1  /********************************************************************
 2  * Description: memsem.hh
 3  *   Provides function prototypes that let programmers use a block of
 4  *   memory to implement a mutual exclusion semaphore.
 5  *
 6  *   Derived from a work by Fred Proctor & Will Shackleford
 7  *
 8  * Author:
 9  * License: LGPL Version 2
10  * System: Linux
11  *    
12  * Copyright (c) 2004 All rights reserved.
13  *
14  * Last change: 
15  ********************************************************************/
16  
17  #ifndef MEMSEM_HH
18  #define MEMSEM_HH
19  
20  #include "sem.hh"
21  
22  /* Take the mutual exclusion semaphore. */
23  struct mem_access_object {
24      void *data;
25      long connection_number;
26      long total_connections;
27      double timeout;
28      double sem_delay;
29      int read_only;
30      int split_buffer;
31      char toggle_bit;
32      RCS_SEMAPHORE *sem;
33  };
34  
35  extern int mem_get_access(struct mem_access_object *mo);
36  
37  /* Give up the mutual exclusion semaphore. */
38  extern int mem_release_access(struct mem_access_object *mo);
39  
40  #endif