memsem.hh

Source code for an Numeric Cmputer

/********************************************************************
* Description: memsem.hh
*   Provides function prototypes that let programmers use a block of
*   memory to implement a mutual exclusion semaphore.
*
*   Derived from a work by Fred Proctor & Will Shackleford
*
* Author:
* License: LGPL Version 2
* System: Linux
*    
* Copyright (c) 2004 All rights reserved.
*
* Last change: 
* $Revision: 1.6 $
* $Author: paul_c $
* $Date: 2005/05/23 16:34:10 $
********************************************************************/

#ifndef MEMSEM_HH
#define MEMSEM_HH

#include "sem.hh"

/* Take the mutual exclusion semaphore. */
struct mem_access_object {
    void *data;
    long connection_number;
    long total_connections;
    double timeout;
    double sem_delay;
    int read_only;
    int split_buffer;
    char toggle_bit;
    RCS_SEMAPHORE *sem;
};

extern int mem_get_access(struct mem_access_object *mo);

/* Give up the mutual exclusion semaphore. */
extern int mem_release_access(struct mem_access_object *mo);

#endif