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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "core/core.h"
#include "core/hle/kernel/k_event.h"
#include "core/hle/kernel/k_synchronization_object.h"
#include "core/hle/service/mutex.h"
namespace Service {
Mutex::Mutex(Core::System& system) : m_system(system) {
m_event = Kernel::KEvent::Create(system.Kernel());
m_event->Initialize(nullptr);
// Register the event.
Kernel::KEvent::Register(system.Kernel(), m_event);
ASSERT(R_SUCCEEDED(m_event->Signal()));
}
Mutex::~Mutex() {
m_event->GetReadableEvent().Close();
m_event->Close();
}
void Mutex::lock() {
// Infinitely retry until we successfully clear the event.
while (R_FAILED(m_event->GetReadableEvent().Reset())) {
s32 index;
Kernel::KSynchronizationObject* obj = &m_event->GetReadableEvent();
// The event was already cleared!
// Wait for it to become signaled again.
ASSERT(R_SUCCEEDED(
Kernel::KSynchronizationObject::Wait(m_system.Kernel(), &index, &obj, 1, -1)));
}
// We successfully cleared the event, and now have exclusive ownership.
}
void Mutex::unlock() {
// Unlock.
ASSERT(R_SUCCEEDED(m_event->Signal()));
}
} // namespace Service
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