diff options
Diffstat (limited to 'src/H5I.c')
| -rw-r--r-- | src/H5I.c | 104 |
1 files changed, 62 insertions, 42 deletions
@@ -349,33 +349,40 @@ H5I_destroy_group(H5I_type_t grp) FUNC_LEAVE(ret_value); } -/****************************************************************************** - NAME - H5I_register - Register an object in a group and get an ID for it. - - DESCRIPTION - Registers an object in a group and returns an ID for it. This routine - does _not_ check for unique-ness of the objects, if you register an object - twice, you will get two different IDs for it. This routine does make - certain that each ID in a group is unique. IDs are created by getting - a unique number for the group the ID is in and incorporating the group - into the ID which is returned to the user. - - RETURNS - Returns ID if successful and FAIL otherwise - -*******************************************************************************/ + +/*------------------------------------------------------------------------- + * Function: H5I_register + * + * Purpose: Registers an OBJECT in a GROUP and returns an ID for it. + * This routine does _not_ check for unique-ness of the objects, + * if you register an object twice, you will get two different + * IDs for it. This routine does make certain that each ID in a + * group is unique. IDs are created by getting a unique number + * for the group the ID is in and incorporating the group into + * the ID which is returned to the user. + * + * Return: Success: New object id. + * + * Failure: FAIL + * + * Programmer: Unknown + * + * Modifications: + * + *------------------------------------------------------------------------- + */ hid_t -H5I_register(H5I_type_t grp, /* IN: Group to register the object in */ - void *object /* IN: Object to attach to atom */ -) +H5I_register(H5I_type_t grp, void *object) { - H5I_id_group_t *grp_ptr = NULL; /* ptr to the group */ - H5I_id_info_t *id_ptr = NULL; /* ptr to the new ID information */ - hid_t new_id; /* new ID */ - uintn hash_loc; /* new item's hash table location */ - hid_t ret_value = SUCCEED; - + H5I_id_group_t *grp_ptr=NULL; /*ptr to the group */ + H5I_id_info_t *id_ptr=NULL; /*ptr to the new ID information */ + hid_t new_id; /*new ID */ + uintn hash_loc; /*new item's hash table location*/ + hid_t next_id; /*next ID to check */ + hid_t ret_value=SUCCEED; /*return value */ + H5I_id_info_t *curr_id; /*ptr to the current atom */ + uintn i; /*counter */ + FUNC_ENTER(H5I_register, FAIL); if (grp <= H5I_BADID || grp >= H5I_MAXID) @@ -410,32 +417,45 @@ H5I_register(H5I_type_t grp, /* IN: Group to register the object in */ * wrapping around, thus necessitating checking for duplicate IDs being * handed out. */ - if (grp_ptr->nextid > (uintn) ID_MASK || grp_ptr->wrapped != 0) { - if (grp_ptr->wrapped == 0) { - /* set the "wrapped around" flag if it isn't already */ - grp_ptr->wrapped = 1; - /* re-start the ID counter */ - grp_ptr->nextid = grp_ptr->reserved; - } - - do { + if (grp_ptr->nextid > (uintn)ID_MASK) { + grp_ptr->wrapped = 1; + grp_ptr->nextid = grp_ptr->reserved; + } + + /* + * If we've wrapped around then we need to check for duplicate id's being + * handed out. + */ + if (grp_ptr->wrapped) { + + /* + * Make sure we check all available ID's. If we're about at the end + * of the range then wrap around and check the beginning values. If + * we check all possible values and didn't find any free ones *then* + * we can fail. + */ + for (i=grp_ptr->reserved; i<ID_MASK; i++) { + + /* Handle end of range by wrapping to beginning */ + if (grp_ptr->nextid>(uintn)ID_MASK) { + grp_ptr->nextid = grp_ptr->reserved; + } + /* new ID to check for */ - hid_t next_id = H5I_MAKE(grp, grp_ptr->nextid); - H5I_id_info_t *curr_id; /* ptr to the current atom */ + next_id = H5I_MAKE(grp, grp_ptr->nextid); hash_loc = H5I_LOC (grp_ptr->nextid, grp_ptr->hash_size); - curr_id = grp_ptr->id_list[hash_loc]; if (curr_id == NULL) break; /* Ha! this is not likely... */ - while (curr_id != NULL) { + while (curr_id) { if (curr_id->id == next_id) break; curr_id = curr_id->next; } - if (curr_id == NULL) break; /* must not have found a match */ + if (!curr_id) break; /* must not have found a match */ grp_ptr->nextid++; - } while (grp_ptr->nextid <= (uintn) ID_MASK); - - if (grp_ptr->nextid > (uintn) ID_MASK) { + } + + if (i>=(uintn)ID_MASK) { /* All the IDs are gone! */ HGOTO_DONE(FAIL); } |