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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 <queue>
#include <string>
#include "common/common_types.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/wait_object.h"
#include "core/hle/result.h"
namespace Kernel {
class Semaphore final : public WaitObject {
public:
/**
* Creates a semaphore.
* @param initial_count Number of slots reserved for other threads
* @param max_count Maximum number of slots the semaphore can have
* @param name Optional name of semaphore
* @return The created semaphore
*/
static ResultVal<SharedPtr<Semaphore>> Create(s32 initial_count, s32 max_count, VAddr address,
std::string name = "Unknown");
std::string GetTypeName() const override {
return "Semaphore";
}
std::string GetName() const override {
return name;
}
static const HandleType HANDLE_TYPE = HandleType::Semaphore;
HandleType GetHandleType() const override {
return HANDLE_TYPE;
}
s32 max_count; ///< Maximum number of simultaneous holders the semaphore can have
s32 available_count; ///< Number of free slots left in the semaphore
VAddr address;
std::string name; ///< Name of semaphore (optional)
bool ShouldWait(Thread* thread) const override;
void Acquire(Thread* thread) override;
/**
* Releases a certain number of slots from a semaphore.
* @param release_count The number of slots to release
* @return The number of free slots the semaphore had before this call
*/
ResultVal<s32> Release(s32 release_count);
private:
Semaphore();
~Semaphore() override;
};
} // namespace
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