1 /* Copyright (c) 2006-2016. 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_ACTOR_HPP
7 #define SIMGRID_S4U_ACTOR_HPP
11 #include <simgrid/simix.h>
12 #include <simgrid/s4u/forward.hpp>
19 * An actor is an independent stream of execution in your distributed application.
21 * You can think of an actor as a process in your distributed application, or as a thread in a multithreaded program.
22 * This is the only component in SimGrid that actually does something on its own, executing its own code.
23 * A resource will not get used if you don't schedule activities on them. This is the code of Actors that create and schedule these activities.
25 * An actor is located on a (simulated) host, but it can interact
26 * with the whole simulated platform.
28 * The s4u::Actor API is strongly inspired from the C++11 threads.
29 * The <a href="http://en.cppreference.com/w/cpp/thread">documentation
30 * of this standard</a> may help to understand the philosophy of the S4U
33 * @section s4u_actor_def Defining the skeleton of an Actor
35 * %As in the <a href="http://en.cppreference.com/w/cpp/thread">C++11
36 * standard</a>, you can declare the code of your actor either as a
37 * pure function or as an object. It is very simple with functions:
40 * #include "s4u/actor.hpp"
42 * // Declare the code of your worker
44 * printf("Hello s4u");
45 * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
48 * // From your main or from another actor, create your actor on the host Jupiter
49 * // The following line actually creates a new actor, even if there is no "new".
50 * Actor("Alice", simgrid::s4u::Host::by_name("Jupiter"), worker);
53 * But some people prefer to encapsulate their actors in classes and
54 * objects to save the actor state in a cleanly dedicated location.
55 * The syntax is slightly more complicated, but not much.
58 * #include "s4u/actor.hpp"
60 * // Declare the class representing your actors
63 * void operator()() { // Two pairs of () because this defines the method called ()
64 * printf("Hello s4u");
65 * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
69 * // From your main or from another actor, create your actor. Note the () after Worker
70 * Actor("Bob", simgrid::s4u::Host::by_name("Jupiter"), Worker());
73 * @section s4u_actor_flesh Fleshing your actor
75 * The body of your actor can use the functions of the
76 * simgrid::s4u::this_actor namespace to interact with the world.
77 * This namespace contains the methods to start new activities
78 * (executions, communications, etc), and to get informations about
79 * the currently running thread (its location, etc).
81 * Please refer to the @link simgrid::s4u::this_actor full API @endlink.
84 * @section s4u_actor_deploy Using a deployment file
86 * @warning This is currently not working with S4U. Sorry about that.
88 * The best practice is to use an external deployment file as
89 * follows, because it makes it easier to test your application in
90 * differing settings. Load this file with
91 * s4u::Engine::loadDeployment() before the simulation starts.
92 * Refer to the @ref deployment section for more information.
95 * <?xml version='1.0'?>
96 * <!DOCTYPE platform SYSTEM "http://simgrid.gforge.inria.fr/simgrid/simgrid.dtd">
97 * <platform version="4">
99 * <!-- Start a process called 'master' on the host called 'Tremblay' -->
100 * <process host="Tremblay" function="master">
101 * <!-- Here come the parameter that you want to feed to this instance of master -->
102 * <argument value="20"/> <!-- argv[1] -->
103 * <argument value="50000000"/> <!-- argv[2] -->
104 * <argument value="1000000"/> <!-- argv[3] -->
105 * <argument value="5"/> <!-- argv[4] -->
108 * <!-- Start a process called 'worker' on the host called 'Jupiter' -->
109 * <process host="Jupiter" function="worker"/> <!-- Don't provide any parameter ->>
117 /** @brief Simulation Agent (see \ref s4u_actor)*/
118 XBT_PUBLIC_CLASS Actor {
120 Actor() : pimpl_(nullptr) {}
121 Actor(smx_process_t smx_proc) :
122 pimpl_(SIMIX_process_ref(smx_proc)) {}
125 SIMIX_process_unref(pimpl_);
128 // Copy+move (with the copy-and-swap idiom):
129 Actor(Actor const& actor) : pimpl_(SIMIX_process_ref(actor.pimpl_)) {}
130 friend void swap(Actor& first, Actor& second)
133 swap(first.pimpl_, second.pimpl_);
135 Actor& operator=(Actor actor)
140 Actor(Actor&& actor) : pimpl_(nullptr)
145 Actor(const char* name, s4u::Host *host, double killTime, std::function<void()> code);
146 Actor(const char* name, s4u::Host *host, std::function<void()> code)
147 : Actor(name, host, -1, std::move(code)) {};
149 Actor(const char* name, s4u::Host *host, C code)
150 : Actor(name, host, -1, std::function<void()>(std::move(code))) {}
152 /** Retrieves the actor that have the given PID (or NULL if not existing) */
153 //static Actor *byPid(int pid); not implemented
155 /** Retrieves the name of that actor */
156 const char* getName();
157 /** Retrieves the host on which that actor is running */
158 s4u::Host *getHost();
159 /** Retrieves the PID of that actor */
162 /** If set to true, the actor will automatically restart when its host reboots */
163 void setAutoRestart(bool autorestart);
164 /** Sets the time at which that actor should be killed */
165 void setKillTime(double time);
166 /** Retrieves the time at which that actor will be killed (or -1 if not set) */
167 double getKillTime();
169 /** Ask the actor to die.
171 * It will only notice your request when doing a simcall next time (a communication or similar).
172 * SimGrid sometimes have issues when you kill actors that are currently communicating and such. We are working on it to fix the issues.
176 static void kill(int pid);
179 * Wait for the actor to finish.
183 // Static methods on all actors:
185 /** Ask kindly to all actors to die. Only the issuer will survive. */
186 static void killAll();
189 smx_process_t pimpl_ = nullptr;
193 * @brief Static methods working on the current actor (see @ref s4u::Actor) */
194 namespace this_actor {
196 /** Block the actor sleeping for that amount of seconds (may throws hostFailure) */
197 XBT_PUBLIC(void) sleep(double duration);
199 /** Block the actor, computing the given amount of flops */
200 XBT_PUBLIC(e_smx_state_t) execute(double flop);
202 /** Block the actor until it gets a message from the given mailbox.
204 * See \ref Comm for the full communication API (including non blocking communications).
206 XBT_PUBLIC(void*) recv(Mailbox &chan);
208 /** Block the actor until it delivers a message of the given simulated size to the given mailbox
210 * See \ref Comm for the full communication API (including non blocking communications).
212 XBT_PUBLIC(void) send(Mailbox &chan, void*payload, size_t simulatedSize);
218 }} // namespace simgrid::s4u
221 #endif /* SIMGRID_S4U_ACTOR_HPP */