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Semaphore (3)
  • >> Semaphore (3) ( Solaris man: Библиотечные вызовы )
  • 
    
    

    NAME

         IPC::Semaphore - SysV Semaphore IPC object class
    
    
    

    SYNOPSIS

             use IPC::SysV qw(IPC_PRIVATE S_IRWXU IPC_CREAT);
             use IPC::Semaphore;
    
             $sem = new IPC::Semaphore(IPC_PRIVATE, 10, S_IRWXU | IPC_CREAT);
    
             $sem->setall( (0) x 10);
    
             @sem = $sem->getall;
    
             $ncnt = $sem->getncnt;
    
             $zcnt = $sem->getzcnt;
    
             $ds = $sem->stat;
    
             $sem->remove;
    
    
    
    

    DESCRIPTION

    
    

    METHODS

         new ( KEY , NSEMS , FLAGS )
             Create a new semaphore set associated with KEY. NSEMS is
             the number of semaphores in the set. A new set is
             created if
    
         o       KEY is equal to IPC_PRIVATE
    
         o       KEY does not already  have  a  semaphore  identifier
                 associated with it, and FLAGS & IPC_CREAT is true.
    
                 On creation of a new semaphore set FLAGS is used to
                 set the permissions.
    
         getall
             Returns the values of the semaphore set as an array.
    
         getncnt ( SEM )
             Returns the number of processed waiting for the
             semaphore SEM to become greater than it's current value
    
         getpid ( SEM )
             Returns the process id of the last process that
             performed an operation on the semaphore SEM.
    
         getval ( SEM )
             Returns the current value of the semaphore SEM.
    
    
         getzcnt ( SEM )
             Returns the number of processed waiting for the
             semaphore SEM to become zero.
    
         id  Returns the system identifier for the semaphore set.
    
         op ( OPLIST )
             OPLIST is a list of operations to pass to semop. OPLIST
             is a concatenation of smaller lists, each which has
             three values. The first is the semaphore number, the
             second is the operation and the last is a flags value.
             See the semop manpage for more details. For example
    
                 $sem->op(
                     0, -1, IPC_NOWAIT,
                     1,  1, IPC_NOWAIT
                 );
    
    
         remove
             Remove and destroy the semaphore set from the system.
    
         set ( STAT )
    
         set ( NAME => VALUE [, NAME => VALUE ...] )
             set will set the following values of the stat structure
             associated with the semaphore set.
    
                 uid
                 gid
                 mode (oly the permission bits)
    
             set accepts either a stat object, as returned by the
             stat method, or a list of name-value pairs.
    
         setall ( VALUES )
             Sets all values in the semaphore set to those given on
             the VALUES list.  VALUES must contain the correct number
             of values.
    
         setval ( N , VALUE )
             Set the Nth value in the semaphore set to VALUE
    
         stat
             Returns an object of type IPC::Semaphore::stat which is
             a sub-class of Class::Struct. It provides the following
             fields. For a description of these fields see you system
             documentation.
    
    
    
                 uid
                 gid
                 cuid
                 cgid
                 mode
                 ctime
                 otime
                 nsems
    
    
    
    

    SEE ALSO

         the IPC::SysV manpage the Class::Struct manpage the semget
         manpage the semctl manpage the semop manpage
    
    
    

    AUTHOR

         Graham Barr <gbarr@pobox.com>
    
    
    

    COPYRIGHT

         Copyright (c) 1997 Graham Barr. All rights reserved.  This
         program is free software; you can redistribute it and/or
         modify it under the same terms as Perl itself.
    
    
    
    


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