e81a2080eb
Switch mutexes are no longer kernel objects, they are managed in userland and only use the kernel to handle the contention case. Mutex addresses store a special flag value (0x40000000) to notify the guest code that there are still some threads waiting for the mutex to be released. This flag is updated when a thread calls ArbitrateUnlock. TODO: * Fix svcWaitProcessWideKey * Fix svcSignalProcessWideKey * Remove the Mutex class.
113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <string>
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#include "common/common_types.h"
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#include "common/swap.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/kernel/wait_object.h"
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#include "core/hle/result.h"
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namespace Kernel {
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class Thread;
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class Mutex final : public WaitObject {
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public:
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/**
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* Creates a mutex.
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* @param holding_thread Specifies a thread already holding the mutex. If not nullptr, this
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* thread will acquire the mutex.
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* @param guest_addr Address of the object tracking the mutex in guest memory. If specified,
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* this mutex will update the guest object when its state changes.
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* @param name Optional name of mutex
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* @return Pointer to new Mutex object
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*/
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static SharedPtr<Mutex> Create(SharedPtr<Kernel::Thread> holding_thread, VAddr guest_addr = 0,
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std::string name = "Unknown");
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std::string GetTypeName() const override {
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return "Mutex";
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}
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std::string GetName() const override {
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return name;
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}
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static const HandleType HANDLE_TYPE = HandleType::Mutex;
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HandleType GetHandleType() const override {
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return HANDLE_TYPE;
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}
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u32 priority; ///< The priority of the mutex, used for priority inheritance.
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std::string name; ///< Name of mutex (optional)
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VAddr guest_addr; ///< Address of the guest mutex value
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/**
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* Elevate the mutex priority to the best priority
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* among the priorities of all its waiting threads.
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*/
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void UpdatePriority();
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bool ShouldWait(Thread* thread) const override;
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void Acquire(Thread* thread) override;
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void AddWaitingThread(SharedPtr<Thread> thread) override;
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void RemoveWaitingThread(Thread* thread) override;
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/**
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* Attempts to release the mutex from the specified thread.
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* @param thread Thread that wants to release the mutex.
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* @returns The result code of the operation.
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*/
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ResultCode Release(Thread* thread);
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/// Gets the handle to the holding process stored in the guest state.
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Handle GetOwnerHandle() const;
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/// Gets the Thread pointed to by the owner handle
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SharedPtr<Thread> GetHoldingThread() const;
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/// Sets the holding process handle in the guest state.
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void SetHoldingThread(SharedPtr<Thread> thread);
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/// Returns the has_waiters bit in the guest state.
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bool GetHasWaiters() const;
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/// Sets the has_waiters bit in the guest state.
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void SetHasWaiters(bool has_waiters);
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/// Flag that indicates that a mutex still has threads waiting for it.
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static constexpr u32 MutexHasWaitersFlag = 0x40000000;
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/// Mask of the bits in a mutex address value that contain the mutex owner.
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static constexpr u32 MutexOwnerMask = 0xBFFFFFFF;
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/// Attempts to acquire a mutex at the specified address.
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static ResultCode TryAcquire(VAddr address, Handle holding_thread_handle,
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Handle requesting_thread_handle);
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/// Releases the mutex at the specified address.
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static ResultCode Release(VAddr address);
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private:
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Mutex();
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~Mutex() override;
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/// Object in guest memory used to track the mutex state
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union GuestState {
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u32_le raw;
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/// Handle of the thread that currently holds the mutex, 0 if available
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BitField<0, 30, u32_le> holding_thread_handle;
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/// 1 when there are threads waiting for this mutex, otherwise 0
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BitField<30, 1, u32_le> has_waiters;
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};
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static_assert(sizeof(GuestState) == 4, "GuestState size is incorrect");
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};
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/**
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* Releases all the mutexes held by the specified thread
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* @param thread Thread that is holding the mutexes
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*/
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void ReleaseThreadMutexes(Thread* thread);
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} // namespace Kernel
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