Ipc::Mem::PagePool Class Reference

#include <PagePool.h>

Collaboration diagram for Ipc::Mem::PagePool:

Public Types
typedef Ipc::Mem::Owner< PageStack >	Owner

Public Member Functions
	PagePool (const char *const id)
unsigned int	capacity () const
size_t	pageSize () const
unsigned int	size () const
	lower bound for the number of free pages
size_t	level () const
	approximate number of shared memory pages used now
size_t	level (const int purpose) const
	approximate number of shared memory pages used now for given purpose
bool	get (const PageId::Purpose purpose, PageId &page)
	sets page ID and returns true unless no free pages are found
void	put (PageId &page)
	makes identified page available as a free page to future get() callers
char *	pagePointer (const PageId &page)
	converts page handler into a temporary writeable shared memory pointer

Static Public Member Functions
static Owner *	Init (const char *const shmId, const Ipc::Mem::PoolId stackId, const unsigned int capacity, const size_t pageSize)

Private Types
using	Levels_t = PageStack::Levels_t

Private Attributes
Ipc::Mem::Pointer< PageStack >	pageIndex
	free pages index
Levels_t *const	theLevels
	number of shared memory pages used now for each purpose
char *const	theBuf
	pages storage

Detailed Description

Atomic container of shared memory pages. Implemented using a collection of Segments, each with a PageStack index of free pages. All pools must be created by a single process.

Definition at line 25 of file PagePool.h.

Member Typedef Documentation

Levels_t

using Ipc::Mem::PagePool::Levels_t = PageStack::Levels_t

private

Definition at line 52 of file PagePool.h.

Owner

typedef Ipc::Mem::Owner<PageStack> Ipc::Mem::PagePool::Owner

Definition at line 28 of file PagePool.h.

Constructor & Destructor Documentation

PagePool()

Ipc::Mem::PagePool::PagePool

(

const char *const

id

)

Definition at line 29 of file PagePool.cc.

Member Function Documentation

capacity()

unsigned int Ipc::Mem::PagePool::capacity ( ) const

inline

Definition at line 34 of file PagePool.h.

References pageIndex.

Referenced by Init(), and level().

get()

bool Ipc::Mem::PagePool::get	(	const PageId::Purpose	purpose,
		PageId &	page
	)

Definition at line 46 of file PagePool.cc.

References Ipc::Mem::PageId::maxPurpose, Must, and Ipc::Mem::PageId::purpose.

Referenced by Ipc::Mem::GetPage().

Init()

Ipc::Mem::PagePool::Owner * Ipc::Mem::PagePool::Init ( const char *const  shmId, const Ipc::Mem::PoolId  stackId, const unsigned int  capacity, const size_t  pageSize  )

static

Definition at line 19 of file PagePool.cc.

References capacity(), Ipc::Mem::PageStack::Config::capacity, Ipc::Mem::PageStack::Config::createFull, pageSize(), Ipc::Mem::PageStack::Config::pageSize, Ipc::Mem::PageStack::Config::poolId, and shm_new.

Referenced by SharedMemPagesRr::create().

level() [1/2]

size_t Ipc::Mem::PagePool::level ( ) const

inline

Definition at line 39 of file PagePool.h.

References capacity(), and size().

Referenced by Ipc::Mem::PageLevel(), and Ipc::Mem::PageLevel().

level() [2/2]

size_t Ipc::Mem::PagePool::level

(

const int

purpose

)

const

Definition at line 39 of file PagePool.cc.

References Ipc::Mem::PageId::maxPurpose, and Must.

pagePointer()

char * Ipc::Mem::PagePool::pagePointer

(

const PageId &

page

)

Definition at line 70 of file PagePool.cc.

References Must, and Ipc::Mem::PageId::number.

Referenced by Ipc::Mem::PagePointer().

pageSize()

size_t Ipc::Mem::PagePool::pageSize ( ) const

inline

Definition at line 35 of file PagePool.h.

References pageIndex.

Referenced by Init().

put()

void Ipc::Mem::PagePool::put

(

PageId &

page

)

Definition at line 58 of file PagePool.cc.

References Ipc::Mem::PageId::maxPurpose, Must, and Ipc::Mem::PageId::purpose.

Referenced by Ipc::Mem::PutPage().

size()

unsigned int Ipc::Mem::PagePool::size ( ) const

inline

Definition at line 37 of file PagePool.h.

References pageIndex.

Referenced by level().

Member Data Documentation

pageIndex

Ipc::Mem::Pointer<PageStack> Ipc::Mem::PagePool::pageIndex

private

Definition at line 51 of file PagePool.h.

Referenced by capacity(), pageSize(), and size().

theBuf

char* const Ipc::Mem::PagePool::theBuf

private

Definition at line 56 of file PagePool.h.

theLevels

Levels_t* const Ipc::Mem::PagePool::theLevels

private

Definition at line 55 of file PagePool.h.

---

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

• squid/src/ipc/mem/PagePool.h
• squid/src/ipc/mem/PagePool.cc