cds::memory::michael::Heap< Options >::block_header Class Reference

Allocated block header. More...

#include <cds/memory/michael/allocator.h>

Detailed Description

template<typename... Options>
class cds::memory::michael::Heap< Options >::block_header

Allocated block header.

Each allocated block has 8-byte header. The header contains pointer to owner superblock descriptor and the redirection flag. If the block has been allocated by alloc, then the redirection flag is 0 and the block's structure is:

+---------------+
| blockHeader   |   [8 byte] pointer to owner superblock (flag=0)
+---------------+
|               | <- memory allocated
|   memory      |
|               |
+---------------+

If the block has been allocated by alloc_aligned, then it is possible that pointer returned must be aligned. In this case the redirection flag is 1 and the block's structure is:

    +---------------+
+-> | blockHeader   |   [8 byte] pointer to owner superblock (flag=0)
|   +---------------+
|   |   padding     |
|   |   (unused)    |
|   |               |
|   +---------------+
+-- | blockHeader   |   [8 byte] pointer to block head (flag=1)
    +---------------+
    |               | <- memory allocated
    |   memory      |
    |               |
    +---------------+

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

• cds/memory/michael/allocator.h