Ipc::Mem::Segment Class Reference

POSIX shared memory segment. More...

#include <Segment.h>

Collaboration diagram for Ipc::Mem::Segment:

Public Member Functions
	Segment (const char *const id)
	Create a shared memory segment. More...
	~Segment ()
void	create (const off_t aSize)
	Create a new shared memory segment. Unlinks the segment on destruction. More...
void	open (const bool unlinkWhenDone)
void *	reserve (size_t chunkSize)
	reserve and return the next chunk More...

Static Public Member Functions
static bool	Enabled ()
	Whether shared memory support is available. More...
static SBuf	Name (const SBuf &prefix, const char *suffix)
	concatenates parts of a name to form a complete name (or its prefix) More...

Static Public Attributes
static const char *	BasePath = DEFAULT_STATEDIR
	common path of all segment names in path-based environments More...

Private Member Functions
	Segment (const Segment &)
Segment &	operator= (const Segment &)
void	checkSupport (const char *const context)

Private Attributes
const String	theName
	shared memory segment file name More...
void *	theMem
	pointer to mmapped shared memory segment More...
off_t	theSize
	shared memory segment size More...
off_t	theReserved
	the total number of reserve()d bytes More...
bool	doUnlink
	whether the segment should be unlinked on destruction More...

Detailed Description

Definition at line 23 of file Segment.h.

Constructor & Destructor Documentation

Segment() [1/2]

Ipc::Mem::Segment::Segment

(

const char *const

id

)

Definition at line 306 of file Segment.cc.

~Segment()

Ipc::Mem::Segment::~Segment

(

)

Definition at line 311 of file Segment.cc.

References debugs, and Segments.

Segment() [2/2]

Ipc::Mem::Segment::Segment ( const Segment &  )

private

Member Function Documentation

checkSupport()

void Ipc::Mem::Segment::checkSupport ( const char *const  context )

private

Definition at line 363 of file Segment.cc.

References debugs, and fatalf().

create()

void Ipc::Mem::Segment::create

(

const off_t

aSize

)

Definition at line 328 of file Segment.cc.

References assert, debugs, fatalf(), and Segments.

Enabled()

bool Ipc::Mem::Segment::Enabled ( )

static

Definition at line 322 of file Segment.cc.

References IamWorkerProcess(), and UsingSmp().

Referenced by MemStoreRr::finalizeConfig().

Name()

SBuf Ipc::Mem::Segment::Name ( const SBuf &  prefix, const char *  suffix  )

static

Definition at line 52 of file Segment.cc.

References SBuf::append().

Referenced by createOwner(), Rock::SwapDir::inodeMapPath(), Rock::Rebuild::Stats::Path(), StoreMapAnchorsId(), StoreMapFileNosId(), and StoreMapSlicesId().

open()

void Ipc::Mem::Segment::open

(

const bool

unlinkWhenDone

)

opens an existing shared memory segment

Parameters

unlinkWhenDone

whether to delete the segment on destruction

Definition at line 346 of file Segment.cc.

References assert, debugs, fatalf(), Segments, theMem, and theSize.

Referenced by Ipc::Mem::Object< Class >::Object().

operator=()

Segment& Ipc::Mem::Segment::operator= ( const Segment &  )

private

reserve()

void * Ipc::Mem::Segment::reserve

(

size_t

chunkSize

)

Definition at line 38 of file Segment.cc.

References assert, Must, theMem, theReserved, and theSize.

Referenced by Ipc::Mem::Owner< Ipc::MultiQueue::Metadata >::New().

Member Data Documentation

BasePath

const char * Ipc::Mem::Segment::BasePath = DEFAULT_STATEDIR

static

Definition at line 45 of file Segment.h.

doUnlink

bool Ipc::Mem::Segment::doUnlink

private

Definition at line 79 of file Segment.h.

theMem

void* Ipc::Mem::Segment::theMem

private

Definition at line 76 of file Segment.h.

Referenced by open(), and reserve().

theName

const String Ipc::Mem::Segment::theName

private

Definition at line 75 of file Segment.h.

theReserved

off_t Ipc::Mem::Segment::theReserved

private

Definition at line 78 of file Segment.h.

Referenced by reserve().

theSize

off_t Ipc::Mem::Segment::theSize

private

Definition at line 77 of file Segment.h.

Referenced by open(), and reserve().

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The documentation for this class was generated from the following files:

• src/ipc/mem/Segment.h
• src/ipc/mem/Segment.cc