FreeTDS API
 
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pool.h
1/* TDSPool - Connection pooling for TDS based databases
2 * Copyright (C) 2001 Brian Bruns
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 */
19
20#ifndef _pool_h_
21#define _pool_h_
22
23#include <assert.h>
24
25#if HAVE_SYS_TYPES_H
26#include <sys/types.h>
27#endif
28
29#if HAVE_NETINET_IN_H
30#include <netinet/in.h>
31#endif
32
33/*
34 * POSIX says fd_set type may be defined in either sys/select.h or sys/time.h.
35 */
36#if HAVE_SYS_TIME_H
37#include <sys/time.h>
38#endif
39
40#include <freetds/tds.h>
41#include <freetds/utils/dlist.h>
42
43/* defines */
44#define PGSIZ 2048
45#define BLOCKSIZ 512
46#define MAX_POOL_USERS 1024
47
48/* enums and typedefs */
49typedef enum
50{
51 TDS_SRV_WAIT, /* if no members are free wait */
52 TDS_SRV_QUERY,
53} TDS_USER_STATE;
54
55/* forward declaration */
56typedef struct tds_pool_event TDS_POOL_EVENT;
57typedef struct tds_pool_socket TDS_POOL_SOCKET;
58typedef struct tds_pool_member TDS_POOL_MEMBER;
59typedef struct tds_pool_user TDS_POOL_USER;
60typedef struct tds_pool TDS_POOL;
61typedef void (*TDS_POOL_EXECUTE)(TDS_POOL_EVENT *event);
62
64{
65 TDS_POOL_EVENT *next;
66 TDS_POOL_EXECUTE execute;
67};
68
70{
71 TDSSOCKET *tds;
72 bool poll_recv;
73 bool poll_send;
74};
75
77{
78 TDS_POOL_SOCKET sock;
79 DLIST_FIELDS(dlist_user_item);
80 TDSLOGIN *login;
81 TDS_USER_STATE user_state;
82 TDS_POOL_MEMBER *assigned_member;
83};
84
86{
87 TDS_POOL_SOCKET sock;
88 DLIST_FIELDS(dlist_member_item);
89 bool doing_async;
90 time_t last_used_tm;
91 TDS_POOL_USER *current_user;
92};
93
94#define DLIST_PREFIX dlist_member
95#define DLIST_LIST_TYPE dlist_members
96#define DLIST_ITEM_TYPE TDS_POOL_MEMBER
97#include <freetds/utils/dlist.tmpl.h>
98
99#define DLIST_PREFIX dlist_user
100#define DLIST_LIST_TYPE dlist_users
101#define DLIST_ITEM_TYPE TDS_POOL_USER
102#include <freetds/utils/dlist.tmpl.h>
103
105{
106 char *name;
107 char *user;
108 char *password;
109 char *server;
110 char *database;
111 char *server_user;
112 char *server_password;
113 int port;
114 int max_member_age; /* in seconds */
115 int min_open_conn;
116 int max_open_conn;
117 tds_mutex events_mtx;
118 TDS_SYS_SOCKET listen_fd;
119 TDS_SYS_SOCKET wakeup_fd;
120 TDS_SYS_SOCKET event_fd;
121 TDS_POOL_EVENT *events;
122
123 int num_active_members;
124 dlist_members active_members;
125 dlist_members idle_members;
126
128 dlist_users waiters;
129 int num_users;
130 dlist_users users;
131 TDSCONTEXT *ctx;
132
133 unsigned long user_logins;
134 unsigned long member_logins;
135};
136
137/* prototypes */
138
139/* member.c */
140int pool_process_members(TDS_POOL * pool, fd_set * rfds, fd_set * wfds);
141TDS_POOL_MEMBER *pool_assign_idle_member(TDS_POOL * pool, TDS_POOL_USER *user);
142void pool_mbr_init(TDS_POOL * pool);
143void pool_mbr_destroy(TDS_POOL * pool);
144void pool_free_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr);
145void pool_assign_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr, TDS_POOL_USER *puser);
146void pool_deassign_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr);
147void pool_reset_member(TDS_POOL *pool, TDS_POOL_MEMBER * pmbr);
148bool pool_packet_read(TDSSOCKET * tds);
149
150/* user.c */
151void pool_process_users(TDS_POOL * pool, fd_set * rfds, fd_set * wfds);
152void pool_user_init(TDS_POOL * pool);
153void pool_user_destroy(TDS_POOL * pool);
154TDS_POOL_USER *pool_user_create(TDS_POOL * pool, TDS_SYS_SOCKET s);
155void pool_free_user(TDS_POOL * pool, TDS_POOL_USER * puser);
156void pool_user_query(TDS_POOL * pool, TDS_POOL_USER * puser);
157bool pool_user_send_login_ack(TDS_POOL * pool, TDS_POOL_USER * puser);
158void pool_user_finish_login(TDS_POOL * pool, TDS_POOL_USER * puser);
159
160/* util.c */
161void dump_login(TDSLOGIN * login);
162void pool_event_add(TDS_POOL *pool, TDS_POOL_EVENT *ev, TDS_POOL_EXECUTE execute);
163int pool_write(TDS_SYS_SOCKET sock, const void *buf, size_t len);
164bool pool_write_data(TDS_POOL_SOCKET *from, TDS_POOL_SOCKET *to);
165
166/* config.c */
167bool pool_read_conf_files(const char *path, const char *poolname, TDS_POOL * pool, char **err);
168
169
170#endif
Main include file for libtds.
Definition pool.h:64
Definition pool.h:70
Definition pool.h:77
Definition pool.h:86
Definition pool.h:105
dlist_users waiters
users in wait state
Definition pool.h:128