#include "le_singlyLinkedList.h"

Data Structures
struct	le_mem_Pool_t

struct	le_mem_PoolStats_t

Macros
#define	LE_COMPONENT_NAME

#define	LE_MEM_LIMIT_MAX_MEM_POOL_NAME_BYTES 32

Typedefs
typedef void(*	le_mem_Destructor_t) (void *objPtr)

typedef struct le_mem_Pool *	le_mem_PoolRef_t

Functions
static le_mem_PoolRef_t	le_mem_CreatePool (const char *name, size_t objSize)

le_mem_PoolRef_t	le_mem_ExpandPool (le_mem_PoolRef_t pool, size_t numObjects)

void *	le_mem_TryAlloc (le_mem_PoolRef_t pool)

void *	le_mem_AssertAlloc (le_mem_PoolRef_t pool)

void *	le_mem_ForceAlloc (le_mem_PoolRef_t pool)

void *	le_mem_TryVarAlloc (le_mem_PoolRef_t pool, size_t size)

void *	le_mem_AssertVarAlloc (le_mem_PoolRef_t pool, size_t size)

void *	le_mem_ForceVarAlloc (le_mem_PoolRef_t pool, size_t size)

void	le_mem_SetNumObjsToForce (le_mem_PoolRef_t pool, size_t numObjects)

void	le_mem_Release (void *objPtr)

void	le_mem_AddRef (void *objPtr)

size_t	le_mem_GetBlockSize (void *objPtr)

size_t	le_mem_GetRefCount (void *objPtr)

void	le_mem_SetDestructor (le_mem_PoolRef_t pool, le_mem_Destructor_t destructor)

void	le_mem_GetStats (le_mem_PoolRef_t pool, le_mem_PoolStats_t *statsPtr)

void	le_mem_ResetStats (le_mem_PoolRef_t pool)

le_result_t	le_mem_GetName (le_mem_PoolRef_t pool, char *namePtr, size_t bufSize)

bool	le_mem_IsSubPool (le_mem_PoolRef_t pool)

size_t	le_mem_GetObjectCount (le_mem_PoolRef_t pool)

size_t	le_mem_GetObjectSize (le_mem_PoolRef_t pool)

size_t	le_mem_GetObjectFullSize (le_mem_PoolRef_t pool)

static le_mem_PoolRef_t	le_mem_FindPool (const char *name)

static le_mem_PoolRef_t	le_mem_CreateSubPool (le_mem_PoolRef_t superPool, const char *name, size_t numObjects)

static le_mem_PoolRef_t	le_mem_CreateReducedPool (le_mem_PoolRef_t superPool, const char *name, size_t numObjects, size_t objSize)

void	le_mem_DeleteSubPool (le_mem_PoolRef_t subPool)

void	le_mem_InitHibernation (void startPtr, void endPtr)

void	le_mem_Hibernate (void freeStartPtr, void freeEndPtr)

void	le_mem_Resume (void)

char *	le_mem_StrDup (le_mem_PoolRef_t poolRef, const char *srcStr)

Detailed Description

Legato Dynamic Memory Allocation API include file.

Copyright (C) Sierra Wireless Inc.

Typedef Documentation

◆ le_mem_Destructor_t

typedef void(* le_mem_Destructor_t) (void *objPtr)

Prototype for destructor functions.

Parameters

objPtr Pointer to the object where reference count has reached zero. After the destructor returns this object's memory will be released back into the pool (and this pointer will become invalid).

Returns: Nothing.

See Destructors for more information.

◆ le_mem_PoolRef_t

typedef struct le_mem_Pool* le_mem_PoolRef_t

Objects of this type are used to refer to a memory pool created using either le_mem_CreatePool() or le_mem_CreateSubPool().

Function Documentation

◆ le_mem_AddRef()

void le_mem_AddRef ( void * objPtr )

Increments the reference count on an object by 1.

See Reference Counting for more information.

Returns: Nothing.

Parameters

[in] objPtr Pointer to the object.

◆ le_mem_AssertAlloc()

void* le_mem_AssertAlloc ( le_mem_PoolRef_t pool )

Allocates an object from a pool or logs a fatal error and terminates the process if the pool doesn't have any free objects to allocate.

Returns: Pointer to the allocated object.

Note: On failure, the process exits, so you don't have to worry about checking the returned pointer for validity.

Parameters

[in] pool Pool from which the object is to be allocated.

◆ le_mem_AssertVarAlloc()

void* le_mem_AssertVarAlloc	(	le_mem_PoolRef_t	pool,
		size_t	size
	)

Allocates an object from a pool or logs a fatal error and terminates the process if the pool doesn't have any free objects to allocate.

Returns: Pointer to the allocated object.

Note: On failure, the process exits, so you don't have to worry about checking the returned pointer for validity.

Parameters

[in]	pool	Pool from which the object is to be allocated.
[in]	size	The size of block to allocate

◆ le_mem_CreatePool()

LE_DECLARE_INLINE le_mem_PoolRef_t le_mem_CreatePool	(	const char *	name,
		size_t	objSize
	)

inlinestatic

Creates an empty memory pool.

Returns: Reference to the memory pool object.

Note: On failure, the process exits, so you don't have to worry about checking the returned reference for validity.

Parameters

[in]	name	Name of the pool inside the component.
[in]	objSize	Size of the individual objects to be allocated from this pool (in bytes), e.g., sizeof(MyObject_t).

◆ le_mem_CreateReducedPool()

LE_DECLARE_INLINE le_mem_PoolRef_t le_mem_CreateReducedPool	(	le_mem_PoolRef_t	superPool,
		const char *	name,
		size_t	numObjects,
		size_t	objSize
	)

inlinestatic

Creates a sub-pool of smaller objects.

See Reduced-size pools for more information.

Returns: Reference to the sub-pool.

Parameters

[in]	superPool	Super-pool.
[in]	name	Name of the sub-pool (will be copied into the sub-pool).
[in]	numObjects	Minimum number of objects in the subpool by default.
[in]	objSize	Minimum size of objects in the subpool.

◆ le_mem_CreateSubPool()

LE_DECLARE_INLINE le_mem_PoolRef_t le_mem_CreateSubPool	(	le_mem_PoolRef_t	superPool,
		const char *	name,
		size_t	numObjects
	)

inlinestatic

Creates a sub-pool.

See Sub-Pools for more information.

Returns: Reference to the sub-pool.

Parameters

[in]	superPool	Super-pool.
[in]	name	Name of the sub-pool (will be copied into the sub-pool).
[in]	numObjects	Number of objects to take from the super-pool.

◆ le_mem_DeleteSubPool()

void le_mem_DeleteSubPool ( le_mem_PoolRef_t subPool )

Deletes a sub-pool.

See Sub-Pools for more information.

Returns: Nothing.

Parameters

[in] subPool Sub-pool to be deleted.

◆ le_mem_ExpandPool()

le_mem_PoolRef_t le_mem_ExpandPool	(	le_mem_PoolRef_t	pool,
		size_t	numObjects
	)

Expands the size of a memory pool.

Returns: Reference to the memory pool object (the same value passed into it).

Note: On failure, the process exits, so you don't have to worry about checking the returned reference for validity.

Parameters

[in]	pool	Pool to be expanded.
[in]	numObjects	Number of objects to add to the pool.

◆ le_mem_FindPool()

LE_DECLARE_INLINE le_mem_PoolRef_t le_mem_FindPool ( const char * name )

inlinestatic

Finds a pool based on the pool's name.

Returns: Reference to the pool, or NULL if the pool doesn't exist.

Parameters

[in] name Name of the pool inside the component.

◆ le_mem_ForceAlloc()

void* le_mem_ForceAlloc ( le_mem_PoolRef_t pool )

Allocates an object from a pool or logs a warning and expands the pool if the pool doesn't have any free objects to allocate.

Returns: Pointer to the allocated object.

Note: On failure, the process exits, so you don't have to worry about checking the returned pointer for validity.

Parameters

[in] pool Pool from which the object is to be allocated.

◆ le_mem_ForceVarAlloc()

void* le_mem_ForceVarAlloc	(	le_mem_PoolRef_t	pool,
		size_t	size
	)

Allocates an object from a pool or logs a warning and expands the pool if the pool doesn't have any free objects to allocate.

Returns: Pointer to the allocated object.

Note: On failure, the process exits, so you don't have to worry about checking the returned pointer for validity.

Parameters

[in]	pool	Pool from which the object is to be allocated.
[in]	size	The size of block to allocate

◆ le_mem_GetBlockSize()

size_t le_mem_GetBlockSize ( void * objPtr )

Fetches the size of a block (in bytes).

Returns: Object size, in bytes.

Parameters

[in] objPtr Pointer to the object to get size of.

◆ le_mem_GetName()

le_result_t le_mem_GetName	(	le_mem_PoolRef_t	pool,
		char *	namePtr,
		size_t	bufSize
	)

Gets the memory pool's name, including the component name prefix.

If the pool were given the name "myPool" and the component that it belongs to is called "myComponent", then the full pool name returned by this function would be "myComponent.myPool".

Returns: LE_OK if successful. LE_OVERFLOW if the name was truncated to fit in the provided buffer.

Parameters

[in]	pool	The memory pool.
[out]	namePtr	Buffer to store the name of the memory pool.
[in]	bufSize	Size of the buffer namePtr points to.

◆ le_mem_GetObjectCount()

size_t le_mem_GetObjectCount ( le_mem_PoolRef_t pool )

Fetches the number of objects a specified pool can hold (this includes both the number of free and in-use objects).

Returns: Total number of objects.

Parameters

[in] pool Pool where number of objects is to be fetched.

◆ le_mem_GetObjectFullSize()

size_t le_mem_GetObjectFullSize ( le_mem_PoolRef_t pool )

Fetches the total size of the object including all the memory overhead in a given pool (in bytes).

Returns: Total object memory size, in bytes.

Parameters

[in] pool The pool whose object memory size is to be fetched.

◆ le_mem_GetObjectSize()

size_t le_mem_GetObjectSize ( le_mem_PoolRef_t pool )

Fetches the size of the objects in a specified pool (in bytes).

Returns: Object size, in bytes.

Parameters

[in] pool Pool where object size is to be fetched.

◆ le_mem_GetRefCount()

size_t le_mem_GetRefCount ( void * objPtr )

Fetches the reference count on an object.

See Reference Counting for more information.

Warning: If using this in a multi-threaded application that shares memory pool objects between threads, steps must be taken to coordinate the threads (e.g., using a mutex) to ensure that the reference count value fetched remains correct when it is used.

Returns: The reference count on the object.

Parameters

[in] objPtr Pointer to the object.

◆ le_mem_GetStats()

void le_mem_GetStats	(	le_mem_PoolRef_t	pool,
		le_mem_PoolStats_t *	statsPtr
	)

Fetches the statistics for a specified pool.

Returns: Nothing. Uses output parameter instead.

Parameters

[in]	pool	Pool where stats are to be fetched.
[out]	statsPtr	Pointer to where the stats will be stored.

◆ le_mem_Hibernate()

void le_mem_Hibernate	(	void **	freeStartPtr,
		void **	freeEndPtr
	)

Compress memory pools ready for hibernate-to-RAM

This compresses the memory pools ready for hibernation. All Legato tasks must remain suspended until after le_mem_Resume() is called.

Returns: Nothing

Parameters

[out]	freeStartPtr	Beginning of unused memory which does not need to be preserved in hibernation
[out]	freeEndPtr	End of unused memory

◆ le_mem_InitHibernation()

void le_mem_InitHibernation	(	void *	startPtr,
		void *	endPtr
	)

Prepare system to support hibernate-to-memory.

Parameters

[in]	startPtr	Beginning of memory pool region
[in]	endPtr	End of memory pool region

◆ le_mem_IsSubPool()

bool le_mem_IsSubPool ( le_mem_PoolRef_t pool )

Checks if the specified pool is a sub-pool.

Returns: true if it is a sub-pool. false if it is not a sub-pool.

Parameters

[in] pool The memory pool.

◆ le_mem_Release()

void le_mem_Release ( void * objPtr )

Releases an object. If the object's reference count has reached zero, it will be destructed and its memory will be put back into the pool for later reuse.

Returns: Nothing.

Warning

Don't EVER access an object after releasing it. It might not exist anymore.
If the object has a destructor accessing a data structure shared by multiple threads, ensure you hold the mutex (or take other measures to prevent races) before releasing the object.

Parameters

[in] objPtr Pointer to the object to be released.

◆ le_mem_ResetStats()

void le_mem_ResetStats ( le_mem_PoolRef_t pool )

Resets the statistics for a specified pool.

Returns: Nothing.

Parameters

[in] pool Pool where stats are to be reset.

◆ le_mem_Resume()

void le_mem_Resume ( void )

Decompress memory pools after waking from hibernate-to-RAM

This decompresses memory pools after hibernation. After this function returns, Legato tasks may be resumed.

Returns: Nothing

◆ le_mem_SetDestructor()

void le_mem_SetDestructor	(	le_mem_PoolRef_t	pool,
		le_mem_Destructor_t	destructor
	)

Sets the destructor function for a specified pool.

See Destructors for more information.

Returns: Nothing.

Parameters

[in]	pool	The pool.
[in]	destructor	Destructor function.

◆ le_mem_SetNumObjsToForce()

void le_mem_SetNumObjsToForce	(	le_mem_PoolRef_t	pool,
		size_t	numObjects
	)

Sets the number of objects that are added when le_mem_ForceAlloc expands the pool.

Returns: Nothing.

Note: The default value is one.

Parameters

[in]	pool	Pool to set the number of objects for.
[in]	numObjects	Number of objects that is added when le_mem_ForceAlloc expands the pool.

◆ le_mem_StrDup()

char* le_mem_StrDup	(	le_mem_PoolRef_t	poolRef,
		const char *	srcStr
	)

Duplicate a UTF-8 string. The space for the duplicate string will be allocated from the provided memory pool using le_mem_VarAlloc().

Returns: The allocated duplicate of the string. This may later be released with le_mem_Release().

Parameters

poolRef	Pool from which to allocate the string.
srcStr	String to duplicate.

◆ le_mem_TryAlloc()

void* le_mem_TryAlloc ( le_mem_PoolRef_t pool )

Attempts to allocate an object from a pool.

Returns: Pointer to the allocated object, or NULL if the pool doesn't have any free objects to allocate.

Parameters

[in] pool Pool from which the object is to be allocated.

◆ le_mem_TryVarAlloc()

void* le_mem_TryVarAlloc	(	le_mem_PoolRef_t	pool,
		size_t	size
	)

Attempts to allocate an object from a pool.

Returns: Pointer to the allocated object, or NULL if the pool doesn't have any free objects to allocate.

Parameters

[in]	pool	Pool from which the object is to be allocated.
[in]	size	The size of block to allocate

/ Reference

le_mem.h File Reference

Data Structures

Macros

Typedefs

Functions

Detailed Description

Typedef Documentation

◆ le_mem_Destructor_t

◆ le_mem_PoolRef_t

Function Documentation

◆ le_mem_AddRef()

◆ le_mem_AssertAlloc()

◆ le_mem_AssertVarAlloc()

◆ le_mem_CreatePool()

◆ le_mem_CreateReducedPool()

◆ le_mem_CreateSubPool()

◆ le_mem_DeleteSubPool()

◆ le_mem_ExpandPool()

◆ le_mem_FindPool()

◆ le_mem_ForceAlloc()

◆ le_mem_ForceVarAlloc()

◆ le_mem_GetBlockSize()

◆ le_mem_GetName()

◆ le_mem_GetObjectCount()

◆ le_mem_GetObjectFullSize()

◆ le_mem_GetObjectSize()

◆ le_mem_GetRefCount()

◆ le_mem_GetStats()

◆ le_mem_Hibernate()

◆ le_mem_InitHibernation()

◆ le_mem_IsSubPool()

◆ le_mem_Release()

◆ le_mem_ResetStats()

◆ le_mem_Resume()

◆ le_mem_SetDestructor()

◆ le_mem_SetNumObjsToForce()

◆ le_mem_StrDup()

◆ le_mem_TryAlloc()

◆ le_mem_TryVarAlloc()