Defined in header
size bytes of uninitialized storage whose alignment is specified by
size parameter must be an integral multiple of
aligned_alloc is thread-safe: it behaves as though only accessing the memory locations visible through its argument, and not any static storage.
A previous call to free or realloc that deallocates a region of memory synchronizes-with a call to aligned_alloc that allocates the same or a part of the same region of memory. This synchronization occurs after any access to the memory by the deallocating function and before any access to the memory by
|alignment||-||specifies the alignment. Must be a valid alignment supported by the implementation.|
|size||-|| number of bytes to allocate. An integral multiple of
 Return value
Either a null pointer or a pointer to the allocated memory. The pointer must be deallocated with free().
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.
E.g., the glibc requires
alignment to be a power of two and a multiple of
- C11 standard (ISO/IEC 9899:2011):
- 188.8.131.52 Memory management functions
 See also
C++ documentation for aligned storage