The Realm Swift SDK public API contains types that fall into three broad categories:
- Sendable
- Not Sendable and not thread confined
- Thread-confined
You can share types that are not Sendable and not thread confined between threads, but you must synchronize them.
Thread-confined types, unless frozen, are confined to an isolation context. You cannot pass them between these contexts even with synchronization.
| Sendable | Non-Sendable | Thread-Confined |
|---|---|---|
| AnyBSON | RLMAppConfiguration | AnyRealmCollection |
| AsyncOpen | RLMFindOneAndModifyOptions | AnyRealmValue |
| AsyncOpenSubscription | RLMFindOptions | List |
| RLMAPIKeyAuth | RLMNetworkTransport | Map |
| RLMApp | RLMRequest | MutableSet |
| RLMAsyncOpenTask | RLMResponse | Projection |
| RLMChangeStream | RLMSyncConfiguration | RLMArray |
| RLMCompensatingWriteInfo | RLMSyncTimeoutOptions | RLMChangeStream |
| RLMCredentials | RLMDictionary | |
| RLMDecimal128 | RLMDictionaryChange | |
| RLMEmailPasswordAuth | RLMEmbeddedObject | |
| RLMMaxKey | RLMLinkingObjects | |
| RLMMinKey | RLMObject | |
| RLMMongoClient | RLMPropertyChange | |
| RLMMongoCollection | RLMRealm | |
| RLMMongoDatabase | RLMResults | |
| RLMObjectId | RLMSection | |
| RLMObjectSchema | RLMSectionedResults | |
| RLMProgressNotification | RLMSectionedResultsChangeset | |
| RLMProgressNotificationToken | RLMSet | |
| RLMProperty | RLMSyncSubscription | |
| RLMPropertyDescriptor | RLMSyncSubscriptionSet | |
| RLMProviderClient | RealmOptional | |
| RLMPushClient | RealmProperty | |
| RLMSchema | ||
| RLMSortDescriptor | ||
| RLMSyncErrorActionToken | ||
| RLMSyncManager | ||
| RLMSyncSession | ||
| RLMThreadSafeReference | ||
| RLMUpdateResult | ||
| RLMUser | ||
| RLMUserAPIKey | ||
| RLMUserIdentity | ||
| RLMUserProfile | ||
| ThreadSafe |