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https://github.com/Atmosphere-NX/Atmosphere
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96f95b9f95
* result: try out some experimental shenanigans * result: sketch out some more shenanigans * result: see what it looks like to convert kernel to use result conds instead of guards * make rest of kernel use experimental new macro-ing
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <mesosphere/kern_common.hpp>
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#include <mesosphere/kern_k_light_lock.hpp>
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namespace ams::kern {
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class KUnsafeMemory {
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private:
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mutable KLightLock m_lock;
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size_t m_limit_size;
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size_t m_current_size;
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public:
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constexpr KUnsafeMemory() : m_lock(), m_limit_size(), m_current_size() { /* ... */ }
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bool TryReserve(size_t size) {
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MESOSPHERE_ASSERT_THIS();
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KScopedLightLock lk(m_lock);
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/* Test for overflow. */
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if (m_current_size > m_current_size + size) {
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return false;
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}
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/* Test for limit allowance. */
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if (m_current_size + size > m_limit_size) {
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return false;
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}
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/* Reserve the size. */
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m_current_size += size;
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return true;
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}
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void Release(size_t size) {
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MESOSPHERE_ASSERT_THIS();
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KScopedLightLock lk(m_lock);
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MESOSPHERE_ABORT_UNLESS(m_current_size >= size);
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m_current_size -= size;
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}
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size_t GetLimitSize() const {
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MESOSPHERE_ASSERT_THIS();
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KScopedLightLock lk(m_lock);
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return m_limit_size;
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}
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size_t GetCurrentSize() const {
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MESOSPHERE_ASSERT_THIS();
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KScopedLightLock lk(m_lock);
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return m_current_size;
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}
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Result SetLimitSize(size_t size) {
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MESOSPHERE_ASSERT_THIS();
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KScopedLightLock lk(m_lock);
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R_UNLESS(size >= m_current_size, svc::ResultLimitReached());
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m_limit_size = size;
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R_SUCCEED();
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}
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};
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}
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