Add Send implementation for WriteBatch (#453)

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 * Export the `DEFAULT_COLUMN_FAMILY_NAME` constant.
 * Implement `Clone` trait for `Options`.
+* Added `Send` implementation to `WriteBatch`.
 
 ## 0.14.0 (2020-04-22)
 

src/lib.rs

@@ -163,7 +163,7 @@ mod test {
     use super::{
         BlockBasedOptions, ColumnFamily, ColumnFamilyDescriptor, DBIterator, DBRawIterator,
         IngestExternalFileOptions, Options, PlainTableFactoryOptions, ReadOptions, Snapshot,
-        SstFileWriter, WriteOptions, DB,
+        SstFileWriter, WriteBatch, WriteOptions, DB,
     };
 
     #[test]
@@ -188,6 +188,7 @@ mod test {
         is_send::<ColumnFamilyDescriptor>();
         is_send::<ColumnFamily>();
         is_send::<SstFileWriter>();
+        is_send::<WriteBatch>();
     }
 
     #[test]

src/write_batch.rs

@@ -279,3 +279,5 @@ impl Drop for WriteBatch {
         unsafe { ffi::rocksdb_writebatch_destroy(self.inner) }
     }
 }
+
+unsafe impl Send for WriteBatch {}