Implement I/O as asynchronous activities

[simgrid.git] / include / simgrid / s4u / Activity.hpp

diff --git a/include/simgrid/s4u/Activity.hpp b/include/simgrid/s4u/Activity.hpp
index 38781d5..615f7bb 100644 (file)
--- a/include/simgrid/s4u/Activity.hpp
+++ b/include/simgrid/s4u/Activity.hpp
@@ -6,7 +6,6 @@
 #ifndef SIMGRID_S4U_ACTIVITY_HPP
 #define SIMGRID_S4U_ACTIVITY_HPP
 
-#include <simgrid/s4u/forward.hpp>
 #include <simgrid/forward.h>
 
 namespace simgrid {
@@ -15,7 +14,17 @@ namespace s4u {
 /** @brief Activities
  *
  * This class is the ancestor of every activities that an actor can undertake.
- * That is, of the actions that do take time in the simulated world.
+ * That is, activities are all the things that do take time to the actor in the simulated world.
+ *
+ * They are somewhat linked but not identical to simgrid::kernel::resource::Action,
+ * that are stuff occurring on a resource:
+ *
+ * - A sequential execution activity encompasses 2 actions: one for the exec itself,
+ *   and a time-limited sleep used as timeout detector.
+ * - A point-to-point communication activity encompasses 3 actions: one for the comm itself
+ *   (which spans on all links of the path), and one infinite sleep used as failure detector
+ *   on both sender and receiver hosts.
+ * - Synchronization activities may possibly be connected to no action.
  */
 class XBT_PUBLIC Activity {
   friend Comm;
@@ -24,6 +33,9 @@ class XBT_PUBLIC Activity {
   friend Exec;
   friend XBT_PUBLIC void intrusive_ptr_release(Exec * e);
   friend XBT_PUBLIC void intrusive_ptr_add_ref(Exec * e);
+  friend Io;
+  friend XBT_PUBLIC void intrusive_ptr_release(Io* i);
+  friend XBT_PUBLIC void intrusive_ptr_add_ref(Io* i);
 
 protected:
   Activity()  = default;
@@ -33,7 +45,7 @@ public:
   Activity(Activity const&) = delete;
   Activity& operator=(Activity const&) = delete;
 
-  enum class State { inited = 0, started, canceled, errored, finished };
+  enum class State { INITED = 0, STARTED, CANCELED, ERRORED, FINISHED };
 
   /** Starts a previously created activity.
    *
@@ -48,7 +60,7 @@ public:
    *  Raises: timeout exception.*/
   virtual Activity* wait(double timeout) = 0;
   /** Cancel that activity */
-  //virtual void cancel();
+  virtual Activity* cancel() = 0;
   /** Retrieve the current state of the activity */
   Activity::State get_state() { return state_; }
 
@@ -69,22 +81,27 @@ public:
   /** Retrieve the user data of the Activity */
   void* get_user_data() { return user_data_; }
 
+  /** @deprecated See Activity::get_state()*/
   XBT_ATTRIB_DEPRECATED_v323("Please use Activity::get_state()") Activity::State getState() { return state_; }
+  /** @deprecated See Activity::get_remaining() */
   XBT_ATTRIB_DEPRECATED_v323("Please use Activity::get_remaining()") double getRemains() { return get_remaining(); }
+  /** @deprecated See Activity::set_remaining() */
   XBT_ATTRIB_DEPRECATED_v323("Please use Activity::set_remaining()") Activity* setRemains(double remains)
   {
     return set_remaining(remains);
   }
+  /** @deprecated See Activity::set_user_data() */
   XBT_ATTRIB_DEPRECATED_v323("Please use Activity::set_user_data()") Activity* setUserData(void* data)
   {
     return set_user_data(data);
   }
+  /** @deprecated See Activity::get_user_data() */
   XBT_ATTRIB_DEPRECATED_v323("Please use Activity::get_user_data()") void* getUserData() { return user_data_; }
 
 private:
   simgrid::kernel::activity::ActivityImplPtr pimpl_ = nullptr;
-  Activity::State state_                            = Activity::State::inited;
-  double remains_ = 0;
+  Activity::State state_                            = Activity::State::INITED;
+  double remains_                                   = 0;
   void* user_data_                                  = nullptr;
 }; // class