diff options
author | Costa Tsaousis <costa@netdata.cloud> | 2022-11-24 19:35:03 +0200 |
---|---|---|
committer | GitHub <noreply@github.com> | 2022-11-24 19:35:03 +0200 |
commit | 2327d2ba35ee76a5631fd67751ba4745945e5ec0 (patch) | |
tree | 4edb5f5e0834bd5d744db3d985497c05eba379d0 /libnetdata/dictionary | |
parent | a223f59ab3a3991ee79aa59f1dddb04e7ebf2eea (diff) |
fix dictionaries unittest (#14042)
dictionary unittest was giving errors because of a wrong flags; added pointer registry to dictionary to ensure that pointers are unique (internal checks only); added locks to dictionary destroy
Diffstat (limited to 'libnetdata/dictionary')
-rw-r--r-- | libnetdata/dictionary/dictionary.c | 135 |
1 files changed, 122 insertions, 13 deletions
diff --git a/libnetdata/dictionary/dictionary.c b/libnetdata/dictionary/dictionary.c index d3807ea515..c6b6b022f5 100644 --- a/libnetdata/dictionary/dictionary.c +++ b/libnetdata/dictionary/dictionary.c @@ -80,6 +80,10 @@ typedef struct dictionary_item_shared { struct dictionary_item { #ifdef NETDATA_INTERNAL_CHECKS DICTIONARY *dict; + pid_t creator_pid; + pid_t deleter_pid; + pid_t ll_adder_pid; + pid_t ll_remover_pid; #endif DICTIONARY_ITEM_SHARED *shared; @@ -169,6 +173,11 @@ struct dictionary { long int entries; // how many items are currently in the index (the linked list may have more) long int referenced_items; // how many items of the dictionary are currently being used by 3rd parties long int pending_deletion_items; // how many items of the dictionary have been deleted, but have not been removed yet + +#ifdef NETDATA_INTERNAL_CHECKS + netdata_mutex_t global_pointer_registry_mutex; + Pvoid_t global_pointer_registry; +#endif }; // forward definitions of functions used in reverse order in the code @@ -190,6 +199,60 @@ static int item_check_and_acquire_advanced(DICTIONARY *dict, DICTIONARY_ITEM *it #define item_is_not_referenced_and_can_be_removed(dict, item) (item_is_not_referenced_and_can_be_removed_advanced(dict, item) == RC_ITEM_OK) static inline int item_is_not_referenced_and_can_be_removed_advanced(DICTIONARY *dict, DICTIONARY_ITEM *item); +static inline void pointer_index_init(DICTIONARY *dict) { +#ifdef NETDATA_INTERNAL_CHECKS + netdata_mutex_init(&dict->global_pointer_registry_mutex); +#else + ; +#endif +} + +static inline void pointer_destroy_index(DICTIONARY *dict) { +#ifdef NETDATA_INTERNAL_CHECKS + netdata_mutex_lock(&dict->global_pointer_registry_mutex); + JudyHSFreeArray(&dict->global_pointer_registry, PJE0); + netdata_mutex_unlock(&dict->global_pointer_registry_mutex); +#else + ; +#endif +} +static inline void pointer_add(DICTIONARY *dict __maybe_unused, DICTIONARY_ITEM *item) { +#ifdef NETDATA_INTERNAL_CHECKS + netdata_mutex_lock(&dict->global_pointer_registry_mutex); + Pvoid_t *PValue = JudyHSIns(&dict->global_pointer_registry, &item, sizeof(void *), PJE0); + if(*PValue != NULL) + fatal("pointer already exists in registry"); + *PValue = item; + netdata_mutex_unlock(&dict->global_pointer_registry_mutex); +#else + ; +#endif +} + +static inline void pointer_check(DICTIONARY *dict __maybe_unused, DICTIONARY_ITEM *item) { +#ifdef NETDATA_INTERNAL_CHECKS + netdata_mutex_lock(&dict->global_pointer_registry_mutex); + Pvoid_t *PValue = JudyHSGet(dict->global_pointer_registry, &item, sizeof(void *)); + if(PValue == NULL) + fatal("pointer is not found in registry"); + netdata_mutex_unlock(&dict->global_pointer_registry_mutex); +#else + ; +#endif +} + +static inline void pointer_del(DICTIONARY *dict __maybe_unused, DICTIONARY_ITEM *item) { +#ifdef NETDATA_INTERNAL_CHECKS + netdata_mutex_lock(&dict->global_pointer_registry_mutex); + int ret = JudyHSDel(&dict->global_pointer_registry, &item, sizeof(void *), PJE0); + if(!ret) + fatal("pointer to be deleted does not exist in registry"); + netdata_mutex_unlock(&dict->global_pointer_registry_mutex); +#else + ; +#endif +} + // ---------------------------------------------------------------------------- // memory statistics @@ -666,13 +729,21 @@ static inline void dictionary_index_lock_rdlock(DICTIONARY *dict) { netdata_rwlock_rdlock(&dict->index.rwlock); } + +static inline void dictionary_index_rdlock_unlock(DICTIONARY *dict) { + if(unlikely(is_dictionary_single_threaded(dict))) + return; + + netdata_rwlock_unlock(&dict->index.rwlock); +} + static inline void dictionary_index_lock_wrlock(DICTIONARY *dict) { if(unlikely(is_dictionary_single_threaded(dict))) return; netdata_rwlock_wrlock(&dict->index.rwlock); } -static inline void dictionary_index_lock_unlock(DICTIONARY *dict) { +static inline void dictionary_index_wrlock_unlock(DICTIONARY *dict) { if(unlikely(is_dictionary_single_threaded(dict))) return; @@ -735,7 +806,7 @@ static void garbage_collect_pending_deletes(DICTIONARY *dict) { } if(is_view) - dictionary_index_lock_unlock(dict); + dictionary_index_wrlock_unlock(dict); ll_recursive_unlock(dict, DICTIONARY_LOCK_WRITE); @@ -892,7 +963,10 @@ static int item_check_and_acquire_advanced(DICTIONARY *dict, DICTIONARY_ITEM *it if (having_index_lock) { // delete it from the hashtable - hashtable_delete_unsafe(dict, item_get_name(item), item->key_len, item); + if(hashtable_delete_unsafe(dict, item_get_name(item), item->key_len, item) == 0) + error("DICTIONARY: INTERNAL ERROR VIEW: tried to delete item with name '%s', name_len %u that is not in the index", item_get_name(item), (KEY_LEN_TYPE)(item->key_len - 1)); + else + pointer_del(dict, item); // mark it in our dictionary as deleted too // this is safe to be done here, because we have got @@ -961,6 +1035,11 @@ static inline int item_is_not_referenced_and_can_be_removed_advanced(DICTIONARY } while(!__atomic_compare_exchange_n(&item->refcount, &refcount, desired, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)); +#ifdef NETDATA_INTERNAL_CHECKS + if(ret == RC_ITEM_OK) + item->deleter_pid = gettid(); +#endif + if(unlikely(spins > 1 && dict->stats)) DICTIONARY_STATS_DELETE_SPINS_PLUS(dict, spins - 1); @@ -996,6 +1075,8 @@ static size_t hashtable_init_unsafe(DICTIONARY *dict) { static size_t hashtable_destroy_unsafe(DICTIONARY *dict) { if(unlikely(!dict->index.JudyHSArray)) return 0; + pointer_destroy_index(dict); + JError_t J_Error; Word_t ret = JudyHSFreeArray(&dict->index.JudyHSArray, &J_Error); if(unlikely(ret == (Word_t) JERR)) { @@ -1061,6 +1142,7 @@ static inline DICTIONARY_ITEM *hashtable_get_unsafe(DICTIONARY *dict, const char Rc = JudyHSGet(dict->index.JudyHSArray, (void *)name, name_len); if(likely(Rc)) { // found in the hash table + pointer_check(dict, (DICTIONARY_ITEM *)*Rc); return (DICTIONARY_ITEM *)*Rc; } else { @@ -1090,6 +1172,10 @@ static inline void item_linked_list_add(DICTIONARY *dict, DICTIONARY_ITEM *item) else DOUBLE_LINKED_LIST_APPEND_UNSAFE(dict->items.list, item, prev, next); +#ifdef NETDATA_INTERNAL_CHECKS + item->ll_adder_pid = gettid(); +#endif + // clear the BEING created flag, // after it has been inserted into the linked list item_flag_clear(item, ITEM_FLAG_BEING_CREATED); @@ -1103,6 +1189,10 @@ static inline void item_linked_list_remove(DICTIONARY *dict, DICTIONARY_ITEM *it DOUBLE_LINKED_LIST_REMOVE_UNSAFE(dict->items.list, item, prev, next); +#ifdef NETDATA_INTERNAL_CHECKS + item->ll_remover_pid = gettid(); +#endif + garbage_collect_pending_deletes(dict); ll_recursive_unlock(dict, DICTIONARY_LOCK_WRITE); } @@ -1150,8 +1240,14 @@ static DICTIONARY_ITEM *dict_item_create(DICTIONARY *dict __maybe_unused, size_t size_t size = sizeof(DICTIONARY_ITEM); item = callocz(1, size); + +#ifdef NETDATA_INTERNAL_CHECKS + item->creator_pid = gettid(); +#endif + item->refcount = 1; item->flags = ITEM_FLAG_BEING_CREATED; + *allocated_bytes += size; if(master_item) { @@ -1431,14 +1527,16 @@ static bool dict_item_del(DICTIONARY *dict, const char *name, ssize_t name_len) int ret; DICTIONARY_ITEM *item = hashtable_get_unsafe(dict, name, name_len); if(unlikely(!item)) { - dictionary_index_lock_unlock(dict); + dictionary_index_wrlock_unlock(dict); ret = false; } else { if(hashtable_delete_unsafe(dict, name, name_len, item) == 0) - error("DICTIONARY: INTERNAL ERROR: tried to delete item with name '%s' that is not in the index", name); + error("DICTIONARY: INTERNAL ERROR: tried to delete item with name '%s', name_len %zd that is not in the index", name, name_len - 1); + else + pointer_del(dict, item); - dictionary_index_lock_unlock(dict); + dictionary_index_wrlock_unlock(dict); dict_item_free_or_mark_deleted(dict, item); ret = true; @@ -1487,25 +1585,29 @@ static DICTIONARY_ITEM *dict_item_add_or_reset_value_and_acquire(DICTIONARY *dic DICTIONARY_ITEM *item = NULL; do { DICTIONARY_ITEM **item_pptr = (DICTIONARY_ITEM **)hashtable_insert_unsafe(dict, name, name_len); - if (likely(*item_pptr == 0)) { + if (likely(*item_pptr == NULL)) { // a new item added to the index // create the dictionary item item = *item_pptr = dict_item_create_with_hooks(dict, name, name_len, value, value_len, constructor_data, master_item); + pointer_add(dict, item); + // call the hashtable react hashtable_inserted_item_unsafe(dict, item); // unlock the index lock, before we add it to the linked list // DONT DO IT THE OTHER WAY AROUND - DO NOT CROSS THE LOCKS! - dictionary_index_lock_unlock(dict); + dictionary_index_wrlock_unlock(dict); item_linked_list_add(dict, item); added_or_updated = true; } else { + pointer_check(dict, *item_pptr); + if(item_check_and_acquire_advanced(dict, *item_pptr, true) != RC_ITEM_OK) { spins++; continue; @@ -1548,7 +1650,7 @@ static DICTIONARY_ITEM *dict_item_add_or_reset_value_and_acquire(DICTIONARY *dic } } - dictionary_index_lock_unlock(dict); + dictionary_index_wrlock_unlock(dict); } } while(!item); @@ -1592,7 +1694,7 @@ static DICTIONARY_ITEM *dict_item_find_and_acquire(DICTIONARY *dict, const char DICTIONARY_STATS_SEARCH_IGNORES_PLUS1(dict); } - dictionary_index_lock_unlock(dict); + dictionary_index_rdlock_unlock(dict); return item; } @@ -1622,7 +1724,7 @@ static bool dictionary_free_all_resources(DICTIONARY *dict, size_t *mem, bool fo // destroy the index dictionary_index_lock_wrlock(dict); index_size += hashtable_destroy_unsafe(dict); - dictionary_index_lock_unlock(dict); + dictionary_index_wrlock_unlock(dict); ll_recursive_lock(dict, DICTIONARY_LOCK_WRITE); DICTIONARY_ITEM *item = dict->items.list; @@ -1846,6 +1948,8 @@ static DICTIONARY *dictionary_create_internal(DICT_OPTIONS options, struct dicti dict_size += reference_counter_init(dict); dict_size += hashtable_init_unsafe(dict); + pointer_index_init(dict); + DICTIONARY_STATS_PLUS_MEMORY(dict, 0, dict_size, 0); return dict; @@ -1914,6 +2018,8 @@ size_t dictionary_destroy(DICTIONARY *dict) { if(!dict) return 0; + ll_recursive_lock(dict, DICTIONARY_LOCK_WRITE); + dict_flag_set(dict, DICT_FLAG_DESTROYED); DICTIONARY_STATS_DICT_DESTRUCTIONS_PLUS1(dict); @@ -1931,9 +2037,12 @@ size_t dictionary_destroy(DICTIONARY *dict) { dict->referenced_items, dict->entries); + ll_recursive_unlock(dict, DICTIONARY_LOCK_WRITE); return 0; } + ll_recursive_unlock(dict, DICTIONARY_LOCK_WRITE); + size_t freed; dictionary_free_all_resources(dict, &freed, true); @@ -2391,7 +2500,7 @@ static char **dictionary_unittest_generate_names(size_t entries) { char **names = mallocz(sizeof(char *) * entries); for(size_t i = 0; i < entries ;i++) { char buf[25 + 1] = ""; - snprintfz(buf, 25, "name.%zu.0123456789.%zu \t !@#$%%^&*(),./[]{}\\|~`", i, entries / 2 + i); + snprintfz(buf, 25, "name.%zu.0123456789.%zu!@#$%%^&*(),./[]{}\\|~`", i, entries / 2 + i); names[i] = strdupz(buf); } return names; @@ -3030,7 +3139,7 @@ static int dictionary_unittest_threads() { }; // threads testing of dictionary - tu.dict = dictionary_create(DICT_OPTION_NAME_LINK_DONT_CLONE | DICT_OPTION_DONT_OVERWRITE_VALUE); + tu.dict = dictionary_create(DICT_OPTION_DONT_OVERWRITE_VALUE); time_t seconds_to_run = 5; int threads_to_create = 2; fprintf( |