diff options
Diffstat (limited to 'src/H5Cprivate.h')
| -rw-r--r-- | src/H5Cprivate.h | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/src/H5Cprivate.h b/src/H5Cprivate.h index 855c861..5d89313 100644 --- a/src/H5Cprivate.h +++ b/src/H5Cprivate.h @@ -378,6 +378,37 @@ typedef herr_t (*H5C_log_flush_func_t)(H5C_t * cache_ptr, * 'dest' callback routine. * * + * Fields supporting the 'flush dependency' feature: + * + * Entries in the cache may have a 'flush dependency' on another entry in the + * cache. A flush dependency requires that all dirty child entries be flushed + * to the file before a dirty parent entry (of those child entries) can be + * flushed to the file. This can be used by cache clients to create data + * structures that allow Single-Writer/Multiple-Reader (SWMR) access for the + * data structure. + * + * The leaf child entry will have a "height" of 0, with any parent entries + * having a height of 1 greater than the maximum height of any of their child + * entries (flush dependencies are allowed to create asymmetric trees of + * relationships). + * + * flush_dep_parent: Pointer to the parent entry for an entry in a flush + * dependency relationship. + * + * child_flush_dep_height_rc: An array of reference counts for child entries, + * where the number of children of each height is tracked. + * + * flush_dep_height: The height of the entry, which is one greater than the + * maximum height of any of its child entries.. + * + * pinned_from_client: Whether the entry was pinned by an explicit pin request + * from a cache client. + * + * pinned_from_cache: Whether the entry was pinned implicitly as a + * request of being a parent entry in a flush dependency + * relationship. + * + * * Fields supporting the hash table: * * Fields in the cache are indexed by a more or less conventional hash table. @@ -504,11 +535,13 @@ typedef struct H5C_cache_entry_t hbool_t destroy_in_progress; hbool_t free_file_space_on_destroy; - /* fields supporting the 'flush dependency height': */ + /* fields supporting the 'flush dependency' feature: */ struct H5C_cache_entry_t * flush_dep_parent; uint64_t child_flush_dep_height_rc[H5C__NUM_FLUSH_DEP_HEIGHTS]; unsigned flush_dep_height; + hbool_t pinned_from_client; + hbool_t pinned_from_cache; /* fields supporting the hash table: */ |