LockedPoolManager Class Reference

Singleton class to keep track of locked (ie, non-swappable) memory, for use in std::allocator templates. More...

#include <lockedpool.h>

Inheritance diagram for LockedPoolManager:

Collaboration diagram for LockedPoolManager:

Static Public Member Functions
static LockedPoolManager &	Instance ()
	Return the current instance, or create it once. More...

Private Member Functions
	LockedPoolManager (std::unique_ptr< LockedPageAllocator > allocator)

Static Private Member Functions
static void	CreateInstance ()
	Create a new LockedPoolManager specialized to the OS. More...
static bool	LockingFailed ()
	Called when locking fails, warn the user here. More...

Static Private Attributes
static LockedPoolManager *	_instance = nullptr
static std::once_flag	init_flag

Additional Inherited Members
Public Types inherited from LockedPool
typedef bool(*	LockingFailed_Callback) ()
	Callback when allocation succeeds but locking fails. More...
Public Member Functions inherited from LockedPool
	LockedPool (std::unique_ptr< LockedPageAllocator > allocator, LockingFailed_Callback lf_cb_in=nullptr)
	Create a new LockedPool. More...
	~LockedPool ()
	LockedPool (const LockedPool &other)=delete
LockedPool &	operator= (const LockedPool &)=delete
void *	alloc (size_t size)
	Allocate size bytes from this arena. More...
void	free (void *ptr)
	Free a previously allocated chunk of memory. More...
Stats	stats () const
	Get pool usage statistics. More...
Static Public Attributes inherited from LockedPool
static const size_t	ARENA_SIZE = 256*1024
	Size of one arena of locked memory. More...
static const size_t	ARENA_ALIGN = 16
	Chunk alignment. More...

Detailed Description

Singleton class to keep track of locked (ie, non-swappable) memory, for use in std::allocator templates.

Some implementations of the STL allocate memory in some constructors (i.e., see MSVC's vector<T> implementation where it allocates 1 byte of memory in the allocator.) Due to the unpredictable order of static initializers, we have to make sure the LockedPoolManager instance exists before any other STL-based objects that use secure_allocator are created. So instead of having LockedPoolManager also be static-initialized, it is created on demand.

Definition at line 218 of file lockedpool.h.

Constructor & Destructor Documentation

LockedPoolManager()

LockedPoolManager::LockedPoolManager ( std::unique_ptr< LockedPageAllocator >  allocator )

explicitprivate

Definition at line 380 of file lockedpool.cpp.

Member Function Documentation

CreateInstance()

void LockedPoolManager::CreateInstance ( )

staticprivate

Create a new LockedPoolManager specialized to the OS.

Definition at line 391 of file lockedpool.cpp.

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Instance()

static LockedPoolManager& LockedPoolManager::Instance ( )

inlinestatic

Return the current instance, or create it once.

Definition at line 222 of file lockedpool.h.

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LockingFailed()

bool LockedPoolManager::LockingFailed ( )

staticprivate

Called when locking fails, warn the user here.

Definition at line 385 of file lockedpool.cpp.

Member Data Documentation

_instance

LockedPoolManager * LockedPoolManager::_instance = nullptr

staticprivate

Definition at line 236 of file lockedpool.h.

init_flag

std::once_flag LockedPoolManager::init_flag

staticprivate

Definition at line 237 of file lockedpool.h.

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

• src/support/lockedpool.h
• src/support/lockedpool.cpp