OS_Memory.h File Reference

#include "ace/OS_Errno.h"
#include "ace/Basic_Types.h"
#include "ace/os_include/os_stddef.h"
#include "ace/OS_NS_stdlib.h"

Include dependency graph for OS_Memory.h:

Defines
#define	ACE_MALLOC_FUNC   ::malloc
#define	ACE_CALLOC_FUNC   ::calloc
#define	ACE_FREE_FUNC   ::free
#define	ACE_REALLOC_FUNC   ::realloc
#define	ACE_del_bad_alloc
#define	ACE_NEW_RETURN(POINTER, CONSTRUCTOR, RET_VAL)
#define	ACE_NEW(POINTER, CONSTRUCTOR)
#define	ACE_NEW_NORETURN(POINTER, CONSTRUCTOR)
#define	ACE_throw_bad_alloc
Functions
Efficiently compute aligned pointers to powers of 2 boundaries.
uintptr_t	ACE_align_binary (uintptr_t ptr, uintptr_t alignment)
	Return the next integer aligned to a required boundary.
char *	ACE_ptr_align_binary (char const *ptr, uintptr_t alignment)
	Return the next address aligned to a required boundary.
char *	ACE_ptr_align_binary (unsigned char const *ptr, uintptr_t alignment)
	Return the next address aligned to a required boundary.
Variables
ACE_BEGIN_VERSIONED_NAMESPACE_DECL typedef void *	ACE_MALLOC_T

---

Detailed Description

Id

OS_Memory.h 80826 2008-03-04 14:51:23Z wotte

Author:

Doug Schmidt <schmidt@cs.wustl.edu>

Jesper S. M|ller<stophph@diku.dk>

and a cast of thousands...

---

Define Documentation

#define ACE_CALLOC_FUNC   ::calloc

#define ACE_del_bad_alloc

#define ACE_FREE_FUNC   ::free

#define ACE_MALLOC_FUNC   ::malloc

#define ACE_NEW	(	POINTER,
		CONSTRUCTOR		)

Value:

do { POINTER = new CONSTRUCTOR; \
     if (POINTER == 0) { errno = ENOMEM; return; } \
   } while (0)

#define ACE_NEW_NORETURN	(	POINTER,
		CONSTRUCTOR		)

Value:

do { POINTER = new CONSTRUCTOR; \
     if (POINTER == 0) { errno = ENOMEM; } \
   } while (0)

#define ACE_NEW_RETURN	(	POINTER,
		CONSTRUCTOR,
		RET_VAL		)

Value:

do { POINTER = new CONSTRUCTOR; \
     if (POINTER == 0) { errno = ENOMEM; return RET_VAL; } \
   } while (0)

#define ACE_REALLOC_FUNC   ::realloc

#define ACE_throw_bad_alloc

Value:

void* gcc_will_complain_if_literal_0_is_returned = 0; \
  return gcc_will_complain_if_literal_0_is_returned

---

Function Documentation

uintptr_t ACE_align_binary	(	uintptr_t	ptr,
		uintptr_t	alignment
	)			[inline]

Return the next integer aligned to a required boundary.

Efficiently align "value" up to "alignment", knowing that all such boundaries are binary powers and that we're using two's complement arithmetic.

Since the alignment is a power of two its binary representation is:

alignment = 0...010...0

hence

alignment - 1 = 0...001...1 = T1

so the complement is:

~(alignment - 1) = 1...110...0 = T2

Notice that there is a multiple of <alignment> in the range [

,

+ T1], also notice that if

X = (

+ T1 ) & T2

then

<= X <=

+ T1

because the & operator only changes the last bits, and since X is a multiple of <alignment> (its last bits are zero) we have found the multiple we wanted.

Parameters:

	ptr	the base pointer
	alignment	the required alignment

char* ACE_ptr_align_binary	(	unsigned char const *	ptr,
		uintptr_t	alignment
	)			[inline]

Return the next address aligned to a required boundary.

char* ACE_ptr_align_binary	(	char const *	ptr,
		uintptr_t	alignment
	)			[inline]

Return the next address aligned to a required boundary.

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Variable Documentation

ACE_BEGIN_VERSIONED_NAMESPACE_DECL typedef void* ACE_MALLOC_T