mongo::LockMongoFilesShared Class Reference

#include <mmap.h>

Public Member Functions
	LockMongoFilesShared (OperationContext *opCtx)

Static Public Member Functions
static void	assertExclusivelyLocked (OperationContext *opCtx)
static void	assertAtLeastReadLocked (OperationContext *opCtx)
static unsigned	getEra ()
	era changes anytime memory maps come and go. More...

Private Attributes
Lock::SharedLock	lk

Static Private Attributes
static Lock::ResourceMutex	mmmutex
static unsigned	era = 99

Friends
class	LockMongoFilesExclusive

Constructor & Destructor Documentation

LockMongoFilesShared()

mongo::LockMongoFilesShared::LockMongoFilesShared ( OperationContext *  opCtx )

inlineexplicit

Member Function Documentation

assertAtLeastReadLocked()

static void mongo::LockMongoFilesShared::assertAtLeastReadLocked ( OperationContext *  opCtx )

inlinestatic

assertExclusivelyLocked()

static void mongo::LockMongoFilesShared::assertExclusivelyLocked ( OperationContext *  opCtx )

inlinestatic

getEra()

static unsigned mongo::LockMongoFilesShared::getEra ( )

inlinestatic

era changes anytime memory maps come and go.

thus you can use this as a cheap way to check if nothing has changed since the last time you locked. Of course you must be shared locked at the time of this call, otherwise someone could be in progress.

This is used for yielding; see PageFaultException::touch().

Friends And Related Function Documentation

LockMongoFilesExclusive

friend class LockMongoFilesExclusive

friend

Member Data Documentation

era

unsigned mongo::LockMongoFilesShared::era = 99

staticprivate

lk

Lock::SharedLock mongo::LockMongoFilesShared::lk

private

mmmutex

Lock::ResourceMutex mongo::LockMongoFilesShared::mmmutex

staticprivate

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

• /home/louis/git/mongodbsource.github.io/src/src/mongo/db/storage/mmap_v1/mmap.h
• /home/louis/git/mongodbsource.github.io/src/src/mongo/db/storage/mmap_v1/mmap.cpp