1 /* Copyright (c) 2012-2022. 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_KERNEL_ACTIVITY_BARRIER_HPP
7 #define SIMGRID_KERNEL_ACTIVITY_BARRIER_HPP
9 #include "simgrid/s4u/Barrier.hpp"
10 #include "src/kernel/activity/ActivityImpl.hpp"
11 #include "src/kernel/actor/ActorImpl.hpp"
12 #include "src/kernel/actor/SynchroObserver.hpp"
17 /** Barrier Acquisition: the act / process of acquiring the barrier.
19 * This is the asynchronous activity associated to Barriers. See the doc of MutexImpl for more details on the rationnal.
21 class XBT_PUBLIC BarrierAcquisitionImpl : public ActivityImpl_T<BarrierAcquisitionImpl> {
22 actor::ActorImpl* issuer_ = nullptr;
23 BarrierImpl* barrier_ = nullptr;
24 bool granted_ = false;
26 friend actor::BarrierObserver;
30 BarrierAcquisitionImpl(actor::ActorImpl* issuer, BarrierImpl* bar) : issuer_(issuer), barrier_(bar) {}
31 BarrierImplPtr get_barrier() { return barrier_; }
32 actor::ActorImpl* get_issuer() { return issuer_; }
34 bool test(actor::ActorImpl* issuer = nullptr) override;
35 void wait_for(actor::ActorImpl* issuer, double timeout) override;
39 void finish() override;
40 void set_exception(actor::ActorImpl* issuer) override
45 class XBT_PUBLIC BarrierImpl {
46 std::atomic_int_fast32_t refcount_{1};
48 unsigned int expected_actors_;
49 std::deque<BarrierAcquisitionImplPtr> ongoing_acquisitions_;
50 static unsigned next_id_;
51 unsigned id_ = next_id_++;
53 friend BarrierAcquisitionImpl;
57 explicit BarrierImpl(int expected_actors) : piface_(this), expected_actors_(expected_actors) {}
58 BarrierImpl(BarrierImpl const&) = delete;
59 BarrierImpl& operator=(BarrierImpl const&) = delete;
61 BarrierAcquisitionImplPtr acquire_async(actor::ActorImpl* issuer);
62 unsigned get_id() const { return id_; }
64 friend void intrusive_ptr_add_ref(BarrierImpl* barrier)
66 XBT_ATTRIB_UNUSED auto previous = barrier->refcount_.fetch_add(1);
67 xbt_assert(previous != 0);
70 friend void intrusive_ptr_release(BarrierImpl* barrier)
72 if (barrier->refcount_.fetch_sub(1) == 1)
76 s4u::Barrier& get_iface() { return piface_; }
78 } // namespace activity
80 } // namespace simgrid