1 /* Copyright (c) 2006-2019. 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_ACTIVITY_HPP
7 #define SIMGRID_S4U_ACTIVITY_HPP
9 #include "xbt/asserts.h"
11 #include <simgrid/forward.h>
12 #include <xbt/signal.hpp>
19 * This class is the ancestor of every activities that an actor can undertake.
20 * That is, activities are all the things that do take time to the actor in the simulated world.
22 * They are somewhat linked but not identical to simgrid::kernel::resource::Action,
23 * that are stuff occurring on a resource:
25 * - A sequential execution activity encompasses 2 actions: one for the exec itself,
26 * and a time-limited sleep used as timeout detector.
27 * - A point-to-point communication activity encompasses 3 actions: one for the comm itself
28 * (which spans on all links of the path), and one infinite sleep used as failure detector
29 * on both sender and receiver hosts.
30 * - Synchronization activities may possibly be connected to no action.
32 class XBT_PUBLIC Activity {
34 friend XBT_PUBLIC void intrusive_ptr_release(Comm * c);
35 friend XBT_PUBLIC void intrusive_ptr_add_ref(Comm * c);
40 friend XBT_PUBLIC void intrusive_ptr_release(Exec * e);
41 friend XBT_PUBLIC void intrusive_ptr_add_ref(Exec * e);
44 friend XBT_PUBLIC void intrusive_ptr_release(Io* i);
45 friend XBT_PUBLIC void intrusive_ptr_add_ref(Io* i);
49 virtual ~Activity() = default;
53 Activity(Activity const&) = delete;
54 Activity& operator=(Activity const&) = delete;
57 enum class State { INITED = 0, STARTED, CANCELED, ERRORED, FINISHED };
59 /** Starts a previously created activity.
61 * This function is optional: you can call wait() even if you didn't call start()
63 virtual Activity* start() = 0;
64 /** Blocks until the activity is terminated */
65 virtual Activity* wait() = 0;
66 /** Blocks until the activity is terminated, or until the timeout is elapsed
67 * Raises: timeout exception.*/
68 virtual Activity* wait_for(double timeout) = 0;
69 /** Blocks until the activity is terminated, or until the time limit is reached
70 * Raises: timeout exception. */
71 void wait_until(double time_limit);
73 /** Cancel that activity */
74 virtual Activity* cancel() = 0;
75 /** Retrieve the current state of the activity */
76 Activity::State get_state() { return state_; }
77 /** Tests whether the given activity is terminated yet. This is a pure function. */
78 virtual bool test() = 0;
80 /** Get the remaining amount of work that this Activity entails. When it's 0, it's done. */
81 virtual double get_remaining();
83 /** Set the [remaining] amount of work that this Activity will entail
85 * It is forbidden to change the amount of work once the Activity is started */
86 Activity* set_remaining(double remains);
88 /** Put some user data onto the Activity */
90 kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
93 kernel::activity::ActivityImplPtr pimpl_ = nullptr;
94 Activity::State state_ = Activity::State::INITED;
98 template <class AnyActivity> class Activity_T : public Activity {
100 std::string name_ = "";
101 std::string tracing_category_ = "";
102 void* user_data_ = nullptr;
103 std::atomic_int_fast32_t refcount_{0};
107 friend XBT_PUBLIC void intrusive_ptr_release(AnyActivity* a)
109 if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
110 std::atomic_thread_fence(std::memory_order_acquire);
114 friend XBT_PUBLIC void intrusive_ptr_add_ref(AnyActivity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
116 AnyActivity* set_name(const std::string& name)
118 xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
120 return static_cast<AnyActivity*>(this);
122 const std::string& get_name() { return name_; }
123 const char* get_cname() { return name_.c_str(); }
125 AnyActivity* set_tracing_category(const std::string& category)
127 xbt_assert(get_state() == State::INITED, "Cannot change the tracing category of an activity after its start");
128 tracing_category_ = category;
129 return static_cast<AnyActivity*>(this);
131 const std::string& get_tracing_category() { return tracing_category_; }
133 AnyActivity* set_user_data(void* data)
136 return static_cast<AnyActivity*>(this);
139 void* get_user_data() { return user_data_; }
143 } // namespace simgrid
145 #endif /* SIMGRID_S4U_ACTIVITY_HPP */