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.