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// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include "common/common_types.h"
#include "common/uuid.h"
#include "core/hle/kernel/k_shared_memory.h"
#include "core/hle/service/time/clock_types.h"
namespace Service::Time {
// Note: this type is not safe for concurrent writes.
template <typename T>
struct LockFreeAtomicType {
u32 counter_;
std::array<T, 2> value_;
};
template <typename T>
static inline void StoreToLockFreeAtomicType(LockFreeAtomicType<T>* p, const T& value) {
// Get the current counter.
auto counter = p->counter_;
// Increment the counter.
++counter;
// Store the updated value.
p->value_[counter % 2] = value;
// Fence memory.
std::atomic_thread_fence(std::memory_order_release);
// Set the updated counter.
p->counter_ = counter;
}
template <typename T>
static inline T LoadFromLockFreeAtomicType(const LockFreeAtomicType<T>* p) {
while (true) {
// Get the counter.
auto counter = p->counter_;
// Get the value.
auto value = p->value_[counter % 2];
// Fence memory.
std::atomic_thread_fence(std::memory_order_acquire);
// Check that the counter matches.
if (counter == p->counter_) {
return value;
}
}
}
class SharedMemory final {
public:
explicit SharedMemory(Core::System& system_);
~SharedMemory();
// Shared memory format
struct Format {
LockFreeAtomicType<Clock::StandardSteadyClockTimePointType> standard_steady_clock_timepoint;
LockFreeAtomicType<Clock::SystemClockContext> standard_local_system_clock_context;
LockFreeAtomicType<Clock::SystemClockContext> standard_network_system_clock_context;
LockFreeAtomicType<bool> is_standard_user_system_clock_automatic_correction_enabled;
u32 format_version;
};
static_assert(offsetof(Format, standard_steady_clock_timepoint) == 0x0);
static_assert(offsetof(Format, standard_local_system_clock_context) == 0x38);
static_assert(offsetof(Format, standard_network_system_clock_context) == 0x80);
static_assert(offsetof(Format, is_standard_user_system_clock_automatic_correction_enabled) ==
0xc8);
static_assert(sizeof(Format) == 0xd8, "Format is an invalid size");
void SetupStandardSteadyClock(const Common::UUID& clock_source_id,
Clock::TimeSpanType current_time_point);
void UpdateLocalSystemClockContext(const Clock::SystemClockContext& context);
void UpdateNetworkSystemClockContext(const Clock::SystemClockContext& context);
void SetAutomaticCorrectionEnabled(bool is_enabled);
Format* GetFormat();
private:
Core::System& system;
};
} // namespace Service::Time
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