-/* Copyright (c) 2006-2020. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2006-2021. 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. */
/** @brief A classical semaphore, but blocking in the simulation world
*
- * @rst
+ * @beginrst
* It is strictly impossible to use a real semaphore, such as
* `sem_init <http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_init.html>`_,
* because it would block the whole simulation.
*
*/
class XBT_PUBLIC Semaphore {
- smx_sem_t sem_;
- std::atomic_int_fast32_t refcount_{0};
+ friend kernel::activity::SemaphoreImpl;
+ friend void kernel::activity::intrusive_ptr_release(kernel::activity::SemaphoreImpl* sem);
- friend void intrusive_ptr_add_ref(Semaphore* sem);
- friend void intrusive_ptr_release(Semaphore* sem);
+ kernel::activity::SemaphoreImpl* const pimpl_;
-public:
- explicit Semaphore(unsigned int initial_capacity);
- ~Semaphore();
+ friend void intrusive_ptr_add_ref(const Semaphore* sem);
+ friend void intrusive_ptr_release(const Semaphore* sem);
+ explicit Semaphore(kernel::activity::SemaphoreImpl* sem) : pimpl_(sem) {}
+ ~Semaphore() = default;
#ifndef DOXYGEN
Semaphore(Semaphore const&) = delete; // No copy constructor. Use SemaphorePtr instead
Semaphore& operator=(Semaphore const&) = delete; // No direct assignment either. Use SemaphorePtr instead
#endif
+public:
/** Constructs a new semaphore */
static SemaphorePtr create(unsigned int initial_capacity);
void acquire();
- int acquire_timeout(double timeout);
+ bool acquire_timeout(double timeout);
void release();
int get_capacity() const;
- int would_block() const;
+ bool would_block() const;
};
} // namespace s4u