-/* Copyright (c) 2006-201. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2018-2021. 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. */
#include "src/msg/msg_private.hpp"
-#include "src/simix/smx_synchro_private.hpp"
#include "xbt/log.h"
+#include "simgrid/forward.h"
#include "simgrid/s4u/Semaphore.hpp"
+#include "src/kernel/activity/SemaphoreImpl.hpp"
+#include "src/mc/checker/SimcallObserver.hpp"
namespace simgrid {
namespace s4u {
-Semaphore::Semaphore(unsigned int initial_capacity)
+SemaphorePtr Semaphore::create(unsigned int initial_capacity)
{
- sem_ = simgrid::simix::simcall([initial_capacity] { return SIMIX_sem_init(initial_capacity); });
+ auto* sem = new kernel::activity::SemaphoreImpl(initial_capacity);
+ return SemaphorePtr(&sem->sem(), false);
}
-Semaphore::~Semaphore()
+void Semaphore::acquire()
{
- SIMIX_sem_destroy(sem_);
+ kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
+ mc::SemAcquireSimcall observer{issuer, pimpl_};
+ kernel::actor::simcall_blocking<void>([&observer] { observer.get_sem()->acquire(observer.get_issuer(), -1.0); },
+ &observer);
}
-SemaphorePtr Semaphore::create(unsigned int initial_capacity)
+bool Semaphore::acquire_timeout(double timeout)
{
- return SemaphorePtr(new Semaphore(initial_capacity));
+ kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
+ mc::SemAcquireSimcall observer{issuer, pimpl_, timeout};
+ kernel::actor::simcall_blocking<void>(
+ [&observer] { observer.get_sem()->acquire(observer.get_issuer(), observer.get_timeout()); }, &observer);
+ return observer.get_result();
}
-void Semaphore::acquire()
+void Semaphore::release()
{
- simcall_sem_acquire(sem_);
+ kernel::actor::simcall([this] { pimpl_->release(); });
}
-void Semaphore::release()
+int Semaphore::get_capacity() const
+{
+ return kernel::actor::simcall([this] { return pimpl_->get_capacity(); });
+}
+
+bool Semaphore::would_block() const
{
- simgrid::simix::simcall([this] { SIMIX_sem_release(sem_); });
+ return kernel::actor::simcall([this] { return pimpl_->would_block(); });
}
-void intrusive_ptr_add_ref(Semaphore* sem)
+/* refcounting of the intrusive_ptr is delegated to the implementation object */
+void intrusive_ptr_add_ref(const Semaphore* sem)
{
xbt_assert(sem);
- sem->refcount_.fetch_add(1, std::memory_order_relaxed);
+ sem->pimpl_->ref();
}
-void intrusive_ptr_release(Semaphore* sem)
+void intrusive_ptr_release(const Semaphore* sem)
{
xbt_assert(sem);
- if (sem->refcount_.fetch_sub(1, std::memory_order_release) == 1) {
- std::atomic_thread_fence(std::memory_order_acquire);
- delete sem;
- }
+ sem->pimpl_->unref();
+}
+
+} // namespace s4u
+} // namespace simgrid
+
+/* **************************** Public C interface *************************** */
+/** @brief creates a semaphore object of the given initial capacity */
+sg_sem_t sg_sem_init(int initial_value)
+{
+ return simgrid::s4u::Semaphore::create(initial_value).detach();
+}
+
+/** @brief locks on a semaphore object */
+void sg_sem_acquire(sg_sem_t sem)
+{
+ sem->acquire();
+}
+
+/** @brief locks on a semaphore object up until the provided timeout expires */
+int sg_sem_acquire_timeout(sg_sem_t sem, double timeout)
+{
+ return sem->acquire_timeout(timeout);
+}
+
+/** @brief releases the semaphore object */
+void sg_sem_release(sg_sem_t sem)
+{
+ sem->release();
}
+int sg_sem_get_capacity(const_sg_sem_t sem)
+{
+ return sem->get_capacity();
}
+
+void sg_sem_destroy(const_sg_sem_t sem)
+{
+ intrusive_ptr_release(sem);
+}
+
+/** @brief returns a boolean indicating if this semaphore would block at this very specific time
+ *
+ * Note that the returned value may be wrong right after the function call, when you try to use it...
+ * But that's a classical semaphore issue, and SimGrid's semaphore are not different to usual ones here.
+ */
+int sg_sem_would_block(const_sg_sem_t sem)
+{
+ return sem->would_block();
}
