Add C API to set base_backgroud_compactions

Summary:
Add C API to set base_backgroud_compactions
Closes https://github.com/facebook/rocksdb/pull/1571

Differential Revision: D4245709

Pulled By: yiwu-arbug

fbshipit-source-id: 792c6b8

db/c.cc

@@ -1740,6 +1740,11 @@ void rocksdb_options_set_max_background_compactions(rocksdb_options_t* opt, int
   opt->rep.max_background_compactions = n;
 }
 
+void rocksdb_options_set_base_background_compactions(rocksdb_options_t* opt,
+                                                     int n) {
+  opt->rep.base_background_compactions = n;
+}
+
 void rocksdb_options_set_max_background_flushes(rocksdb_options_t* opt, int n) {
   opt->rep.max_background_flushes = n;
 }

db/c_test.c

@@ -323,6 +323,7 @@ int main(int argc, char** argv) {
   rocksdb_options_set_write_buffer_size(options, 100000);
   rocksdb_options_set_paranoid_checks(options, 1);
   rocksdb_options_set_max_open_files(options, 10);
+  rocksdb_options_set_base_background_compactions(options, 1);
   table_options = rocksdb_block_based_options_create();
   rocksdb_block_based_options_set_block_cache(table_options, cache);
   rocksdb_options_set_block_based_table_factory(options, table_options);

include/rocksdb/c.h

@@ -585,6 +585,8 @@ rocksdb_options_set_max_write_buffer_number_to_maintain(rocksdb_options_t*,
                                                         int);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_max_background_compactions(
     rocksdb_options_t*, int);
+extern ROCKSDB_LIBRARY_API void rocksdb_options_set_base_background_compactions(
+    rocksdb_options_t*, int);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_max_background_flushes(
     rocksdb_options_t*, int);
 extern ROCKSDB_LIBRARY_API void rocksdb_options_set_max_log_file_size(