1 /* Copyright (c) 2006-2022. 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
9 #include <simgrid/forward.h>
11 #include <simgrid/chrono.hpp>
12 #include <xbt/Extendable.hpp>
13 #include <xbt/signal.hpp>
14 #include <xbt/string.hpp>
17 #include <unordered_map>
21 extern template class XBT_PUBLIC xbt::Extendable<s4u::Actor>;
26 * @brief Static methods working on the current actor (see @ref s4u::Actor) */
27 namespace this_actor {
29 XBT_PUBLIC bool is_maestro();
31 /** Block the current actor sleeping for that amount of seconds */
32 XBT_PUBLIC void sleep_for(double duration);
33 /** Block the current actor sleeping until the specified timestamp */
34 XBT_PUBLIC void sleep_until(double wakeup_time);
36 template <class Rep, class Period> inline void sleep_for(std::chrono::duration<Rep, Period> duration)
38 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
39 this_actor::sleep_for(seconds.count());
42 template <class Duration> inline void sleep_until(const SimulationTimePoint<Duration>& wakeup_time)
44 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(wakeup_time);
45 this_actor::sleep_until(timeout_native.time_since_epoch().count());
48 /** Block the current actor, computing the given amount of flops */
49 XBT_PUBLIC void execute(double flop);
51 /** Block the current actor, computing the given amount of flops at the given priority.
52 * An execution of priority 2 computes twice as fast as an execution at priority 1. */
53 XBT_PUBLIC void execute(double flop, double priority);
56 * @example examples/cpp/exec-ptask/s4u-exec-ptask.cpp
59 /** Block the current actor until the built parallel execution terminates
62 * .. _API_s4u_parallel_execute:
64 * **Example of use:** `examples/cpp/exec-ptask/s4u-exec-ptask.cpp
65 * <https://framagit.org/simgrid/simgrid/tree/master/examples/cpp/exec-ptask/s4u-exec-ptask.cpp>`_
67 * Parallel executions convenient abstractions of parallel computational kernels that span over several machines,
68 * such as a PDGEM and the other ScaLAPACK routines. If you are interested in the effects of such parallel kernel
69 * on the platform (e.g. to schedule them wisely), there is no need to model them in all details of their internal
70 * execution and communications. It is much more convenient to model them as a single execution activity that spans
71 * over several hosts. This is exactly what s4u's Parallel Executions are.
73 * To build such an object, you need to provide a list of hosts that are involved in the parallel kernel (the
74 * actor's own host may or may not be in this list) and specify the amount of computations that should be done by
75 * each host, using a vector of flops amount. Then, you should specify the amount of data exchanged between each
76 * hosts during the parallel kernel. For that, a matrix of values is expected.
78 * It is OK to build a parallel execution without any computation and/or without any communication.
79 * Just pass an empty vector to the corresponding parameter.
81 * For example, if your list of hosts is ``[host0, host1]``, passing a vector ``[1000, 2000]`` as a `flops_amount`
82 * vector means that `host0` should compute 1000 flops while `host1` will compute 2000 flops. A matrix of
83 * communications' sizes of ``[0, 1, 2, 3]`` specifies the following data exchanges:
85 * - from host0: [ to host0: 0 bytes; to host1: 1 byte ]
87 * - from host1: [ to host0: 2 bytes; to host1: 3 bytes ]
91 * - From host0 to host0: 0 bytes are exchanged
93 * - From host0 to host1: 1 byte is exchanged
95 * - From host1 to host0: 2 bytes are exchanged
97 * - From host1 to host1: 3 bytes are exchanged
99 * In a parallel execution, all parts (all executions on each hosts, all communications) progress exactly at the
100 * same pace, so they all terminate at the exact same pace. If one part is slow because of a slow resource or
101 * because of contention, this slows down the parallel execution as a whole.
103 * These objects are somewhat surprising from a modeling point of view. For example, the unit of their speed is
104 * somewhere between flop/sec and byte/sec. Arbitrary parallel executions will simply not work with the usual platform
105 * models, and you must :ref:`use the ptask_L07 host model <options_model_select>` for that. Note that you can mix
106 * regular executions and communications with parallel executions, provided that the host model is ptask_L07.
110 /** Block the current actor until the built parallel execution completes */
111 XBT_PUBLIC void parallel_execute(const std::vector<s4u::Host*>& hosts, const std::vector<double>& flops_amounts,
112 const std::vector<double>& bytes_amounts);
114 /** Initialize a sequential execution that must then be started manually */
115 XBT_PUBLIC ExecPtr exec_init(double flops_amounts);
116 /** Initialize a parallel execution that must then be started manually */
117 XBT_PUBLIC ExecPtr exec_init(const std::vector<s4u::Host*>& hosts, const std::vector<double>& flops_amounts,
118 const std::vector<double>& bytes_amounts);
120 XBT_PUBLIC ExecPtr exec_async(double flops_amounts);
122 /** @brief Returns the actor ID of the current actor. */
123 XBT_PUBLIC aid_t get_pid();
125 /** @brief Returns the ancestor's actor ID of the current actor. */
126 XBT_PUBLIC aid_t get_ppid();
128 /** @brief Returns the name of the current actor. */
129 XBT_PUBLIC std::string get_name();
130 /** @brief Returns the name of the current actor as a C string. */
131 XBT_PUBLIC const char* get_cname();
133 /** @brief Returns the name of the host on which the current actor is running. */
134 XBT_PUBLIC Host* get_host();
136 /** @brief Suspend the current actor, that is blocked until resume()ed by another actor. */
137 XBT_PUBLIC void suspend();
139 /** @brief Yield the current actor. */
140 XBT_PUBLIC void yield();
142 /** @brief kill the current actor. */
143 XBT_ATTRIB_NORETURN XBT_PUBLIC void exit();
145 /** @brief Add a function to the list of "on_exit" functions of the current actor.
147 * The on_exit functions are the functions executed when your actor is killed. You should use them to free the data used
150 * Please note that functions registered in this signal cannot do any simcall themselves. It means that they cannot
151 * send or receive messages, acquire or release mutexes, nor even modify a host property or something. Not only are
152 * blocking functions forbidden in this setting, but also modifications to the global state.
154 * The parameter of on_exit's callbacks denotes whether or not the actor's execution failed.
155 * It will be set to true if the actor was killed or failed because of an exception or if the simulation deadlocked,
156 * while it will remain to false if the actor terminated gracefully.
159 XBT_PUBLIC void on_exit(const std::function<void(bool)>& fun);
161 /** @brief Migrate the current actor to a new host. */
162 XBT_PUBLIC void set_host(Host* new_host);
163 } // namespace this_actor
165 /** An actor is an independent stream of execution in your distributed application.
168 * It is located on a (simulated) :cpp:class:`host <simgrid::s4u::Host>`, but can interact
169 * with the whole simulated platform.
171 * You can think of an actor as a process in your distributed application, or as a thread in a multithreaded program.
172 * This is the only component in SimGrid that actually does something on its own, executing its own code.
173 * A resource will not get used if you don't schedule activities on them. This is the code of Actors that create and
174 * schedule these activities. **Please refer to the** :ref:`examples <s4u_ex_actors>` **for more information.**
176 * This API is strongly inspired from the C++11 threads.
177 * The `documentation of this standard <http://en.cppreference.com/w/cpp/thread>`_
178 * may help to understand the philosophy of the SimGrid actors.
182 class XBT_PUBLIC Actor : public xbt::Extendable<Actor> {
186 friend kernel::actor::ActorImpl;
187 friend kernel::activity::MailboxImpl;
188 friend void this_actor::sleep_for(double);
189 friend void this_actor::suspend();
191 kernel::actor::ActorImpl* const pimpl_;
194 explicit Actor(kernel::actor::ActorImpl* pimpl) : pimpl_(pimpl) {}
198 // ***** No copy *****
199 Actor(Actor const&) = delete;
200 Actor& operator=(Actor const&) = delete;
202 // ***** Reference count *****
203 friend XBT_PUBLIC void intrusive_ptr_add_ref(const Actor* actor);
204 friend XBT_PUBLIC void intrusive_ptr_release(const Actor* actor);
206 /** Retrieve the amount of references on that object. Useful to debug the automatic refcounting */
207 int get_refcount() const;
209 // ***** Actor creation *****
210 /** Retrieve a reference to myself */
211 static Actor* self();
214 static xbt::signal<void(Actor&)> on_creation;
215 static xbt::signal<void(Actor const&)> on_suspend;
216 static xbt::signal<void(Actor const&)> on_resume;
217 static xbt::signal<void(Actor const&)> on_sleep;
218 static xbt::signal<void(Actor const&)> on_wake_up;
219 static xbt::signal<void(const Actor&, const Host& previous_location)> on_host_change;
220 static xbt::signal<void(Actor const&)> on_termination;
221 static xbt::signal<void(Actor const&)> on_destruction;
224 /** Add a callback fired when a new actor has been created **/
225 static void on_creation_cb(const std::function<void(Actor&)>& cb) { on_creation.connect(cb); }
226 /** Add a callback fired when an actor has been suspended**/
227 static void on_suspend_cb(const std::function<void(Actor const&)>& cb) { on_suspend.connect(cb); }
228 /** Add a callback fired when an actor has been resumed **/
229 static void on_resume_cb(const std::function<void(Actor const&)>& cb) { on_resume.connect(cb); }
230 /** Add a callback fired when an actor starts sleeping **/
231 static void on_sleep_cb(const std::function<void(Actor const&)>& cb) { on_sleep.connect(cb); }
232 /** Add a callback fired when an actor wakes up from a sleep **/
233 static void on_wake_up_cb(const std::function<void(Actor const&)>& cb) { on_wake_up.connect(cb); }
234 /** Add a callback fired when an actor is has been migrated to another host **/
235 static void on_host_change_cb(const std::function<void(const Actor&, const Host& previous_location)>& cb)
237 on_host_change.connect(cb);
240 /** Add a callback fired when an actor terminates its code.
242 * The actor may continue to exist if it is still referenced in the simulation, but it's not active anymore.
243 * If you want to free extra data when the actor's destructor is called, use :cpp:var:`Actor::on_destruction`.
244 * If you want to register to the termination of a given actor, use :cpp:func:`this_actor::on_exit()` instead.
247 static void on_termination_cb(const std::function<void(Actor const&)>& cb) { on_termination.connect(cb); }
248 /** Add a callback fired when an actor is about to disappear (its destructor was called).
249 * This signal is fired for any destructed actor, which is mostly useful when designing plugins and extensions.
250 * If you want to react to the end of the actor's code, use Actor::on_termination instead.
251 * If you want to register to the termination of a given actor, use this_actor::on_exit() instead.*/
252 static void on_destruction_cb(const std::function<void(Actor const&)>& cb) { on_destruction.connect(cb); }
254 /** Create an actor from a std::function<void()>.
255 * If the actor is restarted, it gets a fresh copy of the function. */
256 static ActorPtr create(const std::string& name, s4u::Host* host, const std::function<void()>& code);
257 /** Create an actor, but don't start it yet.
259 * This is useful to set some properties or extension before actually starting it */
260 static ActorPtr init(const std::string& name, s4u::Host* host);
261 ActorPtr set_stacksize(unsigned stacksize);
262 /** Start a previously initialized actor */
263 ActorPtr start(const std::function<void()>& code);
265 template <class F> ActorPtr start(F code) { return start(std::function<void()>(std::move(code))); }
267 template <class F, class... Args,
268 // This constructor is enabled only if the call code(args...) is valid:
269 #ifndef DOXYGEN /* breathe seem to choke on function signatures in template parameter, see breathe#611 */
270 typename = typename std::result_of_t<F(Args...)>
273 ActorPtr start(F code, Args... args)
275 return start(std::bind(std::move(code), std::move(args)...));
278 ActorPtr start(const std::function<void()>& code, std::vector<std::string> args);
280 /** Create an actor from a callable thing. */
281 template <class F> static ActorPtr create(const std::string& name, s4u::Host* host, F code)
283 return create(name, host, std::function<void()>(std::move(code)));
286 /** Create an actor using a callable thing and its arguments.
288 * Note that the arguments will be copied, so move-only parameters are forbidden */
290 template <class F, class... Args,
291 // This constructor is enabled only if the call code(args...) is valid:
292 #ifndef DOXYGEN /* breathe seem to choke on function signatures in template parameter, see breathe#611 */
293 typename = typename std::result_of_t<F(Args...)>
296 static ActorPtr create(const std::string& name, s4u::Host* host, F code, Args... args)
298 return create(name, host, std::bind(std::move(code), std::move(args)...));
301 /** Create actor from function name and a vector of strings as arguments. */
302 static ActorPtr create(const std::string& name, s4u::Host* host, const std::string& function,
303 std::vector<std::string> args);
305 // ***** Methods *****
306 /** This actor will be automatically terminated when the last non-daemon actor finishes **/
309 /** Returns whether or not this actor has been daemonized or not **/
310 bool is_daemon() const;
311 static bool is_maestro();
313 /** Retrieves the name of that actor as a C++ string */
314 const simgrid::xbt::string& get_name() const;
315 /** Retrieves the name of that actor as a C string */
316 const char* get_cname() const;
317 /** Retrieves the host on which that actor is running */
318 Host* get_host() const;
319 /** Retrieves the actor ID of that actor */
320 aid_t get_pid() const;
321 /** Retrieves the actor ID of that actor's creator */
322 aid_t get_ppid() const;
324 /** Suspend an actor, that is blocked until resumeed by another actor */
327 /** Resume an actor that was previously suspended */
330 /** Returns true if the actor is suspended. */
331 bool is_suspended() const;
333 /** If set to true, the actor will automatically restart when its host reboots */
334 void set_auto_restart(bool autorestart);
336 /** Add a function to the list of "on_exit" functions for the current actor. The on_exit functions are the functions
337 * executed when your actor is killed. You should use them to free the data used by your actor.
339 * Please note that functions registered in this signal cannot do any simcall themselves. It means that they cannot
340 * send or receive messages, acquire or release mutexes, nor even modify a host property or something. Not only are
341 * blocking functions forbidden in this setting, but also modifications to the global state.
343 * The parameter of on_exit's callbacks denotes whether or not the actor's execution failed.
344 * It will be set to true if the actor was killed or failed because of an exception,
345 * while it will remain to false if the actor terminated gracefully.
347 void on_exit(const std::function<void(bool /*failed*/)>& fun) const;
349 /** Sets the time at which that actor should be killed */
350 void set_kill_time(double time);
351 /** Retrieves the time at which that actor will be killed (or -1 if not set) */
352 double get_kill_time() const;
354 /** @brief Moves the actor to another host
356 * If the actor is currently blocked on an execution activity, the activity is also
357 * migrated to the new host. If it's blocked on another kind of activity, an error is
358 * raised as the mandated code is not written yet. Please report that bug if you need it.
360 * Asynchronous activities started by the actor are not migrated automatically, so you have
361 * to take care of this yourself (only you knows which ones should be migrated).
363 void set_host(Host* new_host);
365 /** Ask the actor to die.
367 * Any blocking activity will be canceled, and it will be rescheduled to free its memory.
368 * Being killed is not something that actors can defer or avoid.
372 /** Retrieves the actor that have the given PID (or nullptr if not existing) */
373 static ActorPtr by_pid(aid_t pid);
375 /** Wait for the actor to finish.
377 * Blocks the calling actor until the joined actor is terminated. If actor alice executes bob.join(), then alice is
378 * blocked until bob terminates.
382 /** Wait for the actor to finish, or for the timeout to elapse.
384 * Blocks the calling actor until the joined actor is terminated. If actor alice executes bob.join(), then alice is
385 * blocked until bob terminates.
387 void join(double timeout) const;
388 /** Kill that actor and restart it from start. */
391 /** Kill all actors (but the issuer). Being killed is not something that actors can delay or avoid. */
392 static void kill_all();
394 /** Returns the internal implementation of this actor */
395 kernel::actor::ActorImpl* get_impl() const { return pimpl_; }
397 /** Retrieve the list of properties for that actor */
398 const std::unordered_map<std::string, std::string>*
399 get_properties() const; // FIXME: do not export the map, but only the keys or something
401 /** Retrieve the property value (or nullptr if not set) */
402 const char* get_property(const std::string& key) const;
404 /** Set a property (old values will be overwritten) */
405 void set_property(const std::string& key, const std::string& value);
408 }} // namespace simgrid::s4u
411 #endif /* SIMGRID_S4U_ACTOR_HPP */