June 2002
Beginner
759 pages
80h 42m
English
semop
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.