posix
Class SemSet

java.lang.Object
  posix.IPC
      posix.SemSet

public class SemSet
extends IPC

Represent a posix semaphore set. Work in progress.

Nested Class Summary

static class

SemSet.semid_ds

Nested classes/interfaces inherited from class posix.IPC

IPC.Perm

Field Summary

static short

SEM_UNDO

Fields inherited from class posix.IPC

egid, euid, id, IPC_ALLOC, IPC_CI, IPC_CREAT, IPC_EXCL, IPC_NOCLEAR, IPC_NOWAIT, IPC_PHYS, IPC_PRIVATE, owner, pid

Constructor Summary

SemSet(int qid)
Attach to an existing semaphore set

SemSet(int key, int nsem, int flag)

SemSet(String path, int id)
Attach to an existing semaphore set

Method Summary

char	getNCnt(char semnum)
int	getPid(char semnum)
SemSet.semid_ds	getStatus() Return the permissions for this IPC data structure.
short	getValue(char semnum)
short[]	getValues()
char	getZCnt(char semnum)
void	remove() Remove this IPC data structure from the system.
static int	semget(int key, int num, int flag)
void	semop(short[] sema)
void	setPerm(IPC.Perm st) Set the uid, gid, mode, qbytes for this IPC data structure.
void	setValue(char semnum, short val)
void	setValues(short[] vals)

Methods inherited from class posix.IPC

dispose, finalize, ftok, getId, getPerm, isPidValid, setPerm

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SEM_UNDO

public static final short SEM_UNDO

Constructor Detail

SemSet

public SemSet(int key,
              int nsem,
              int flag)
       throws IPCException

Throws:

IPCException

SemSet

public SemSet(int qid)
       throws IPCException

Attach to an existing semaphore set

Throws:

IPCException

SemSet

public SemSet(String path,
              int id)
       throws IPCException

Attach to an existing semaphore set

Throws:

IPCException

Method Detail

remove

public void remove()

Description copied from class: IPC

Remove this IPC data structure from the system.

Specified by:

remove in class IPC

semget

public static int semget(int key,
                         int num,
                         int flag)

getStatus

public SemSet.semid_ds getStatus()
                          throws IPCException

Description copied from class: IPC

Return the permissions for this IPC data structure.

Specified by:

getStatus in class IPC

Throws:

IPCException

setPerm

public void setPerm(IPC.Perm st)
             throws IPCException

Set the uid, gid, mode, qbytes for this IPC data structure. Only a process with appropriate privileges can raise the value of msg_qbytes.

Specified by:

setPerm in class IPC

Parameters:

st - a current msqid_ds obtained from getStatus()

Throws:

IPCException

semop

public void semop(short[] sema)
           throws IPCException

Throws:

IPCException

getPid

public int getPid(char semnum)
           throws IPCException

Throws:

IPCException

getNCnt

public char getNCnt(char semnum)
             throws IPCException

Throws:

IPCException

getZCnt

public char getZCnt(char semnum)
             throws IPCException

Throws:

IPCException

getValue

public short getValue(char semnum)
               throws IPCException

Throws:

IPCException

setValue

public void setValue(char semnum,
                     short val)
              throws IPCException

Throws:

IPCException

getValues

public short[] getValues()
                  throws IPCException

Throws:

IPCException

setValues

public void setValues(short[] vals)
               throws IPCException

Throws:

IPCException