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FRC2016-old/DriveBase/wpilib/cpp/current/include/Resource.h

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2016-01-28 11:33:19 -05:00
/*----------------------------------------------------------------------------*/
/* Copyright (c) FIRST 2008-2016. All Rights Reserved. */
/* Open Source Software - may be modified and shared by FRC teams. The code */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project. */
/*----------------------------------------------------------------------------*/
#pragma once
#include "ErrorBase.h"
#include <stdint.h>
#include <memory>
#include <vector>
#include "HAL/cpp/priority_mutex.h"
/**
* The Resource class is a convenient way to track allocated resources.
* It tracks them as indicies in the range [0 .. elements - 1].
* E.g. the library uses this to track hardware channel allocation.
*
* The Resource class does not allocate the hardware channels or other
* resources; it just tracks which indices were marked in use by
* Allocate and not yet freed by Free.
*/
class Resource : public ErrorBase {
public:
virtual ~Resource() = default;
Resource(const Resource&) = delete;
Resource& operator=(const Resource&) = delete;
static void CreateResourceObject(std::unique_ptr<Resource>& r, uint32_t elements);
explicit Resource(uint32_t size);
uint32_t Allocate(const std::string &resourceDesc);
uint32_t Allocate(uint32_t index, const std::string &resourceDesc);
void Free(uint32_t index);
private:
std::vector<bool> m_isAllocated;
priority_recursive_mutex m_allocateLock;
static priority_recursive_mutex m_createLock;
};