Function sc_consensus_pow::start_mine

pub fn start_mine<B: BlockT, C, Algorithm, E, SO, S, CAW>(
    block_import: BoxBlockImport<B, TransactionFor<C, B>>, 
    client: Arc<C>, 
    algorithm: Algorithm, 
    env: E, 
    preruntime: Option<Vec<u8>>, 
    round: u32, 
    sync_oracle: SO, 
    build_time: Duration, 
    select_chain: Option<S>, 
    inherent_data_providers: InherentDataProviders, 
    can_author_with: CAW
) where
    C: HeaderBackend<B> + AuxStore + ProvideRuntimeApi<B> + 'static,
    Algorithm: PowAlgorithm<B> + Send + Sync + 'static,
    E: Environment<B> + Send + Sync + 'static,
    E::Error: Debug,
    E::Proposer: Proposer<B, Transaction = TransactionFor<C, B>>,
    SO: SyncOracle + Send + Sync + 'static,
    S: SelectChain<B> + 'static,
    CAW: CanAuthorWith<B> + Send + 'static, 

Start the background mining thread for PoW. Note that because PoW mining is CPU-intensive, it is not possible to use an async future to define this. However, it's not recommended to use background threads in the rest of the codebase.

preruntime is a parameter that allows a custom additional pre-runtime digest to be inserted for blocks being built. This can encode authorship information, or just be a graffiti. round is for number of rounds the CPU miner runs each time. This parameter should be tweaked so that each mining round is within sub-second time.