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
14 #include <type_traits>
17 #include <xbt/functional.hpp>
19 #include <simgrid/simix.h>
20 #include <simgrid/s4u/forward.hpp>
27 * An actor is an independent stream of execution in your distributed application.
29 * You can think of an actor as a process in your distributed application, or as a thread in a multithreaded program.
30 * This is the only component in SimGrid that actually does something on its own, executing its own code.
31 * 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.
33 * An actor is located on a (simulated) host, but it can interact
34 * with the whole simulated platform.
36 * The s4u::Actor API is strongly inspired from the C++11 threads.
37 * The <a href="http://en.cppreference.com/w/cpp/thread">documentation
38 * of this standard</a> may help to understand the philosophy of the S4U
41 * @section s4u_actor_def Defining the skeleton of an Actor
43 * %As in the <a href="http://en.cppreference.com/w/cpp/thread">C++11
44 * standard</a>, you can declare the code of your actor either as a
45 * pure function or as an object. It is very simple with functions:
48 * #include "s4u/actor.hpp"
50 * // Declare the code of your worker
52 * printf("Hello s4u");
53 * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
56 * // From your main or from another actor, create your actor on the host Jupiter
57 * // The following line actually creates a new actor, even if there is no "new".
58 * Actor("Alice", simgrid::s4u::Host::by_name("Jupiter"), worker);
61 * But some people prefer to encapsulate their actors in classes and
62 * objects to save the actor state in a cleanly dedicated location.
63 * The syntax is slightly more complicated, but not much.
66 * #include "s4u/actor.hpp"
68 * // Declare the class representing your actors
71 * void operator()() { // Two pairs of () because this defines the method called ()
72 * printf("Hello s4u");
73 * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
77 * // From your main or from another actor, create your actor. Note the () after Worker
78 * Actor("Bob", simgrid::s4u::Host::by_name("Jupiter"), Worker());
81 * @section s4u_actor_flesh Fleshing your actor
83 * The body of your actor can use the functions of the
84 * simgrid::s4u::this_actor namespace to interact with the world.
85 * This namespace contains the methods to start new activities
86 * (executions, communications, etc), and to get informations about
87 * the currently running thread (its location, etc).
89 * Please refer to the @link simgrid::s4u::this_actor full API @endlink.
92 * @section s4u_actor_deploy Using a deployment file
94 * @warning This is currently not working with S4U. Sorry about that.
96 * The best practice is to use an external deployment file as
97 * follows, because it makes it easier to test your application in
98 * differing settings. Load this file with
99 * s4u::Engine::loadDeployment() before the simulation starts.
100 * Refer to the @ref deployment section for more information.
103 * <?xml version='1.0'?>
104 * <!DOCTYPE platform SYSTEM "http://simgrid.gforge.inria.fr/simgrid/simgrid.dtd">
105 * <platform version="4">
107 * <!-- Start a process called 'master' on the host called 'Tremblay' -->
108 * <process host="Tremblay" function="master">
109 * <!-- Here come the parameter that you want to feed to this instance of master -->
110 * <argument value="20"/> <!-- argv[1] -->
111 * <argument value="50000000"/> <!-- argv[2] -->
112 * <argument value="1000000"/> <!-- argv[3] -->
113 * <argument value="5"/> <!-- argv[4] -->
116 * <!-- Start a process called 'worker' on the host called 'Jupiter' -->
117 * <process host="Jupiter" function="worker"/> <!-- Don't provide any parameter ->>
125 /** @brief Simulation Agent (see \ref s4u_actor)*/
126 XBT_PUBLIC_CLASS Actor {
128 /** Wrap a (possibly non-copyable) single-use task into a `std::function` */
129 template<class F, class... Args>
132 Task(F&& code, Args&&... args) :
133 code_(std::forward<F>(code)),
134 args_(std::forward<Args>(args)...)
138 if (done_.test_and_set())
139 throw std::logic_error("Actor task already executed");
140 simgrid::xbt::apply(std::move(code_), std::move(args_));
143 std::atomic_flag done_ = ATOMIC_FLAG_INIT;
145 std::tuple<Args...> args_;
147 /** Wrap a (possibly non-copyable) single-use task into a `std::function` */
148 template<class F, class... Args>
149 static std::function<void()> wrap_task(F f, Args... args)
151 std::shared_ptr<Task<F, Args...>> task(
152 new Task<F, Args...>(std::move(f), std::move(args)...));
158 Actor() : pimpl_(nullptr) {}
159 Actor(smx_process_t smx_proc) :
160 pimpl_(SIMIX_process_ref(smx_proc)) {}
163 SIMIX_process_unref(pimpl_);
166 // Copy+move (with the copy-and-swap idiom):
167 Actor(Actor const& actor) : pimpl_(SIMIX_process_ref(actor.pimpl_)) {}
168 friend void swap(Actor& first, Actor& second)
171 swap(first.pimpl_, second.pimpl_);
173 Actor& operator=(Actor actor)
178 Actor(Actor&& actor) : pimpl_(nullptr)
183 /** Create an actor using a function
185 * If the actor is restarted, the actor has a fresh copy of the function.
187 Actor(const char* name, s4u::Host *host, double killTime, std::function<void()> code);
189 Actor(const char* name, s4u::Host *host, std::function<void()> code)
190 : Actor(name, host, -1.0d, std::move(code)) {};
192 /** Create an actor using code
194 * Using this constructor, move-only type can be used. The consequence is
195 * that we cannot copy the value and restart the process in its initial
196 * state. In order to use auto-restart, an explicit `function` must be passed
199 template<class F, class... Args,
200 // This constructor is enabled only if the call code(args...) is valid:
201 typename = typename std::result_of<F(Args...)>::type
203 Actor(const char* name, s4u::Host *host, F code, Args... args) :
204 Actor(name, host, wrap_task(std::move(code), std::move(args)...))
207 /** Retrieves the actor that have the given PID (or NULL if not existing) */
208 //static Actor *byPid(int pid); not implemented
210 /** Retrieves the name of that actor */
211 const char* getName();
212 /** Retrieves the host on which that actor is running */
213 s4u::Host *getHost();
214 /** Retrieves the PID of that actor */
217 /** If set to true, the actor will automatically restart when its host reboots */
218 void setAutoRestart(bool autorestart);
219 /** Sets the time at which that actor should be killed */
220 void setKillTime(double time);
221 /** Retrieves the time at which that actor will be killed (or -1 if not set) */
222 double getKillTime();
224 /** Ask the actor to die.
226 * It will only notice your request when doing a simcall next time (a communication or similar).
227 * SimGrid sometimes have issues when you kill actors that are currently communicating and such. We are working on it to fix the issues.
231 static void kill(int pid);
234 * Wait for the actor to finish.
238 // Static methods on all actors:
240 /** Ask kindly to all actors to die. Only the issuer will survive. */
241 static void killAll();
244 smx_process_t pimpl_ = nullptr;
248 * @brief Static methods working on the current actor (see @ref s4u::Actor) */
249 namespace this_actor {
251 /** Block the actor sleeping for that amount of seconds (may throws hostFailure) */
252 XBT_PUBLIC(void) sleep(double duration);
254 /** Block the actor, computing the given amount of flops */
255 XBT_PUBLIC(e_smx_state_t) execute(double flop);
257 /** Block the actor until it gets a message from the given mailbox.
259 * See \ref Comm for the full communication API (including non blocking communications).
261 XBT_PUBLIC(void*) recv(Mailbox &chan);
263 /** Block the actor until it delivers a message of the given simulated size to the given mailbox
265 * See \ref Comm for the full communication API (including non blocking communications).
267 XBT_PUBLIC(void) send(Mailbox &chan, void*payload, size_t simulatedSize);
273 }} // namespace simgrid::s4u
276 #endif /* SIMGRID_S4U_ACTOR_HPP */