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>
20 /** @brief Mailboxes: Network rendez-vous points. */
21 class XBT_PUBLIC Mailbox {
24 friend kernel::activity::MailboxImpl;
26 kernel::activity::MailboxImpl* const pimpl_;
28 explicit Mailbox(kernel::activity::MailboxImpl * mbox) : pimpl_(mbox) {}
32 kernel::activity::MailboxImpl* get_impl() const { return pimpl_; }
35 /** @brief Retrieves the name of that mailbox as a C++ string */
36 const xbt::string& get_name() const;
37 /** @brief Retrieves the name of that mailbox as a C string */
38 const char* get_cname() const;
40 /** Retrieve the mailbox associated to the given name. Mailboxes are created on demand. */
41 static Mailbox* by_name(const std::string& name);
43 /** Returns whether the mailbox contains queued communications */
46 /** Check if there is a communication going on in a mailbox. */
49 /** Look if there is a communication going on in a mailbox and return the PID of the sender actor */
50 aid_t listen_from() const;
52 /** Check if there is a communication ready to be consumed from a mailbox. */
55 /** Gets the first element in the queue (without dequeuing it), or nullptr if none is there */
56 kernel::activity::CommImplPtr front() const;
58 /** Declare that the specified actor is a permanent receiver on that mailbox
60 * It means that the communications sent to this mailbox will start flowing to
61 * its host even before it does a get(). This models the real behavior of TCP
62 * and MPI communications, amongst other. It will improve the accuracy of
63 * predictions, in particular if your application exhibits swarms of small messages.
65 * SimGrid does not enforces any kind of ownership over the mailbox. Even if a receiver
66 * was declared, any other actors can still get() data from the mailbox. The timings
67 * will then probably be off tracks, so you should strive on your side to not get data
68 * from someone else's mailbox.
70 * Note that being permanent receivers of a mailbox prevents actors to be garbage-collected.
71 * If your simulation creates many short-lived actors that marked as permanent receiver, you
72 * should call mailbox->set_receiver(nullptr) by the end of the actors so that their memory gets
73 * properly reclaimed. This call should be at the end of the actor's function, not in an on_exit
76 void set_receiver(ActorPtr actor);
78 /** Return the actor declared as permanent receiver, or nullptr if none **/
79 ActorPtr get_receiver() const;
81 /** Creates (but don't start) a data transmission to that mailbox */
83 /** Creates (but don't start) a data transmission to that mailbox */
84 CommPtr put_init(void* data, uint64_t simulated_size_in_bytes);
85 /** Creates and start a data transmission to that mailbox */
86 CommPtr put_async(void* data, uint64_t simulated_size_in_bytes);
88 kernel::activity::ActivityImplPtr iprobe(int type, bool (*match_fun)(void*, void*, kernel::activity::CommImpl*),
90 /** Blocking data transmission */
91 void put(void* payload, uint64_t simulated_size_in_bytes);
92 /** Blocking data transmission with timeout */
93 void put(void* payload, uint64_t simulated_size_in_bytes, double timeout);
95 /** Creates (but don't start) a data reception onto that mailbox */
97 /** Creates and start an async data reception to that mailbox */
98 XBT_ATTRIB_DEPRECATED_v331("Please use typed template Mailbox::get_async<>()") CommPtr get_async(void** data);
99 template <typename T> CommPtr get_async(T** data) { return get_async<void>(reinterpret_cast<void**>(data)); }
101 /** Blocking data reception */
102 template <typename T> T* get() { return static_cast<T*>(get<void>()); }
103 XBT_ATTRIB_DEPRECATED_v331("Please use typed template Mailbox::get<>()") void* get();
104 template <typename T> std::unique_ptr<T> get_unique() { return std::unique_ptr<T>(get<T>()); }
106 /** Blocking data reception with timeout */
107 template <typename T> T* get(double timeout) { return static_cast<T*>(get<void>(timeout)); }
108 XBT_ATTRIB_DEPRECATED_v331("Please use typed template Mailbox::get<>()") void* get(double timeout);
109 template <typename T> std::unique_ptr<T> get_unique(double timeout) { return std::unique_ptr<T>(get<T>(timeout)); }
112 template <> XBT_PUBLIC CommPtr Mailbox::get_async<void>(void** data);
113 template <> XBT_PUBLIC void* Mailbox::get<void>();
114 template <> XBT_PUBLIC void* Mailbox::get<void>(double timeout);
116 inline CommPtr Mailbox::get_async(void** data) // XBT_ATTRIB_DEPRECATED_v331
118 return get_async<void>(data);
120 inline void* Mailbox::get() // XBT_ATTRIB_DEPRECATED_v331
124 inline void* Mailbox::get(double timeout) // XBT_ATTRIB_DEPRECATED_v331
126 return get<void>(timeout);
130 } // namespace simgrid
132 #endif /* SIMGRID_S4U_MAILBOX_HPP */