add some comments to explain communication worker logic
add some comments to explain communication worker logic

habanero-rice/hclib,DaoWen/hclib-debug,habanero-rice/hcpp,habanero-rice/hclib,habanero-rice/hclib,habanero-rice/hclib,habanero-rice/hcpp,habanero-rice/hclib,habanero-rice/hcpp,DaoWen/hclib-debug,DaoWen/hclib-debug,habanero-rice/hclib,habanero-rice/hclib,habanero-rice/hcpp