Atmosphere/libraries/libstratosphere/source/os/os_sdk_condition_variable.cpp

102 lines
3.8 KiB
C++

/*
* Copyright (c) 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"
namespace ams::os {
void SdkConditionVariableType::Wait(SdkMutexType &mutex) {
/* Check that we own the mutex. */
AMS_ABORT_UNLESS(os::IsSdkMutexLockedByCurrentThread(std::addressof(mutex)));
/* Wait on the mutex. */
GetReference(this->_storage).Wait(GetPointer(mutex._storage));
}
bool SdkConditionVariableType::TimedWait(SdkMutexType &mutex, TimeSpan timeout) {
/* Check preconditions. */
AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
AMS_ABORT_UNLESS(os::IsSdkMutexLockedByCurrentThread(std::addressof(mutex)));
/* Handle zero timeout by unlocking and re-locking. */
if (timeout == TimeSpan(0)) {
GetReference(mutex._storage).Leave();
GetReference(mutex._storage).Enter();
return false;
}
/* Handle timed wait. */
impl::TimeoutHelper timeout_helper(timeout);
auto status = GetReference(this->_storage).TimedWait(GetPointer(mutex._storage), timeout_helper);
return status == ConditionVariableStatus::Success;
}
void SdkConditionVariableType::Wait(SdkRecursiveMutexType &mutex) {
/* Check preconditions. */
AMS_ABORT_UNLESS(os::IsSdkRecursiveMutexLockedByCurrentThread(std::addressof(mutex)));
AMS_ABORT_UNLESS(mutex.recursive_count == 1);
/* Decrement the mutex's recursive count. */
--mutex.recursive_count;
/* Wait on the mutex. */
GetReference(this->_storage).Wait(GetPointer(mutex._storage));
/* Increment the mutex's recursive count. */
++mutex.recursive_count;
/* Check that the mutex's recursive count is valid. */
AMS_ABORT_UNLESS(mutex.recursive_count != 0);
}
bool SdkConditionVariableType::TimedWait(SdkRecursiveMutexType &mutex, TimeSpan timeout) {
/* Check preconditions. */
AMS_ASSERT(timeout.GetNanoSeconds() >= 0);
AMS_ABORT_UNLESS(os::IsSdkRecursiveMutexLockedByCurrentThread(std::addressof(mutex)));
/* Handle zero timeout by unlocking and re-locking. */
if (timeout == TimeSpan(0)) {
/* NOTE: Nintendo doesn't check recursive_count here...seems really suspicious? */
/* Not sure that this is correct, or if they just forgot to check. */
GetReference(mutex._storage).Leave();
GetReference(mutex._storage).Enter();
return false;
}
/* Check that the mutex is held exactly once. */
AMS_ABORT_UNLESS(mutex.recursive_count == 1);
/* Decrement the mutex's recursive count. */
--mutex.recursive_count;
/* Create timeout helper. */
impl::TimeoutHelper timeout_helper(timeout);
/* Perform timed wait. */
auto status = GetReference(this->_storage).TimedWait(GetPointer(mutex._storage), timeout_helper);
/* Increment the mutex's recursive count. */
++mutex.recursive_count;
/* Check that the mutex's recursive count is valid. */
AMS_ABORT_UNLESS(mutex.recursive_count != 0);
/* Return whether we succeeded. */
return status == ConditionVariableStatus::Success;
}
}