src/s4u/s4u_Semaphore.cpp

   1 /* Copyright (c) 2006-201. The SimGrid Team. All rights reserved.          */
   2
   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. */
   5
   6 #include "src/msg/msg_private.hpp"
   7 #include "src/simix/smx_synchro_private.hpp"
   8 #include "xbt/log.h"
   9
  10 #include "simgrid/s4u/Semaphore.hpp"
  11
  12 namespace simgrid {
  13 namespace s4u {
  14
  15 Semaphore::Semaphore(unsigned int initial_capacity)
  16 {
  17     sem_ = simgrid::simix::simcall([initial_capacity] { return SIMIX_sem_init(initial_capacity); });
  18 }
  19
  20 Semaphore::~Semaphore()
  21 {
  22     SIMIX_sem_destroy(sem_);
  23 }
  24
  25 SemaphorePtr Semaphore::create(unsigned int initial_capacity)
  26 {
  27     return SemaphorePtr(new Semaphore(initial_capacity));
  28 }
  29
  30 void Semaphore::acquire()
  31 {
  32     simcall_sem_acquire(sem_);
  33 }
  34
  35 void Semaphore::release()
  36 {
  37     simgrid::simix::simcall([this] { SIMIX_sem_release(sem_); });
  38 }
  39
  40 void intrusive_ptr_add_ref(Semaphore* sem)
  41 {
  42   xbt_assert(sem);
  43   sem->refcount_.fetch_add(1, std::memory_order_relaxed);
  44 }
  45
  46 void intrusive_ptr_release(Semaphore* sem)
  47 {
  48   xbt_assert(sem);
  49   if (sem->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
  50     std::atomic_thread_fence(std::memory_order_acquire);
  51     delete sem;
  52   }
  53 }
  54
  55 }
  56 }