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Perl in a Nutshell, 2nd Edition
book

Perl in a Nutshell, 2nd Edition

by Nathan Patwardhan, Ellen Siever, Stephen Spainhour
June 2002
Beginner content levelBeginner
759 pages
80h 42m
English
O'Reilly Media, Inc.
Content preview from Perl in a Nutshell, 2nd Edition

Name

lock

Synopsis

lock var
lock sub
                  

Locks a variable or a subroutine. A lock on a variable is maintained until the lock goes out of scope. If the variable is already locked by another thread, the lock call blocks until the variable is available. You can recursively lock the variable, which stays locked until the outermost lock goes out of scope.

Note that locks on variables affect only other lock calls; they don’t prevent normal access to a variable. Also, locking a container object (e.g., an array) doesn’t lock each element of the container.

Locking a subroutine blocks any calls to the subroutine until the lock goes out of scope; no other thread can access the subroutine while the lock is in effect.

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Publisher Resources

ISBN: 0596002416Errata Page