Android PackageManagerService中LI，LP等函数后缀的含义

PackageManagerService中有很多函数带有LI，LP，或者LPr，LPw的后缀，表示什么意思?

LI – 该函数被调用时需要持有mInstallLock这把锁
LP – 该函数被调用时需要持有mPackages这个HashMap对象
LPr – 表示读
LPw – 表示写

// Lock for state used when installing and doing other long running
// operations. Methods that must be called with this lock held have
// the prefix “LI”.
final Object mInstallLock = new Object();

// Keys are String (package name), values are Package. This also serves
361 // as the lock for the global state. Methods that must be called with
362 // this lock held have the prefix “LP”.
363 final HashMap<String, PackageParser.Package> mPackages =
364 new HashMap<String, PackageParser.Package>();