sstmac::sw::stack_alloc Class Reference

A management type to handle dividing mmap-ed memory for use as ucontext stack(s). More...

#include <stack_alloc.h>

Collaboration diagram for sstmac::sw::stack_alloc:

Classes
class	chunk
	A chunk of allocated memory to be divided into fixed-size stacks. More...

Public Member Functions
	stack_alloc ()
	Build. More...
size_t	stacksize () const
bool	use_mprot () const
size_t	chunksize () const
virtual	~stack_alloc ()
	Goodbye. More...
void *	alloc ()
	Get a stack memory region. More...
void	free (void *)
	Return the given memory region. More...
void	init (size_t stacksize, size_t alloc_unit, bool use_mprot)
bool	initialized () const
void	clear ()

Private Types
typedef std::vector< chunk * >	chunk_vec_t
	This is where we store the memory regions. More...
typedef std::vector< void * >	available_vec_t
	This is our list of un-allocated chunks: More...

Private Attributes
chunk_vec_t	chunks_
size_t	suggested_chunk_
	Each chunk is of this suggested size. More...
size_t	stacksize_
	Each stack request is of this size: More...
bool	use_mprot_
	Do we want stacks separated by an mprot region? More...
available_vec_t	available_

Detailed Description

A management type to handle dividing mmap-ed memory for use as ucontext stack(s).

This is basically a very simple malloc which allocates uniform-size chunks (with the NX bit unset) and sets guard pages on each side of the allocated stacks.

This allocator does not return memory to the system until it is deleted, but regions can be allocated and free-d repeatedly.

Definition at line 30 of file stack_alloc.h.

Member Typedef Documentation

typedef std::vector<void*> sstmac::sw::stack_alloc::available_vec_t

private

This is our list of un-allocated chunks:

Definition at line 46 of file stack_alloc.h.

typedef std::vector<chunk*> sstmac::sw::stack_alloc::chunk_vec_t

private

This is where we store the memory regions.

Definition at line 34 of file stack_alloc.h.

Constructor & Destructor Documentation

sstmac::sw::stack_alloc::stack_alloc

(

)

Build.

virtual sstmac::sw::stack_alloc::~stack_alloc ( )

virtual

Goodbye.

Referenced by chunksize().

Member Function Documentation

void* sstmac::sw::stack_alloc::alloc

(

)

Get a stack memory region.

Referenced by chunksize().

size_t sstmac::sw::stack_alloc::chunksize ( ) const

inline

Definition at line 64 of file stack_alloc.h.

References alloc(), free(), init(), stacksize(), suggested_chunk_, use_mprot(), and ~stack_alloc().

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void sstmac::sw::stack_alloc::clear

(

)

Referenced by initialized().

void sstmac::sw::stack_alloc::free

(

void *

)

Return the given memory region.

Referenced by chunksize().

void sstmac::sw::stack_alloc::init	(	size_t	stacksize,
		size_t	alloc_unit,
		bool	use_mprot
	)

Referenced by chunksize().

bool sstmac::sw::stack_alloc::initialized ( ) const

inline

Definition at line 80 of file stack_alloc.h.

References clear(), and stacksize_.

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size_t sstmac::sw::stack_alloc::stacksize ( ) const

inline

Definition at line 54 of file stack_alloc.h.

References stacksize_.

Referenced by chunksize().

bool sstmac::sw::stack_alloc::use_mprot ( ) const

inline

Definition at line 59 of file stack_alloc.h.

References use_mprot_.

Referenced by chunksize().

Member Data Documentation

available_vec_t sstmac::sw::stack_alloc::available_

private

Definition at line 47 of file stack_alloc.h.

chunk_vec_t sstmac::sw::stack_alloc::chunks_

private

Definition at line 37 of file stack_alloc.h.

size_t sstmac::sw::stack_alloc::stacksize_

private

Each stack request is of this size:

Definition at line 41 of file stack_alloc.h.

Referenced by initialized(), and stacksize().

size_t sstmac::sw::stack_alloc::suggested_chunk_

private

Each chunk is of this suggested size.

Definition at line 39 of file stack_alloc.h.

Referenced by chunksize().

bool sstmac::sw::stack_alloc::use_mprot_

private

Do we want stacks separated by an mprot region?

Definition at line 43 of file stack_alloc.h.

Referenced by use_mprot().

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

• sstmac/software/threading/stack_alloc.h