CoreLinux++
0.4.32
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Memory is high speed transient storage managed by the operating system, for both itself and user processes, used to store data and programs. More...
#include <Memory.hpp>
Public Member Functions | |
Memory (void) throw ( Assertion ) | |
Default constructor. | |
virtual | ~Memory (void) |
Virtual Destructor. | |
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Synchronized (void) | |
Default constructor. | |
Synchronized (SynchronizedCref) | |
Copy constructor. | |
virtual | ~Synchronized (void) |
Virtual Destructor. | |
SynchronizedRef | operator= (SynchronizedCref) |
Assignment operator. | |
bool | operator== (SynchronizedCref) const |
Equality operator. | |
Static Public Member Functions | |
static MemoryStoragePtr | createStorage (Size aByteSize, Int Rights=OWNER_ALL) throw ( StorageException ) |
Default create method, creates a private block of read write shared memory of size aByteSize, sharing attributes default to owner. More... | |
static MemoryStoragePtr | createStorage (MemoryIdentifierCref aIdentifier, Size aByteSize, CreateDisposition disp=CREATE_OR_REUSE, Int Rights=OWNER_ALL, AddressingConstraint addressing=READ_WRITE) |
Create method, creates or opens a specifically identified block of shared memory of size aByteSize, sharing attributes default to owner. More... | |
static MemoryStoragePtr | createStorage (CharCptr aName, Size aByteSize, CreateDisposition disp=CREATE_OR_REUSE, Int Rights=OWNER_ALL, AddressingConstraint addressing=READ_WRITE) |
Create method, creates or opens a specifically identified block of shared memory of size aByteSize, sharing attributes default to owner. More... | |
static void | destroyStorage (MemoryStoragePtr) |
Destroy a previously allocated storage block. More... | |
Protected Member Functions | |
Memory (MemoryCref) throw ( Assertion ) | |
Copy constructor prohibited. | |
MemoryRef | operator= (MemoryCref) throw ( Assertion ) |
Assignment operator prohibited. | |
bool | operator== (MemoryCref) const |
Equality always returns false. | |
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Guard | access (void) const throw (SemaphoreException) |
Access returns a instance of Guard which is block scoped to the caller. More... | |
Static Protected Attributes | |
static MemoryManager | theMemoryManager |
The singleton instance of Memory for synchronization. | |
Additional Inherited Members | |
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typedef Guard * | GuardPtr |
typedef const Guard * | GuardCptr |
typedef Guard & | GuardRef |
typedef const Guard & | GuardCref |
Memory is high speed transient storage managed by the operating system, for both itself and user processes, used to store data and programs.
Upon allocation request, the operating system provides user processes with a memory storage region that is in addition to the current memory resources (stack, program, data) of the process. The memory can be made visible to all processes in the system, a select few, or just to the process that requested the storage. If made visible to other processes, memory provides a fast and efficient way to transfer information between the processes, and in this manner can be catagorized as high speed interprocess communication. It is up to the processes that share this memory area to agree on a synchronization protocol. The operating system allows a process to "mark" a memory region attribute as:
Read only
Memory marked with this attribute restrict processes to read only operations performed on the memory storage region. Attempts to write anything to this area will result in a system exception.
Read/Write
Marked as Read/Write, processes have the ability to store and retrieve from the memory storage region. This is the most common form of access.
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Default create method, creates a private block of read write shared memory of size aByteSize, sharing attributes default to owner.
Size | number of bytes to allocate |
Int | rights specificed |
References corelinux::FAIL_IF_EXISTS, corelinux::ScalarIdentifier< ScalarType >::getScalar(), and corelinux::Environment::setupCommonAccess().
Referenced by corelinux::SemaphoreCommon::SemaphoreCommon().
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static |
Create method, creates or opens a specifically identified block of shared memory of size aByteSize, sharing attributes default to owner.
MemoryIdentifier | reference to identifier. |
Size | number of bytes to allocate |
Int | rights specificed |
References corelinux::CREATE_OR_REUSE, corelinux::FAIL_IF_EXISTS, and corelinux::ScalarIdentifier< ScalarType >::getScalar().
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static |
Create method, creates or opens a specifically identified block of shared memory of size aByteSize, sharing attributes default to owner.
string | name of shared memory storage. |
Size | number of bytes to allocate |
Int | rights specificed |
References corelinux::CREATE_OR_REUSE, corelinux::FAIL_IF_EXISTS, corelinux::ScalarIdentifier< ScalarType >::getScalar(), and corelinux::Environment::setupCommonAccess().
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static |
Destroy a previously allocated storage block.
MemoryStorage | pointer to storage object |
References corelinux::ScalarIdentifier< ScalarType >::getScalar(), and corelinux::Environment::removeCommonAccess().
Referenced by corelinux::SemaphoreCommon::~SemaphoreCommon().