1 /* Copyright (c) 2006-2018. 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
15 #include <type_traits>
19 #include <xbt/Extendable.hpp>
20 #include <xbt/functional.hpp>
21 #include <xbt/string.hpp>
22 #include <xbt/signal.hpp>
24 #include <simgrid/chrono.hpp>
25 #include <simgrid/s4u/forward.hpp>
32 * An actor is an independent stream of execution in your distributed application.
34 * You can think of an actor as a process in your distributed application, or as a thread in a multithreaded program.
35 * This is the only component in SimGrid that actually does something on its own, executing its own code.
36 * A resource will not get used if you don't schedule activities on them. This is the code of Actors that create and
37 * schedule these activities.
39 * An actor is located on a (simulated) host, but it can interact
40 * with the whole simulated platform.
42 * The s4u::Actor API is strongly inspired from the C++11 threads.
43 * The <a href="http://en.cppreference.com/w/cpp/thread">documentation
44 * of this standard</a> may help to understand the philosophy of the S4U
47 * @section s4u_actor_def Defining the skeleton of an Actor
49 * As in the <a href="http://en.cppreference.com/w/cpp/thread">C++11
50 * standard</a>, you can declare the code of your actor either as a
51 * pure function or as an object. It is very simple with functions:
54 * #include <simgrid/s4u/actor.hpp>
56 * // Declare the code of your worker
58 * printf("Hello s4u");
59 * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
62 * // From your main or from another actor, create your actor on the host Jupiter
63 * // The following line actually creates a new actor, even if there is no "new".
64 * Actor("Alice", simgrid::s4u::Host::by_name("Jupiter"), worker);
67 * But some people prefer to encapsulate their actors in classes and
68 * objects to save the actor state in a cleanly dedicated location.
69 * The syntax is slightly more complicated, but not much.
72 * #include <simgrid/s4u/actor.hpp>
74 * // Declare the class representing your actors
77 * void operator()() { // Two pairs of () because this defines the method called ()
78 * printf("Hello s4u");
79 * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
83 * // From your main or from another actor, create your actor. Note the () after Worker
84 * Actor("Bob", simgrid::s4u::Host::by_name("Jupiter"), Worker());
87 * @section s4u_actor_flesh Fleshing your actor
89 * The body of your actor can use the functions of the
90 * simgrid::s4u::this_actor namespace to interact with the world.
91 * This namespace contains the methods to start new activities
92 * (executions, communications, etc), and to get informations about
93 * the currently running thread (its location, etc).
95 * Please refer to the @link simgrid::s4u::this_actor full API @endlink.
98 * @section s4u_actor_deploy Using a deployment file
100 * @warning This is currently not working with S4U. Sorry about that.
102 * The best practice is to use an external deployment file as
103 * follows, because it makes it easier to test your application in
104 * differing settings. Load this file with
105 * s4u::Engine::loadDeployment() before the simulation starts.
106 * Refer to the @ref deployment section for more information.
109 * <?xml version='1.0'?>
110 * <!DOCTYPE platform SYSTEM "http://simgrid.gforge.inria.fr/simgrid/simgrid.dtd">
111 * <platform version="4">
113 * <!-- Start an actor called 'master' on the host called 'Tremblay' -->
114 * <actor host="Tremblay" function="master">
115 * <!-- Here come the parameter that you want to feed to this instance of master -->
116 * <argument value="20"/> <!-- argv[1] -->
117 * <argument value="50000000"/> <!-- argv[2] -->
118 * <argument value="1000000"/> <!-- argv[3] -->
119 * <argument value="5"/> <!-- argv[4] -->
122 * <!-- Start an actor called 'worker' on the host called 'Jupiter' -->
123 * <actor host="Jupiter" function="worker"/> <!-- Don't provide any parameter ->>
131 /** @brief Simulation Agent */
132 class XBT_PUBLIC Actor : public simgrid::xbt::Extendable<Actor> {
135 friend simgrid::kernel::actor::ActorImpl;
136 friend simgrid::kernel::activity::MailboxImpl;
137 kernel::actor::ActorImpl* pimpl_ = nullptr;
139 /** Wrap a (possibly non-copyable) single-use task into a `std::function` */
140 template<class F, class... Args>
141 static std::function<void()> wrap_task(F f, Args... args)
143 typedef decltype(f(std::move(args)...)) R;
144 auto task = std::make_shared<simgrid::xbt::Task<R()>>(
145 simgrid::xbt::makeTask(std::move(f), std::move(args)...));
146 return [task] { (*task)(); };
149 explicit Actor(smx_actor_t pimpl) : pimpl_(pimpl) {}
153 // ***** No copy *****
154 Actor(Actor const&) = delete;
155 Actor& operator=(Actor const&) = delete;
157 // ***** Reference count *****
158 friend XBT_PUBLIC void intrusive_ptr_add_ref(Actor * actor);
159 friend XBT_PUBLIC void intrusive_ptr_release(Actor * actor);
161 // ***** Actor creation *****
162 /** Retrieve a reference to myself */
163 static ActorPtr self();
165 /** Signal to others that a new actor has been created **/
166 static simgrid::xbt::signal<void(simgrid::s4u::ActorPtr)> onCreation;
167 /** Signal indicating that the given actor is about to disappear */
168 static simgrid::xbt::signal<void(simgrid::s4u::ActorPtr)> onDestruction;
170 /** Create an actor using a function
172 * If the actor is restarted, the actor has a fresh copy of the function.
174 static ActorPtr createActor(const char* name, s4u::Host* host, std::function<void()> code);
176 static ActorPtr createActor(const char* name, s4u::Host* host, std::function<void(std::vector<std::string>*)> code,
177 std::vector<std::string>* args)
179 return createActor(name, host, [code](std::vector<std::string>* args) { code(args); }, args);
182 /** Create an actor using code
184 * Using this constructor, move-only type can be used. The consequence is
185 * that we cannot copy the value and restart the actor in its initial
186 * state. In order to use auto-restart, an explicit `function` must be passed
189 template<class F, class... Args,
190 // This constructor is enabled only if the call code(args...) is valid:
191 typename = typename std::result_of<F(Args...)>::type
193 static ActorPtr createActor(const char* name, s4u::Host *host, F code, Args... args)
195 return createActor(name, host, wrap_task(std::move(code), std::move(args)...));
198 // Create actor from function name:
200 static ActorPtr createActor(const char* name, s4u::Host* host, const char* function, std::vector<std::string> args);
202 // ***** Methods *****
203 /** This actor will be automatically terminated when the last non-daemon actor finishes **/
206 /** Returns whether or not this actor has been daemonized or not **/
209 XBT_ATTRIB_DEPRECATED_v323("Please use Actor::get_name()") const simgrid::xbt::string& getName() const
213 XBT_ATTRIB_DEPRECATED_v323("Please use Actor::get_cname()") const char* getCname() const { return get_cname(); }
215 /** Retrieves the name of that actor as a C++ string */
216 const simgrid::xbt::string& get_name() const;
217 /** Retrieves the name of that actor as a C string */
218 const char* get_cname() const;
219 /** Retrieves the host on which that actor is running */
220 s4u::Host* getHost();
221 /** Retrieves the PID of that actor
223 * aid_t is an alias for long */
225 /** Retrieves the PPID of that actor
227 * aid_t is an alias for long */
230 /** Suspend an actor by suspending the task on which it was waiting for the completion. */
233 /** Resume a suspended actor by resuming the task on which it was waiting for the completion. */
238 /** Returns true if the actor is suspended. */
241 /** If set to true, the actor will automatically restart when its host reboots */
242 void setAutoRestart(bool autorestart);
244 /** Add a function to the list of "on_exit" functions for the current actor. The on_exit functions are the functions
245 * executed when your actor is killed. You should use them to free the data used by your actor.
247 void onExit(int_f_pvoid_pvoid_t fun, void* data);
249 /** Sets the time at which that actor should be killed */
250 void setKillTime(double time);
251 /** Retrieves the time at which that actor will be killed (or -1 if not set) */
252 double getKillTime();
254 void migrate(Host * new_host);
256 /** Ask the actor to die.
258 * Any blocking activity will be canceled, and it will be rescheduled to free its memory.
259 * Being killed is not something that actors can defer or avoid.
261 * SimGrid still have sometimes issues when you kill actors that are currently communicating and such.
262 * Still. Please report any bug that you may encounter with a minimal working example.
266 static void kill(aid_t pid);
268 /** Retrieves the actor that have the given PID (or nullptr if not existing) */
269 static ActorPtr byPid(aid_t pid);
271 /** @brief Wait for the actor to finish.
273 * This blocks the calling actor until the actor on which we call join() is terminated
276 void join(double timeout);
278 // Static methods on all actors:
280 /** Ask kindly to all actors to die. Only the issuer will survive. */
281 static void killAll();
282 static void killAll(int resetPid);
284 /** Returns the internal implementation of this actor */
285 kernel::actor::ActorImpl* getImpl();
287 /** Retrieve the property value (or nullptr if not set) */
288 std::map<std::string, std::string>* getProperties();
289 const char* getProperty(const char* key);
290 void setProperty(const char* key, const char* value);
295 * @brief Static methods working on the current actor (see @ref s4u::Actor) */
296 namespace this_actor {
298 XBT_PUBLIC bool isMaestro();
300 /** Block the actor sleeping for that amount of seconds (may throws hostFailure) */
301 XBT_PUBLIC void sleep_for(double duration);
302 XBT_PUBLIC void sleep_until(double timeout);
304 template <class Rep, class Period> inline void sleep_for(std::chrono::duration<Rep, Period> duration)
306 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
307 this_actor::sleep_for(seconds.count());
310 template <class Duration> inline void sleep_until(const SimulationTimePoint<Duration>& timeout_time)
312 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(timeout_time);
313 this_actor::sleep_until(timeout_native.time_since_epoch().count());
316 /** Block the actor, computing the given amount of flops */
317 XBT_PUBLIC void execute(double flop);
319 /** Block the actor, computing the given amount of flops at the given priority.
320 * An execution of priority 2 computes twice as fast as an execution at priority 1. */
321 XBT_PUBLIC void execute(double flop, double priority);
323 XBT_PUBLIC void parallel_execute(int host_nb, sg_host_t* host_list, double* flops_amount, double* bytes_amount);
324 XBT_PUBLIC void parallel_execute(int host_nb, sg_host_t* host_list, double* flops_amount, double* bytes_amount,
327 XBT_PUBLIC ExecPtr exec_init(double flops_amounts);
328 XBT_PUBLIC ExecPtr exec_async(double flops_amounts);
330 /** @brief Returns the actor ID of the current actor). */
331 XBT_PUBLIC aid_t getPid();
333 /** @brief Returns the ancestor's actor ID of the current actor. */
334 XBT_PUBLIC aid_t getPpid();
336 /** @brief Returns the name of the current actor. */
337 XBT_PUBLIC std::string get_name();
338 /** @brief Returns the name of the current actor as a C string. */
339 XBT_PUBLIC const char* get_cname();
341 XBT_ATTRIB_DEPRECATED_v323("Please use this_actor::get_name()") XBT_PUBLIC std::string getName();
342 XBT_ATTRIB_DEPRECATED_v323("Please use this_actor::get_cname()") XBT_PUBLIC const char* getCname();
344 /** @brief Returns the name of the host on which the actor is running. */
345 XBT_PUBLIC Host* getHost();
347 /** @brief Suspend the actor. */
348 XBT_PUBLIC void suspend();
350 /** @brief yield the actor. */
351 XBT_PUBLIC void yield();
353 /** @brief Resume the actor. */
354 XBT_PUBLIC void resume();
356 XBT_PUBLIC bool isSuspended();
358 /** @brief kill the actor. */
359 XBT_PUBLIC void kill();
361 /** @brief Add a function to the list of "on_exit" functions. */
362 XBT_PUBLIC void onExit(int_f_pvoid_pvoid_t fun, void* data);
364 /** @brief Migrate the actor to a new host. */
365 XBT_PUBLIC void migrate(Host* new_host);
370 }} // namespace simgrid::s4u
373 #endif /* SIMGRID_S4U_ACTOR_HPP */