lock(+Module)

Module

Atom.

This built-in predicate is obsolete!

Description

It is impossible to unlock a module locked with lock/1. However, a module locked using lock/2, can still be unlocked with unlock/2.

An error is raised (error 82) when trying to lock a locked module.

Modes and Determinism

• lock(+) is det

Exceptions

(4) instantiation fault

Module is not instantiated.

(5) type error

Module is instantiated, but not to an atom.

(80) not a module

Module is not a module.

(82) trying to access a locked module

Trying to access a locked module Module.

Examples

Success:
     [eclipse]: [user].
      :- module(m).
      :- export p/0.
      p :- writeln(hello).
      user compiled 60 bytes in 0.00 seconds
     yes.
     [eclipse]: lock(m).
     yes.
     [eclipse]: module(m).
     trying to access a locked module in module(m)
     [eclipse]: import p/0 from m.
     yes.
     [eclipse]: call(p) @ m.
     trying to access a locked module in p
     [eclipse]: p.
     hello
     yes.
Error:
     lock(M).                   (Error 4).
     lock(1).                   (Error 5).
     lock(not_a_module).        (Error 80).
     lock(m), call(p) @ m.      (Error 82).

See Also