semget

semget KEY,NSEMS,FLAGS

Calls the System V IPC function semget(2). Returns the semaphore id, or the undefined value on error. See also SysV IPC in perlipc, IPC::SysV , IPC::SysV::Semaphore documentation.

Portability issues: semget in perlport.

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https://perldoc.perl.org/5.20.2/functions/semget.html