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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 guest_addr Address of the object tracking the semaphore in guest memory. If specified,
* this semaphore will update the guest object when its state changes.
* @param mutex_addr Optional address of a guest mutex associated with this semaphore, used by
* the OS for implementing events.
* @param name Optional name of semaphore.
* @return The created semaphore.
*/
static ResultVal<SharedPtr<Semaphore>> Create(VAddr guest_addr, VAddr mutex_addr = 0,
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
std::string name; ///< Name of semaphore (optional)
VAddr guest_addr; ///< Address of the guest semaphore value
VAddr mutex_addr; ///< (optional) Address of guest mutex value associated with this semaphore,
///< used for implementing events
bool ShouldWait(Thread* thread) const override;
void Acquire(Thread* thread) override;
/**
* Releases a slot from a semaphore.
* @param target The number of threads to wakeup, -1 is all.
* @return ResultCode indicating if the operation succeeded.
*/
ResultCode Release(s32 target);
private:
Semaphore();
~Semaphore() override;
/// Updates the state of the object tracking this semaphore in guest memory
void UpdateGuestState();
};
} // namespace Kernel
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