-/* Copyright (c) 2006-2015. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2006-2016. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#ifndef SIMGRID_S4U_ACTOR_HPP
#define SIMGRID_S4U_ACTOR_HPP
+#include <atomic>
+#include <functional>
+#include <memory>
+#include <stdexcept>
+#include <type_traits>
+
#include <xbt/base.h>
+#include <xbt/functional.hpp>
+
#include <simgrid/simix.h>
#include <simgrid/s4u/forward.hpp>
namespace simgrid {
namespace s4u {
-/** @brief Simulation Agent
- *
- * An actor may be defined as a code executing in a location (host).
- *
- * All actors should be started from the XML deployment file (using the @link{s4u::Engine::loadDeployment()}),
- * even if you can also start new actors directly.
- * Separating the deployment in the XML from the logic in the code is a good habit as it makes your simulation easier
- * to adapt to new settings.
+/** @ingroup s4u_api
+ *
+ * An actor is an independent stream of execution in your distributed application.
*
- * The code that you define for a given actor should be placed in the main method that is virtual.
- * For example, a Worker actor should be declared as follows:
- *
- * \verbatim
+ * You can think of an actor as a process in your distributed application, or as a thread in a multithreaded program.
+ * This is the only component in SimGrid that actually does something on its own, executing its own code.
+ * 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.
+ *
+ * An actor is located on a (simulated) host, but it can interact
+ * with the whole simulated platform.
+ *
+ * The s4u::Actor API is strongly inspired from the C++11 threads.
+ * The <a href="http://en.cppreference.com/w/cpp/thread">documentation
+ * of this standard</a> may help to understand the philosophy of the S4U
+ * Actors.
+ *
+ * @section s4u_actor_def Defining the skeleton of an Actor
+ *
+ * %As in the <a href="http://en.cppreference.com/w/cpp/thread">C++11
+ * standard</a>, you can declare the code of your actor either as a
+ * pure function or as an object. It is very simple with functions:
+ *
+ * @code{.cpp}
* #include "s4u/actor.hpp"
- *
- * class Worker : simgrid::s4u::Actor {
- *
- * int main(int argc, char **argv) {
- * printf("Hello s4u");
- * }
+ *
+ * // Declare the code of your worker
+ * void worker() {
+ * printf("Hello s4u");
+ * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
* };
- * \endverbatim
+ *
+ * // From your main or from another actor, create your actor on the host Jupiter
+ * // The following line actually creates a new actor, even if there is no "new".
+ * Actor("Alice", simgrid::s4u::Host::by_name("Jupiter"), worker);
+ * @endcode
+ *
+ * But some people prefer to encapsulate their actors in classes and
+ * objects to save the actor state in a cleanly dedicated location.
+ * The syntax is slightly more complicated, but not much.
+ *
+ * @code{.cpp}
+ * #include "s4u/actor.hpp"
+ *
+ * // Declare the class representing your actors
+ * class Worker {
+ * public:
+ * void operator()() { // Two pairs of () because this defines the method called ()
+ * printf("Hello s4u");
+ * simgrid::s4u::this_actor::execute(5*1024*1024); // Get the worker executing a task of 5 MFlops
+ * }
+ * };
+ *
+ * // From your main or from another actor, create your actor. Note the () after Worker
+ * Actor("Bob", simgrid::s4u::Host::by_name("Jupiter"), Worker());
+ * @endcode
+ *
+ * @section s4u_actor_flesh Fleshing your actor
+ *
+ * The body of your actor can use the functions of the
+ * simgrid::s4u::this_actor namespace to interact with the world.
+ * This namespace contains the methods to start new activities
+ * (executions, communications, etc), and to get informations about
+ * the currently running thread (its location, etc).
+ *
+ * Please refer to the @link simgrid::s4u::this_actor full API @endlink.
*
+ *
+ * @section s4u_actor_deploy Using a deployment file
+ *
+ * @warning This is currently not working with S4U. Sorry about that.
+ *
+ * The best practice is to use an external deployment file as
+ * follows, because it makes it easier to test your application in
+ * differing settings. Load this file with
+ * s4u::Engine::loadDeployment() before the simulation starts.
+ * Refer to the @ref deployment section for more information.
+ *
+ * @code{.xml}
+ * <?xml version='1.0'?>
+ * <!DOCTYPE platform SYSTEM "http://simgrid.gforge.inria.fr/simgrid/simgrid.dtd">
+ * <platform version="4">
+ *
+ * <!-- Start a process called 'master' on the host called 'Tremblay' -->
+ * <process host="Tremblay" function="master">
+ * <!-- Here come the parameter that you want to feed to this instance of master -->
+ * <argument value="20"/> <!-- argv[1] -->
+ * <argument value="50000000"/> <!-- argv[2] -->
+ * <argument value="1000000"/> <!-- argv[3] -->
+ * <argument value="5"/> <!-- argv[4] -->
+ * </process>
+ *
+ * <!-- Start a process called 'worker' on the host called 'Jupiter' -->
+ * <process host="Jupiter" function="worker"/> <!-- Don't provide any parameter ->>
+ *
+ * </platform>
+ * @endcode
+ *
+ * @{
*/
+
+/** @brief Simulation Agent (see \ref s4u_actor)*/
XBT_PUBLIC_CLASS Actor {
- friend Comm;
- Actor(smx_process_t smx_proc);
+private:
+ /** Wrap a (possibly non-copyable) single-use task into a `std::function` */
+ template<class F, class... Args>
+ class Task {
+ public:
+ Task(F&& code, Args&&... args) :
+ code_(std::forward<F>(code)),
+ args_(std::forward<Args>(args)...)
+ {
+ done_.clear();
+ }
+ void operator()()
+ {
+ if (done_.test_and_set())
+ throw std::logic_error("Actor task already executed");
+ simgrid::xbt::apply(std::move(code_), std::move(args_));
+ }
+ private:
+ std::atomic_flag done_;
+ F code_;
+ std::tuple<Args...> args_;
+ };
+ /** Wrap a (possibly non-copyable) single-use task into a `std::function` */
+ template<class F, class... Args>
+ static std::function<void()> wrap_task(F f, Args... args)
+ {
+ std::shared_ptr<Task<F, Args...>> task(
+ new Task<F, Args...>(std::move(f), std::move(args)...));
+ return [=] {
+ (*task)();
+ };
+ }
public:
- Actor(const char*name, s4u::Host *host, int argc, char **argv);
- Actor(const char*name, s4u::Host *host, int argc, char **argv, double killTime);
- virtual ~Actor() {}
+ Actor() : pimpl_(nullptr) {}
+ Actor(smx_process_t smx_proc) :
+ pimpl_(SIMIX_process_ref(smx_proc)) {}
+ ~Actor()
+ {
+ SIMIX_process_unref(pimpl_);
+ }
+
+ // Copy+move (with the copy-and-swap idiom):
+ Actor(Actor const& actor) : pimpl_(SIMIX_process_ref(actor.pimpl_)) {}
+ friend void swap(Actor& first, Actor& second)
+ {
+ using std::swap;
+ swap(first.pimpl_, second.pimpl_);
+ }
+ Actor& operator=(Actor actor)
+ {
+ swap(*this, actor);
+ return *this;
+ }
+ Actor(Actor&& actor) : pimpl_(nullptr)
+ {
+ swap(*this, actor);
+ }
+
+ /** Create an actor using a function
+ *
+ * If the actor is restarted, the actor has a fresh copy of the function.
+ */
+ Actor(const char* name, s4u::Host *host, double killTime, std::function<void()> code);
+
+ Actor(const char* name, s4u::Host *host, std::function<void()> code)
+ : Actor(name, host, -1.0, std::move(code)) {};
+
+ /** Create an actor using code
+ *
+ * Using this constructor, move-only type can be used. The consequence is
+ * that we cannot copy the value and restart the process in its initial
+ * state. In order to use auto-restart, an explicit `function` must be passed
+ * instead.
+ */
+ template<class F, class... Args,
+ // This constructor is enabled only if the call code(args...) is valid:
+ typename = typename std::result_of<F(Args...)>::type
+ >
+ Actor(const char* name, s4u::Host *host, F code, Args... args) :
+ Actor(name, host, wrap_task(std::move(code), std::move(args)...))
+ {}
+
+ // Create actor from function name:
+
+ Actor(const char* name, s4u::Host *host, double killTime,
+ const char* function, std::vector<std::string> args);
- /** The main method of your agent */
- virtual int main(int argc, char **argv);
+ Actor(const char* name, s4u::Host *host, const char* function,
+ std::vector<std::string> args)
+ : Actor(name, host, -1.0, function, std::move(args)) {}
- /** The Actor that is currently running */
- static Actor &self();
/** Retrieves the actor that have the given PID (or NULL if not existing) */
//static Actor *byPid(int pid); not implemented
/** Retrieves the name of that actor */
- const char*getName();
+ const char* getName();
/** Retrieves the host on which that actor is running */
s4u::Host *getHost();
/** Retrieves the PID of that actor */
/** Retrieves the time at which that actor will be killed (or -1 if not set) */
double getKillTime();
- /** Ask kindly to all actors to die. Only the issuer will survive. */
- static void killAll();
/** Ask the actor to die.
*
* It will only notice your request when doing a simcall next time (a communication or similar).
*/
void kill();
+ static void kill(int pid);
+ static Actor forPid(int pid);
+
+ /**
+ * Wait for the actor to finish.
+ */
+ void join();
+
+ // Static methods on all actors:
+
+ /** Ask kindly to all actors to die. Only the issuer will survive. */
+ static void killAll();
+
+ bool valid() const { return pimpl_ != nullptr; }
+
+private:
+ smx_process_t pimpl_ = nullptr;
+};
+
+/** @ingroup s4u_api
+ * @brief Static methods working on the current actor (see @ref s4u::Actor) */
+namespace this_actor {
+
/** Block the actor sleeping for that amount of seconds (may throws hostFailure) */
- void sleep(double duration);
+ XBT_PUBLIC(void) sleep(double duration);
/** Block the actor, computing the given amount of flops */
- e_smx_state_t execute(double flop);
+ XBT_PUBLIC(e_smx_state_t) execute(double flop);
/** Block the actor until it gets a message from the given mailbox.
*
* See \ref Comm for the full communication API (including non blocking communications).
*/
- void *recv(Mailbox &chan);
+ XBT_PUBLIC(void*) recv(Mailbox &chan);
/** Block the actor until it delivers a message of the given simulated size to the given mailbox
*
* See \ref Comm for the full communication API (including non blocking communications).
*/
- void send(Mailbox &chan, void*payload, size_t simulatedSize);
-
-protected:
- smx_process_t getInferior() {return pimpl_;}
-private:
- smx_process_t pimpl_;
-};
-}} // namespace simgrid::s4u
-
-#endif /* SIMGRID_S4U_ACTOR_HPP */
-
-#if 0
-
-public abstract class Actor implements Runnable {
- /** Suspends the process. See {@link #resume()} to resume it afterward */
- public native void suspend();
- /** Resume a process that was suspended by {@link #suspend()}. */
- public native void resume();
- /** Tests if a process is suspended. */
- public native boolean isSuspended();
+ XBT_PUBLIC(void) send(Mailbox &chan, void*payload, size_t simulatedSize);
/**
- * Returns the value of a given process property.
+ * Return the PID of the current actor.
*/
- public native String getProperty(String name);
+ XBT_PUBLIC(int) getPid();
+};
- /**
- * Migrates a process to another host.
- *
- * @param host The host where to migrate the process.
- *
- */
- public native void migrate(Host host);
+/** @} */
+
+}} // namespace simgrid::s4u
- public native void exit();
- /**
- * This static method returns the current amount of processes running
- *
- * @return The count of the running processes
- */
- public native static int getCount();
-}
-#endif
+#endif /* SIMGRID_S4U_ACTOR_HPP */
