int
new_parallel_chunk_compressor(int out_ctype, u32 out_chunk_size,
unsigned num_threads, u64 max_memory,
struct chunk_compressor **compressor_ret);
int
new_parallel_chunk_compressor(int out_ctype, u32 out_chunk_size,
unsigned num_threads, u64 max_memory,
struct chunk_compressor **compressor_ret);