mirror of
https://github.com/wpilibsuite/allwpilib
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69d9ad70ab
This is the changes made by Patrick Plenefisch converting the native code to use CMake and the CMake Maven Plugin, as opposed to the native Maven plugin. This is to allow for compatibility with newer versions of the GCC toolchain. All the cpp sources were moved from maven style directories to cpp style directories for CMake. Change-Id: I67f5e3608948f37c83b0990d232105a3784f8593
121 lines
3.3 KiB
C++
121 lines
3.3 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) FIRST 2008. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib. */
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/*----------------------------------------------------------------------------*/
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#include "HAL/cpp/Resource.h"
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#include "HAL/Errors.h"
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#include <cstddef>
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ReentrantSemaphore Resource::m_createLock;
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/**
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* Allocate storage for a new instance of Resource.
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* Allocate a bool array of values that will get initialized to indicate that no resources
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* have been allocated yet. The indicies of the resources are [0 .. elements - 1].
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*/
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Resource::Resource(uint32_t elements)
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{
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Synchronized sync(m_createLock);
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m_size = elements;
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m_isAllocated = new bool[m_size];
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for (uint32_t i=0; i < m_size; i++)
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{
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m_isAllocated[i] = false;
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}
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}
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/**
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* Factory method to create a Resource allocation-tracker *if* needed.
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*
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* @param r -- address of the caller's Resource pointer. If *r == NULL, this
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* will construct a Resource and make *r point to it. If *r != NULL, i.e.
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* the caller already has a Resource instance, this won't do anything.
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* @param elements -- the number of elements for this Resource allocator to
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* track, that is, it will allocate resource numbers in the range
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* [0 .. elements - 1].
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*/
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/*static*/ void Resource::CreateResourceObject(Resource **r, uint32_t elements)
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{
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Synchronized sync(m_createLock);
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if (*r == NULL)
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{
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*r = new Resource(elements);
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}
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}
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/**
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* Delete the allocated array or resources.
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* This happens when the module is unloaded (provided it was statically allocated).
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*/
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Resource::~Resource()
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{
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delete[] m_isAllocated;
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}
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/**
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* Allocate a resource.
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* When a resource is requested, mark it allocated. In this case, a free resource value
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* within the range is located and returned after it is marked allocated.
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*/
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uint32_t Resource::Allocate(const char *resourceDesc)
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{
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Synchronized sync(m_allocateLock);
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for (uint32_t i=0; i < m_size; i++)
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{
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if (!m_isAllocated[i])
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{
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m_isAllocated[i] = true;
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return i;
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}
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}
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// TODO: wpi_setWPIErrorWithContext(NoAvailableResources, resourceDesc);
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return ~0ul;
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}
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/**
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* Allocate a specific resource value.
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* The user requests a specific resource value, i.e. channel number and it is verified
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* unallocated, then returned.
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*/
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uint32_t Resource::Allocate(uint32_t index, const char *resourceDesc)
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{
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Synchronized sync(m_allocateLock);
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if (index >= m_size)
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{
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// TODO: wpi_setWPIErrorWithContext(ChannelIndexOutOfRange, resourceDesc);
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return ~0ul;
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}
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if ( m_isAllocated[index] )
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{
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// TODO: wpi_setWPIErrorWithContext(ResourceAlreadyAllocated, resourceDesc);
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return ~0ul;
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}
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m_isAllocated[index] = true;
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return index;
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}
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/**
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* Free an allocated resource.
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* After a resource is no longer needed, for example a destructor is called for a channel assignment
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* class, Free will release the resource value so it can be reused somewhere else in the program.
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*/
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void Resource::Free(uint32_t index)
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{
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Synchronized sync(m_allocateLock);
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if (index == ~0ul) return;
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if (index >= m_size)
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{
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// TODO: wpi_setWPIError(NotAllocated);
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return;
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}
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if (!m_isAllocated[index])
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{
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// TODO: wpi_setWPIError(NotAllocated);
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return;
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}
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m_isAllocated[index] = false;
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}
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