60 lines
1.7 KiB
C++
60 lines
1.7 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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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 initial_count Number of slots reserved for other threads
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* @param max_count Maximum number of slots the semaphore can have
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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(s32 initial_count, s32 max_count,
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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 max_count; ///< Maximum number of simultaneous holders the semaphore can have
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s32 available_count; ///< Number of free slots left in the semaphore
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std::string name; ///< Name of semaphore (optional)
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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 certain number of slots from a semaphore.
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* @param release_count The number of slots to release
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* @return The number of free slots the semaphore had before this call
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*/
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ResultVal<s32> Release(s32 release_count);
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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
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