Add a helper function to decrement read and write at the same time

src/common/token_bucket.c

@@ -178,3 +178,14 @@ token_bucket_dec_write(token_bucket_t *bucket,
   return decrement_single_bucket(&bucket->write_bucket, n);
 }
 
+/**
+ * As token_bucket_dec_read and token_bucket_dec_write, in a single operation.
+ */
+void
+token_bucket_dec(token_bucket_t *bucket,
+                 ssize_t n_read, ssize_t n_written)
+{
+  token_bucket_dec_read(bucket, n_read);
+  token_bucket_dec_read(bucket, n_written);
+}
+

src/common/token_bucket.h

@@ -43,6 +43,9 @@ int token_bucket_dec_read(token_bucket_t *bucket,
 int token_bucket_dec_write(token_bucket_t *bucket,
                            ssize_t n);
 
+void token_bucket_dec(token_bucket_t *bucket,
+                      ssize_t n_read, ssize_t n_written);
+
 static inline size_t token_bucket_get_read(const token_bucket_t *bucket);
 static inline size_t
 token_bucket_get_read(const token_bucket_t *bucket)