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https://github.com/yuzu-emu/yuzu-android
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db3a525166
Also properly keep track of data in guest memory, this fixes managing the semaphore from userland. It was found that Semaphores are actually Condition Variables, with Release(1) and Release(-1) being equivalent to notify_one and notify_all. We should change the name of the class to reflect this.
67 lines
2.1 KiB
C++
67 lines
2.1 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 <queue>
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#include <string>
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#include "common/common_types.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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// TODO(Subv): This is actually a Condition Variable.
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class Semaphore final : public WaitObject {
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public:
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/**
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* Creates a semaphore.
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* @param guest_addr Address of the object tracking the semaphore in guest memory. If specified,
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* this semaphore will update the guest object when its state changes.
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* @param mutex_addr Optional address of a guest mutex associated with this semaphore, used by
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* the OS for implementing events.
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* @param name Optional name of semaphore.
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* @return The created semaphore.
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*/
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static ResultVal<SharedPtr<Semaphore>> Create(VAddr guest_addr, VAddr mutex_addr = 0,
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std::string name = "Unknown");
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std::string GetTypeName() const override {
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return "Semaphore";
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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::Semaphore;
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HandleType GetHandleType() const override {
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return HANDLE_TYPE;
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}
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s32 GetAvailableCount() const;
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void SetAvailableCount(s32 value) const;
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std::string name; ///< Name of semaphore (optional)
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VAddr guest_addr; ///< Address of the guest semaphore value
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VAddr mutex_addr; ///< (optional) Address of guest mutex value associated with this semaphore,
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///< used for implementing events
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bool ShouldWait(Thread* thread) const override;
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void Acquire(Thread* thread) override;
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/**
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* Releases a slot from a semaphore.
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* @param target The number of threads to wakeup, -1 is all.
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* @return ResultCode indicating if the operation succeeded.
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*/
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ResultCode Release(s32 target);
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private:
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Semaphore();
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~Semaphore() override;
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};
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} // namespace Kernel
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