox* by_name(const std::string& name);
42 /** Returns whether the mailbox contains queued communications */
45 /** Check if there is a communication going on in a mailbox. */
48 /** Check if there is a communication ready to be consumed from a mailbox. */
51 /** Gets the first element in the queue (without dequeuing it), or nullptr if none is there */
52 kernel::activity::CommImplPtr front();
54 /** Declare that the specified actor is a permanent receiver on that mailbox
56 * It means that the communications sent to this mailbox will start flowing to
57 * its host even before it does a get(). This models the real behavior of TCP
58 * and MPI communications, amongst other. It will improve the accuracy of
59 * predictions, in particular if your application exhibits swarms of small messages.
61 * SimGrid does not enforces any kind of ownership over the mailbox. Even if a receiver
62 * was declared, any other actors can still get() data from the mailbox. The timings
63 * will then probably be off tracks, so you should strive on your side to not get data
64 * from someone else's mailbox.
66 * Note that being permanent receivers of a mailbox prevents actors to be garbage-collected.
67 * If your simulation creates many short-lived actors that marked as permanent receiver, you
68 * should call mailbox->set_receiver(nullptr) by the end of the actors so that their memory gets
69 * properly reclaimed. This call should be at the end of the actor's function, not in a on_exit
72 void set_receiver(ActorPtr actor);
74 /** Return the actor declared as permanent receiver, or nullptr if none **/
75 ActorPtr get_receiver();
77 /** Creates (but don't start) a data transmission to that mailbox */
79 /** Creates (but don't start) a data transmission to that mailbox */
80 CommPtr put_init(void* data, uint64_t simulated_size_in_bytes);
81 /** Creates and start a data transmission to that mailbox */
82 CommPtr put_async(void* data, uint64_t simulated_size_in_bytes);
84 smx_activity_t iprobe(int type, bool (*match_fun)(void*, void*, kernel::activity::CommImpl*), void* data);
85 /** Blocking data transmission */
86 void put(void* payload, uint64_t simulated_size_in_bytes);
87 /** Blocking data transmission with timeout */
88 void put(void* payload, uint64_t simulated_size_in_bytes, double timeout);
90 /** Creates (but don't start) a data reception onto that mailbox */
92 /** Creates and start an async data reception to that mailbox */
93 CommPtr get_async(void** data);
95 /** Blocking data reception */
96 void* get(); // FIXME: make a typed template version
97 /** Blocking data reception with timeout */
98 void* get(double timeout);
102 } // namespace simgrid
104 #endif /* SIMGRID_S4U_MAILBOX_HPP */