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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <string>
#include "common/common_types.h"
#include "common/swap.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/wait_object.h"
#include "core/hle/result.h"
namespace Kernel {
class Thread;
class Mutex final : public WaitObject {
public:
/**
* Creates a mutex.
* @param holding_thread Specifies a thread already holding the mutex. If not nullptr, this
* thread will acquire the mutex.
* @param guest_addr Address of the object tracking the mutex in guest memory. If specified,
* this mutex will update the guest object when its state changes.
* @param name Optional name of mutex
* @return Pointer to new Mutex object
*/
static SharedPtr<Mutex> Create(SharedPtr<Kernel::Thread> holding_thread, VAddr guest_addr = 0,
std::string name = "Unknown");
std::string GetTypeName() const override {
return "Mutex";
}
std::string GetName() const override {
return name;
}
static const HandleType HANDLE_TYPE = HandleType::Mutex;
HandleType GetHandleType() const override {
return HANDLE_TYPE;
}
int lock_count; ///< Number of times the mutex has been acquired
u32 priority; ///< The priority of the mutex, used for priority inheritance.
std::string name; ///< Name of mutex (optional)
SharedPtr<Thread> holding_thread; ///< Thread that has acquired the mutex
VAddr guest_addr; ///< Address of the guest mutex value
/**
* Elevate the mutex priority to the best priority
* among the priorities of all its waiting threads.
*/
void UpdatePriority();
bool ShouldWait(Thread* thread) const override;
void Acquire(Thread* thread) override;
void AddWaitingThread(SharedPtr<Thread> thread) override;
void RemoveWaitingThread(Thread* thread) override;
/**
* Attempts to release the mutex from the specified thread.
* @param thread Thread that wants to release the mutex.
* @returns The result code of the operation.
*/
ResultCode Release(Thread* thread);
private:
Mutex();
~Mutex() override;
/// Object in guest memory used to track the mutex state
union GuestState {
u32_le raw;
/// Handle of the thread that currently holds the mutex, 0 if available
BitField<0, 30, u32_le> holding_thread_handle;
/// 1 when there are threads waiting for this mutex, otherwise 0
BitField<30, 1, u32_le> has_waiters;
};
static_assert(sizeof(GuestState) == 4, "GuestState size is incorrect");
/// Updates the state of the object tracking this mutex in guest memory
void UpdateGuestState();
/// Verifies the state of the object tracking this mutex in guest memory
void VerifyGuestState();
};
/**
* Releases all the mutexes held by the specified thread
* @param thread Thread that is holding the mutexes
*/
void ReleaseThreadMutexes(Thread* thread);
} // namespace Kernel
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