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Annotation of coherent/a/usr/man/COHERENT/sem, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: sem                       Device Driver                       sem
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        !             8: Semaphore device driver
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        !            10: 
        !            11: /dev/sem is  an interface to the semaphore  device driver.  It is
        !            12: assigned major device 23 (minor  device 0) and can be accessed as
        !            13: a character-special device.
        !            14: 
        !            15: All semaphore operations  are performed through the COHERENT sys-
        !            16: tem  call ioctl.   The operations semctl,  semget, and  semop are
        !            17: performed with an  integer parameter array.  The first element of
        !            18: the array is reserved  for the return value (default -1).  Subse-
        !            19: quent  elements represent  arguments.  The  call to  ioctl passes
        !            20: SEMCTL,  SEMGET,  or  SEMOP  as  the  second  argument,  and  the
        !            21: parameter array as the  third argument.  The first argument is an
        !            22: open file descriptor to /dev/sem.
        !            23: 
        !            24: ***** Access *****
        !            25: 
        !            26: Prior to accessing the devices, a entry must be created in  /dev,
        !            27: as follows:
        !            28: 
        !            29: 
        !            30: /etc/mknod /dev/sem c 23 0
        !            31: chmod 666 /dev/sem
        !            32: 
        !            33: 
        !            34: ***** Bugs ***** Allocation of too many semaphore ids (NNSSEEMMIIDD) or
        !            35: semaphores per  identifier (NNSSEEMM) can exhaust  kernel data space,
        !            36: which will stop the system in its tracks.
        !            37: 
        !            38: Private semaphore sets  are not supported.  Semaphore ids must be
        !            39: removed  manually  when   no  longer  required.   To  remove  all
        !            40: semaphore identifiers, use the following code:
        !            41: 
        !            42: 
        !            43: #include <sys/sem.h>
        !            44: #define NSEMID 16
        !            45: 
        !            46: semget( 0, 0 );     /* must do first */
        !            47: 
        !            48: for ( id=0; id < NSEMID; ++id )
        !            49:         semctl( id, 0, IPC_RMID, 0 );
        !            50: 
        !            51: 
        !            52: To load the driver sem into memory, use the command drvld.
        !            53: 
        !            54: ***** Files *****
        !            55: 
        !            56: /uussrr/iinncclluuddee/ssyyss/iippcc.hh
        !            57: /uussrr/iinncclluuddee/ssyyss/sseemm.hh
        !            58: /ddeevv/sseemm -- Device
        !            59: /ddrrvv/sseemm -- Loadable device driver
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        !            63: 
        !            64: COHERENT Lexicon                                           Page 1
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        !            68: 
        !            69: sem                       Device Driver                       sem
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        !            72: 
        !            73: ***** See Also *****
        !            74: 
        !            75: device drivers, drvld, semctl(), semget(), semop()
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        !           130: COHERENT Lexicon                                           Page 2
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