sessemaphore.h

在LINUX环境下

/****************************************************************************
 *
 *         (c) Copyright 2006 by SCADA Enterprise Solutions Inc
 *         All rights reserved
 *
 * NAME:
 *
 *         sesSemaphore.H -- This is the header include file for the
 *                           semaphore functions.
 *
 * AUTHOR: Wai Tse
 *
 * DESCRIPTION:
 *
 *         This program allows other objects to handle the signal interruption.
 *
 * REVISION HISTORY:
 *
 *         11-JUN-2006    Wai Tse    Created the initial version.
 * 
 ***************************************************************************/

#ifndef SES_SEMA_H
#define SES_SEMA_H

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include "sesDbg.H"
#include "sesLogErr.H"

// For locking
#define SEMA_LOCK -1
#define SEMA_UNLOCK 1

// For semaphore access
#define SEMA_TOTAL   4
#define SEMA_HASH    0
#define SEMA_HEADER  1
#define SEMA_VALUE   2
#define SEMA_SSMA    3

#define SEMA_KEY_HASH         "/opt/ems/dat/sem-hash"
#define SEMA_KEY_HEADER       "/opt/ems/dat/sem-db-hdr"
#define SEMA_KEY_VALUE        "/opt/ems/dat/sem-db-val"
#define SEMA_KEY_SSMA         "/opt/ems/dat/sem-ssma"
#define SEMA_KEY_SSMA_STACK   "/opt/ems/dat/sem-ssma-stack"
#define SEMA_KEY_TAG          "/opt/ems/dat/sem-db-tag"
#define SEMA_KEY_PKT          "/opt/ems/dat/sem-db-pkt"
#define SEMA_KEY_SYNC         "/opt/ems/dat/sem-db-sync"


//*****************************************************************
// This function creates a semaphore
//*****************************************************************
int semaCreate(int &_semid, char *keyName);

//*****************************************************************
// This function attaches to a semaphore
//*****************************************************************
int semaAttach(int &_semid, char *keyName);

//*****************************************************************
// This function waits on the semaphore and locks or release
// the semaphore when it is available.
//*****************************************************************
int semaAct(int _semid, int action);

//*****************************************************************
// This function waits on the semaphore and locks or release
// the semaphore when it available.
//*****************************************************************
int semaRemove(int _semid);

#endif // SES_SEMA_H