Persistent programming languages don't explicitly lock variables. Objects (or pages) must be locked when accessed. Pages may be protected (no access, read/write) in most current operating systems (see...

Extracted text: Persistent programming languages don't explicitly lock variables. Objects (or pages) must be locked when accessed. Pages may be protected (no access, read/write) in most current operating systems (see the Unix mprotect command, for example). Explain how a persistent programming language's access-protection feature may be utilized for page locking.