X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/62534c29d0fe83dbec6b7e7642d2ecbe100f3d7b..916422155091e4e7e0f463cec933b88fed642e8a:/include/simgrid/s4u/Semaphore.hpp

diff --git a/include/simgrid/s4u/Semaphore.hpp b/include/simgrid/s4u/Semaphore.hpp
index 442b147eb1..99089a7553 100644
--- a/include/simgrid/s4u/Semaphore.hpp
+++ b/include/simgrid/s4u/Semaphore.hpp
@@ -1,4 +1,4 @@
-/* Copyright (c) 2006-2018. The SimGrid Team. All rights reserved.          */
+/* Copyright (c) 2006-2023. 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. */
@@ -7,48 +7,55 @@
 #define SIMGRID_S4U_SEMAPHORE_HPP
 
 #include <simgrid/forward.h>
-#include <simgrid/simix.h>
 
-namespace simgrid {
-namespace s4u {
+namespace simgrid::s4u {
 
 /** @brief A classical semaphore, but blocking in the simulation world
- *  @ingroup s4u_api
  *
+ * @beginrst
  * It is strictly impossible to use a real semaphore, such as
- * <a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_init.html">sem_init</a>,
+ * `sem_init <http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_init.html>`_,
  * because it would block the whole simulation.
  * Instead, you should use the present class, that offers a very similar interface.
  *
- * As for any S4U object, Semaphores are using the @ref s4u_raii "RAII idiom" for memory management.
- * Use createSemaphore() to get a ::SemaphorePtr to a newly created semaphore
- * and only manipulate ::SemaphorePtr.
+ * An example is available in Section :ref:`s4u_ex_IPC`.
+ *
+ * As for any S4U object, you can use the :ref:`RAII idiom <s4u_raii>` for memory management of semaphores.
+ * Use :cpp:func:`create() <simgrid::s4u::Mutex::create()>` to get a :cpp:type:`simgrid::s4u::SemaphorePtr` to a newly
+ * created semaphore, that will get automatically freed when the variable goes out of scope.
+ * @endrst
  *
  */
 class XBT_PUBLIC Semaphore {
-  smx_sem_t sem_;
-  std::atomic_int_fast32_t refcount_{0};
+#ifndef DOXYGEN
+  friend kernel::activity::SemaphoreImpl;
+  friend XBT_PUBLIC void kernel::activity::intrusive_ptr_release(kernel::activity::SemaphoreImpl* sem);
+#endif
 
-  explicit Semaphore(unsigned int initial_capacity);
-  ~Semaphore();
+  kernel::activity::SemaphoreImpl* const pimpl_;
 
-  friend void intrusive_ptr_add_ref(Semaphore* sem);
-  friend void intrusive_ptr_release(Semaphore* sem);
+  friend XBT_PUBLIC void intrusive_ptr_add_ref(const Semaphore* sem);
+  friend XBT_PUBLIC void intrusive_ptr_release(const Semaphore* sem);
 
-public:
-  // No copy:
-  /** You cannot create a new semaphore by copying an existing one. Use SemaphorePtr instead */
-  Semaphore(Semaphore const&) = delete;
-  /** You cannot create a new semaphore by value assignment either. Use SemaphorePtr instead */
-  Semaphore& operator=(Semaphore const&) = delete;
+  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();
+  /** Returns true if there was a timeout */
+  bool acquire_timeout(double timeout);
   void release();
+  int get_capacity() const;
+  bool would_block() const;
 };
 
-}} // namespace simgrid::s4u
+} // namespace simgrid::s4u
 
 #endif /* SIMGRID_S4U_SEMAPHORE_HPP */