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sem.h (3)
  • >> sem.h (3) ( Solaris man: Библиотечные вызовы )
  • sem.h (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    sem.h, sem -  semaphore facility
     
    

    SYNOPSIS

    #include <sys/sem.h>
    

     

    DESCRIPTION

    The <sys/sem.h> header defines the following constants and structures.

    Semaphore operation flags:

    SEM_UNDO

    Set up adjust on exit entry.

    Command definitions for the semctl() function are provided as listed below. See semctl(2).

    GETNCNT

    Get semncnt.

    GETPID

    Get sempid.

    GETVAL

    Get semval.

    GETALL

    Get all cases of semval.

    GETZCNT

    Get semzcnt.

    SETVAL

    Set semval.

    SETALL

    Set all cases of semval.

    The semid_ds structure contains the following members:

    struct ipc_perm sem_perm     /* operation permission structure */
    unsigned short  sem_nsems    /* number of semaphores in set */
    time_t          sem_otime    /* last semop() time */
    time_t          sem_ctime    /* last time changed by semctl() */
    

    The pid_t, time_t, key_t, and size_t types are defined as described in <sys/types.h>. See types.h(3HEAD).

    A semaphore is represented by an anonymous structure containing the following members:

    unsigned short semval     /* semaphore value */
    pid_t          sempid     /* process ID of last operation */
    unsigned short semncnt    /* number of processes waiting for semval
                                to become greater than current value */
    unsigned short semzcnt    /* number of processes waiting for semval
                                to become 0 */
    

    The sembuf structure contains the following members:

    unsigned short sem_num     /* semaphore number */
    short          sem_op      /* semaphore operation */
    short          sem_flg     /* operation flags */
    

    All of the symbols from <sys/ipc.h> are defined when this header is included. See ipc.h(3HEAD).  

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    Interface StabilityStandard

     

    SEE ALSO

    semctl(2), semget(2), semop(2), ipc.h(3HEAD), types.h(3HEAD), attributes(5), standards(5)


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    ATTRIBUTES
    SEE ALSO


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