-/* Copyright (c) 2006-2019. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2006-2020. 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. */
#include "xbt/asserts.h"
#include <atomic>
+#include <set>
#include <simgrid/forward.h>
+#include <string>
+#include <vector>
+#include <xbt/log.hpp>
#include <xbt/signal.hpp>
+XBT_LOG_EXTERNAL_CATEGORY(s4u_activity);
+
namespace simgrid {
namespace s4u {
*
* This class is the ancestor of every activities that an actor can undertake.
* 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;
protected:
Activity() = default;
virtual ~Activity() = default;
-
public:
#ifndef DOXYGEN
Activity(Activity const&) = delete;
Activity& operator=(Activity const&) = delete;
#endif
- enum class State { INITED = 0, STARTED, CANCELED, ERRORED, FINISHED };
+ enum class State { INITED = 0, STARTING, STARTED, CANCELED, ERRORED, FINISHED };
/** Starts a previously created activity.
*
virtual Activity* cancel() = 0;
/** Retrieve the current state of the activity */
Activity::State get_state() { return state_; }
+ void set_state(Activity::State state) { state_ = state; }
/** Tests whether the given activity is terminated yet. This is a pure function. */
virtual bool test() = 0;
* It is forbidden to change the amount of work once the Activity is started */
Activity* set_remaining(double remains);
- /** Put some user data onto the Activity */
-
+ /** Returns the internal implementation of this Activity */
kernel::activity::ActivityImpl* get_impl() const { return pimpl_.get(); }
private:
template <class AnyActivity> class Activity_T : public Activity {
private:
- std::string name_ = "";
+ std::string name_ = "unnamed";
std::string tracing_category_ = "";
void* user_data_ = nullptr;
std::atomic_int_fast32_t refcount_{0};
+ std::vector<AnyActivity*> successors_;
+ std::set<AnyActivity*> dependencies_;
public:
#ifndef DOXYGEN
- friend XBT_PUBLIC void intrusive_ptr_release(AnyActivity* a)
+ friend void intrusive_ptr_release(AnyActivity* a)
{
if (a->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
std::atomic_thread_fence(std::memory_order_acquire);
delete a;
}
}
- friend XBT_PUBLIC void intrusive_ptr_add_ref(AnyActivity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
+ friend void intrusive_ptr_add_ref(AnyActivity* a) { a->refcount_.fetch_add(1, std::memory_order_relaxed); }
#endif
+
+ void add_successor(AnyActivity* a)
+ {
+ successors_.push_back(a);
+ a->add_dependency_on(static_cast<AnyActivity*>(this));
+ }
+ void remove_successor() { successors_.pop_back(); }
+ AnyActivity* get_successor() { return successors_.back(); }
+ bool has_successors() { return not successors_.empty(); }
+
+ void add_dependency_on(AnyActivity* a) { dependencies_.insert({a}); }
+ void remove_dependency_on(AnyActivity* a) { dependencies_.erase(a); }
+ bool has_dependencies() { return not dependencies_.empty(); }
+ void release_dependencies()
+ {
+ while (has_successors()) {
+ AnyActivity* b = get_successor();
+ XBT_CDEBUG(s4u_activity, "Remove a dependency from '%s' on '%s'", get_cname(), b->get_cname());
+ b->remove_dependency_on(static_cast<AnyActivity*>(this));
+ if (not b->has_dependencies()) {
+ b->vetoable_start();
+ }
+ remove_successor();
+ }
+ }
+
+ AnyActivity* vetoable_start()
+ {
+ set_state(State::STARTING);
+ if (has_dependencies())
+ return static_cast<AnyActivity*>(this);
+ set_state(State::STARTED);
+ XBT_CDEBUG(s4u_activity, "All dependencies are solved, let's start '%s'", get_cname());
+ static_cast<AnyActivity*>(this)->start();
+ return static_cast<AnyActivity*>(this);
+ }
+
AnyActivity* set_name(const std::string& name)
{
xbt_assert(get_state() == State::INITED, "Cannot change the name of an activity after its start");
