source: trunk/include/sh_fifo.h @ 272

Last change on this file since 272 was 272, checked in by katerina, 12 years ago

Fixes tickets #190, #191, #192, #193, and #194.

File size: 1.8 KB
Line 
1
2#ifndef SH_FIFO_H
3#define SH_FIFO_H
4
5/*****************************************************
6 *
7 * the maximum number of entries the fifo will hold
8 * - additional entries are simply not accepted -
9 *
10 *****************************************************/
11
12#define SH_FIFO_MAX 16384
13
14/*****************************************************
15 *
16 * the type definitions for the fifo
17 *
18 *****************************************************/
19
20struct dlist {
21  struct dlist * next;
22  char         * data;
23  char         * s_xtra;
24  int            i_xtra;
25  int            transact;
26  struct dlist * prev;
27};
28
29typedef struct fifo_str {
30  struct dlist * head_ptr;
31  struct dlist * tail_ptr;
32  int            fifo_cts;
33} SH_FIFO;
34
35/*****************************************************
36 *
37 * fifo functions
38 *
39 *****************************************************/
40
41/* Initialize the list.
42 *
43 */
44#define fifo_init(fifo_p) { fifo_p->fifo_cts = 0; fifo_p->head_ptr = NULL; \
45 fifo_p->tail_ptr = NULL; }
46
47
48/* Push an item on the head of the list.
49 *
50 * Returns: -1 if the list is full, 0 on success
51 */
52int push_list (SH_FIFO * fifo, char * indat, int in_i, const char * in_str);
53
54/* Push an item on the tail of the list.
55 *
56 * Returns: -1 if the list is full, 0 on success
57 */
58int push_tail_list (SH_FIFO * fifo, char * indat, int in_i, const char * in_str);
59
60/* pop an item from the tail of the list
61 *
62 * Returns: NULL if the list is empty,
63 *          freshly allocated memory on success (should be free'd by caller)
64 */
65char * pop_list (SH_FIFO * fifo);
66
67
68sh_string * tag_list (SH_FIFO * fifo, char * tag,
69                      int(*check)(int, const char*, const char*, const void*),
70                      const void * info, int okNull);
71void rollback_list (SH_FIFO * fifo);
72void mark_list (SH_FIFO * fifo);
73void reset_list (SH_FIFO * fifo);
74int commit_list (SH_FIFO * fifo);
75
76#endif
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