Atmosphere/libraries/libstratosphere/source/os/os_condition_variable.cpp
2020-04-08 02:21:35 -07:00

108 lines
3.5 KiB
C++

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "impl/os_thread_manager.hpp"
#include "impl/os_timeout_helper.hpp"
#include "impl/os_mutex_impl.hpp"
namespace ams::os {
void InitializeConditionVariable(ConditionVariableType *cv) {
/* Construct object. */
new (GetPointer(cv->_storage)) impl::InternalConditionVariable;
/* Mark initialized. */
cv->state = ConditionVariableType::State_Initialized;
}
void FinalizeConditionVariable(ConditionVariableType *cv) {
AMS_ASSERT(cv->state == ConditionVariableType::State_Initialized);
/* Mark not initialized. */
cv->state = ConditionVariableType::State_NotInitialized;
/* Destroy objects. */
GetReference(cv->_storage).~InternalConditionVariable();
}
void SignalConditionVariable(ConditionVariableType *cv) {
AMS_ASSERT(cv->state == ConditionVariableType::State_Initialized);
GetReference(cv->_storage).Signal();
}
void BroadcastConditionVariable(ConditionVariableType *cv) {
AMS_ASSERT(cv->state == ConditionVariableType::State_Initialized);
GetReference(cv->_storage).Broadcast();
}
void WaitConditionVariable(ConditionVariableType *cv, MutexType *m) {
AMS_ASSERT(cv->state == ConditionVariableType::State_Initialized);
AMS_ASSERT(m->state == MutexType::State_Initialized);
AMS_ASSERT(m->owner_thread == impl::GetCurrentThread());
AMS_ASSERT(m->nest_count == 1);
impl::PopAndCheckLockLevel(m);
if ((--m->nest_count) == 0) {
m->owner_thread = nullptr;
}
GetReference(cv->_storage).Wait(GetPointer(m->_storage));
impl::PushAndCheckLockLevel(m);
++m->nest_count;
m->owner_thread = impl::GetCurrentThread();
}
ConditionVariableStatus TimedWaitConditionVariable(ConditionVariableType *cv, MutexType *m, TimeSpan timeout) {
AMS_ASSERT(cv->state == ConditionVariableType::State_Initialized);
AMS_ASSERT(m->state == MutexType::State_Initialized);
AMS_ASSERT(m->owner_thread == impl::GetCurrentThread());
AMS_ASSERT(m->nest_count == 1);
AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
impl::PopAndCheckLockLevel(m);
if ((--m->nest_count) == 0) {
m->owner_thread = nullptr;
}
ConditionVariableStatus status;
if (timeout == TimeSpan(0)) {
GetReference(m->_storage).Leave();
GetReference(m->_storage).Enter();
status = ConditionVariableStatus::TimedOut;
} else {
impl::TimeoutHelper timeout_helper(timeout);
status = GetReference(cv->_storage).TimedWait(GetPointer(m->_storage), timeout_helper);
}
impl::PushAndCheckLockLevel(m);
++m->nest_count;
m->owner_thread = impl::GetCurrentThread();
return status;
}
}