1 /* Copyright (c) 2018-2019. 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. */
9 #include "simgrid/Exception.hpp"
10 #include "simgrid/barrier.h"
11 #include "simgrid/s4u/Barrier.hpp"
12 #include "simgrid/simix.h"
13 #include "xbt/log.hpp"
15 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_barrier, "S4U barrier");
20 Barrier::Barrier(unsigned int expected_processes) : mutex_(Mutex::create()), cond_(ConditionVariable::create()), expected_processes_(expected_processes)
24 /** @brief Create a new barrier
28 BarrierPtr Barrier::create(unsigned int expected_processes)
30 return BarrierPtr(new Barrier(expected_processes));
40 XBT_DEBUG("waiting %p %u/%u", this, arrived_processes_, expected_processes_);
41 if (arrived_processes_ == expected_processes_) {
44 arrived_processes_ = 0;
53 void intrusive_ptr_add_ref(Barrier* barrier)
56 barrier->refcount_.fetch_add(1, std::memory_order_relaxed);
59 void intrusive_ptr_release(Barrier* barrier)
62 if (barrier->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
63 std::atomic_thread_fence(std::memory_order_acquire);
68 } // namespace simgrid
70 /* **************************** Public C interface *************************** */
72 sg_bar_t sg_barrier_init(unsigned int count)
74 return new simgrid::s4u::Barrier(count);
77 /** @brief Initializes a barrier, with count elements */
78 void sg_barrier_destroy(sg_bar_t bar)
83 /** @brief Performs a barrier already initialized */
84 int sg_barrier_wait(sg_bar_t bar)