Skip to Main Content
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

semop

Synopsis

semop key, opstring
                  

Calls the System V IPC system call semop(2) to perform semaphore operations such as signaling and waiting. opstring must be a packed array of semop structures. You can make each semop structure by saying pack('s*', $semnum, $semop, $semflag). The number of semaphore operations is implied by the length of opstring. The function returns true if successful or false if there is an error. On error, it puts the error code into $!. Before calling, you should say:

require "ipc.ph";
require "sem.ph";

This function is available only on machines supporting System V IPC.

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Perl by Example, Fourth Edition

Perl by Example, Fourth Edition

Ellie Quigley
Perl Cookbook, 2nd Edition

Perl Cookbook, 2nd Edition

Tom Christiansen, Nathan Torkington
Perl in a Nutshell

Perl in a Nutshell

Nathan Patwardhan, Ellen Siever, Stephen Spainhour
Learning Perl, 7th Edition

Learning Perl, 7th Edition

Randal L. Schwartz, brian d foy, Tom Phoenix

Publisher Resources

ISBN: 0596002416Errata Page