cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc > Class Template Reference

Merged slab allocator (allocators for objects of the same size are merged together). More...

#include <slab_alloc>

Inheritance diagram for cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc >:

Collaboration diagram for cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc >:

Public Types
enum	{ object_size = Obj_size , slab_size = Slab_size , objects_per_slab = _A::objects_per_slab , max_free_slabs = Max_free }

Public Member Functions
void *	alloc () noexcept
	Allocate an object.
void	free (void *p) noexcept
	Free the given object (p).
unsigned	total_objects () const noexcept
	Get the total number of objects managed by the slab allocator.
unsigned	free_objects () const noexcept
	Get the number of free objects in the slab allocator.

Detailed Description

template<int Obj_size, int Slab_size = L4_PAGESIZE, int Max_free = 2, template< typename A > class Alloc = New_allocator>
class cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc >

Merged slab allocator (allocators for objects of the same size are merged together).

Template Parameters

Obj_size	The size of an object managed by the slab allocator.
Slab_size	The size of a slab.
Max_free	The maximum number of free slabs.
Alloc	The allocator for the slabs.

This slab allocator class is useful for merging slab allocators with the same parameters (equal Obj_size, Slab_size, Max_free, and Alloc parameters) together and share the overhead for the slab caches among all equal-sized objects.

Definition at line 399 of file slab_alloc.

Member Enumeration Documentation

anonymous enum

template<int Obj_size, int Slab_size = L4_PAGESIZE, int Max_free = 2, template< typename A > class Alloc = New_allocator>

anonymous enum

Enumerator
object_size	Size of an object.
slab_size	Size of a slab.
objects_per_slab	Number of objects per slab.
max_free_slabs	Maximum number of free slabs.

Definition at line 406 of file slab_alloc.

Member Function Documentation

alloc()

template<int Obj_size, int Slab_size = L4_PAGESIZE, int Max_free = 2, template< typename A > class Alloc = New_allocator>

void * cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc >::alloc ( )

inlinenoexcept

Allocate an object.

Note

The user is responsible for initializing the object.

Definition at line 423 of file slab_alloc.

References cxx::Base_slab< Obj_size, Slab_size, Max_free, Alloc >::alloc().

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free()

template<int Obj_size, int Slab_size = L4_PAGESIZE, int Max_free = 2, template< typename A > class Alloc = New_allocator>

void cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc >::free ( void *  p )

inlinenoexcept

Free the given object (p).

Parameters

p	The pointer to the object to free.

Precondition

p must be a pointer to an object allocated by this allocator.

Definition at line 431 of file slab_alloc.

References cxx::Base_slab< Obj_size, Slab_size, Max_free, Alloc >::free().

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free_objects()

template<int Obj_size, int Slab_size = L4_PAGESIZE, int Max_free = 2, template< typename A > class Alloc = New_allocator>

unsigned cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc >::free_objects ( ) const

inlinenoexcept

Get the number of free objects in the slab allocator.

Returns

The number of free objects in all free and partially used slabs managed by this allocator.

Note

The value is the merged value for all equal parameterized Base_slab_static instances.

Definition at line 451 of file slab_alloc.

References cxx::Base_slab< Obj_size, Slab_size, Max_free, Alloc >::free_objects().

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total_objects()

template<int Obj_size, int Slab_size = L4_PAGESIZE, int Max_free = 2, template< typename A > class Alloc = New_allocator>

unsigned cxx::Base_slab_static< Obj_size, Slab_size, Max_free, Alloc >::total_objects ( ) const

inlinenoexcept

Get the total number of objects managed by the slab allocator.

Returns

The number of objects managed by the allocator (including the free objects).

Note

The value is the merged value for all equal parameterized Base_slab_static instances.

Definition at line 441 of file slab_alloc.

References cxx::Base_slab< Obj_size, Slab_size, Max_free, Alloc >::total_objects().

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

• l4/cxx/slab_alloc