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aligned_alloc

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< c‎ | memory
Revision as of 08:51, 24 October 2013 by P12 (Talk | contribs)

Defined in header <stdlib.h>
void *aligned_alloc( size_t alignment, size_t size );
(since C11)

Allocate size bytes of uninitialized storage whose alignment is specified by alignment. The size parameter should be an integral multiple of alignment.

Contents

Parameters

alignment - specifies the alignment. Shall be a valid alignment supported by the implementation.
size - number of bytes to allocate. An integral multiple of alignment

Return value

Either a NULL pointer or a pointer to the allocated memory. The pointer must be deallocated with free().

Notes

Passing a size which is not an integral multiple of alignment or a alignment which is not valid or not supported by the implementation is undefined behavior (See J.2 in C11).

E.g., the glibc requires alignment to be a power of two and a multiple of sizeof(void *).

References

  • C11 standard (ISO/IEC 9899:2011):
  • 7.22.3.1 Memory management functions

See also

C++ documentation for aligned storage