X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/be3155e24d0c71e2bbd31dd282cfd49bff7290fa..1cce0801abcad7c884f9e72ceda87e36d6635104:/include/simgrid/s4u/actor.hpp

diff --git a/include/simgrid/s4u/actor.hpp b/include/simgrid/s4u/actor.hpp
index aa5877d5d1..4f3a1a9f5d 100644
--- a/include/simgrid/s4u/actor.hpp
+++ b/include/simgrid/s4u/actor.hpp
@@ -6,17 +6,22 @@
 #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 {
 
-/** @addtogroup s4u_actor
- * 
- * @tableofcontents
+/** @ingroup s4u_api
  * 
  * An actor is an independent stream of execution in your distributed application.
  *
@@ -32,8 +37,6 @@ namespace s4u {
  * of this standard</a> may help to understand the philosophy of the S4U
  * Actors. 
  * 
- * (back to the @ref s4u_api "S4U documentation")
- * 
  * @section s4u_actor_def Defining the skeleton of an Actor
  * 
  * %As in the <a href="http://en.cppreference.com/w/cpp/thread">C++11
@@ -41,6 +44,8 @@ namespace s4u {
  * pure function or as an object. It is very simple with functions:
  * 
  * @code{.cpp}
+ * #include "s4u/actor.hpp"
+ * 
  * // Declare the code of your worker
  * void worker() {
  *   printf("Hello s4u");
@@ -48,7 +53,8 @@ namespace s4u {
  * };
  * 
  * // From your main or from another actor, create your actor on the host Jupiter
- * Actor("worker", simgrid::s4u::Host::by_name("Jupiter"), worker);
+ * // 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
@@ -68,7 +74,7 @@ namespace s4u {
  * };
  * 
  * // From your main or from another actor, create your actor. Note the () after Worker
- * Actor("worker", simgrid::s4u::Host::by_name("Jupiter"), Worker());
+ * Actor("Bob", simgrid::s4u::Host::by_name("Jupiter"), Worker());
  * @endcode
  * 
  * @section s4u_actor_flesh Fleshing your actor
@@ -114,9 +120,41 @@ namespace s4u {
  * 
  *  @{
  */
-   
+
 /** @brief Simulation Agent (see \ref s4u_actor)*/
 XBT_PUBLIC_CLASS Actor {
+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() : pimpl_(nullptr) {}
   Actor(smx_process_t smx_proc) :
@@ -143,12 +181,38 @@ public:
     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, std::move(code)) {};
-  template<class C>
-  Actor(const char* name, s4u::Host *host, C code)
-    : Actor(name, host, -1, std::function<void()>(std::move(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);
+
+  Actor(const char* name, s4u::Host *host, const char* function,
+      std::vector<std::string> args)
+    : Actor(name, host, -1.0, function, std::move(args)) {}
 
   /** Retrieves the actor that have the given PID (or NULL if not existing) */
   //static Actor *byPid(int pid); not implemented
@@ -175,6 +239,7 @@ public:
   void kill();
 
   static void kill(int pid);
+  static Actor forPid(int pid);
   
   /**
    * Wait for the actor to finish.
@@ -186,11 +251,14 @@ public:
   /** 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;
 };
 
-/** @brief Static methods working on the current actor (see @ref s4u_actor) */
+/** @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) */
@@ -210,6 +278,11 @@ namespace this_actor {
    * See \ref Comm for the full communication API (including non blocking communications).
   */
   XBT_PUBLIC(void) send(Mailbox &chan, void*payload, size_t simulatedSize);
+  
+  /**
+   * Return the PID of the current actor.
+   */
+  XBT_PUBLIC(int) getPid();
 
 };