1 /* Copyright (c) 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_KERNEL_ACTIVITY_SEMAPHOREIMPL_HPP_
7 #define SIMGRID_KERNEL_ACTIVITY_SEMAPHOREIMPL_HPP_
10 #include <boost/intrusive/list.hpp>
12 #include "simgrid/s4u/Semaphore.hpp"
13 #include "src/simix/ActorImpl.hpp"
19 class XBT_PUBLIC SemaphoreImpl {
21 explicit SemaphoreImpl(unsigned int value) : value_(value){};
22 ~SemaphoreImpl() = default;
24 SemaphoreImpl(SemaphoreImpl const&) = delete;
25 SemaphoreImpl& operator=(SemaphoreImpl const&) = delete;
27 void acquire(smx_actor_t issuer, double timeout);
29 bool would_block() { return (value_ == 0); }
30 unsigned int get_capacity() { return value_; }
32 friend void intrusive_ptr_add_ref(SemaphoreImpl* sem)
34 XBT_ATTRIB_UNUSED auto previous = sem->refcount_.fetch_add(1);
35 xbt_assert(previous != 0);
37 friend void intrusive_ptr_release(SemaphoreImpl* sem)
39 if (sem->refcount_.fetch_sub(1) == 1)
44 actor::SynchroList sleeping_; /* list of sleeping actors*/
47 std::atomic_int_fast32_t refcount_{1};
49 } // namespace activity
51 } // namespace simgrid
53 #endif /* SIMGRID_KERNEL_ACTIVITY_SEMAPHOREIMPL_HPP_ */