1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/* Copyright (C) 2005 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/**
* @TODO There is plugin.h and also sql_plugin.h. Ostensibly,
* it seems that the two files exist so that plugin.h can provide an
* external API for plugin developers and sql_plugin.h will provide
* and internal server API for dealing with those plugins.
*
* However, there are parts of plugin.h marked "INTERNAL USE ONLY" which
* seems to contradict the above...
*
* Let's figure out a better way of dividing the public and internal API
* and name the files more appropriately.
*
* Also, less #defines, more enums and bitmaps...
*
*/
#ifndef DRIZZLE_SERVER_PLUGIN_H
#define DRIZZLE_SERVER_PLUGIN_H
class sys_var;
/*
the following flags are valid for plugin_init()
*/
#define PLUGIN_INIT_SKIP_DYNAMIC_LOADING 1
#define PLUGIN_INIT_SKIP_PLUGIN_TABLE 2
#define PLUGIN_INIT_SKIP_INITIALIZATION 4
#define INITIAL_LEX_PLUGIN_LIST_SIZE 16
/*
the following #define adds server-only members to enum_mysql_show_type,
that is defined in plugin.h
*/
#define SHOW_FUNC SHOW_FUNC, SHOW_KEY_CACHE_LONG, SHOW_KEY_CACHE_LONGLONG, \
SHOW_LONG_STATUS, SHOW_DOUBLE_STATUS, SHOW_HAVE, \
SHOW_MY_BOOL, SHOW_HA_ROWS, SHOW_SYS, SHOW_LONG_NOFLUSH, \
SHOW_LONGLONG_STATUS
#include <drizzled/plugin.h>
#undef SHOW_FUNC
typedef enum enum_mysql_show_type SHOW_TYPE;
typedef struct st_mysql_show_var SHOW_VAR;
#define MYSQL_ANY_PLUGIN -1
/*
different values of st_plugin_int::state
though they look like a bitmap, plugin may only
be in one of those eigenstates, not in a superposition of them :)
It's a bitmap, because it makes it easier to test
"whether the state is one of those..."
*/
#define PLUGIN_IS_FREED 1
#define PLUGIN_IS_DELETED 2
#define PLUGIN_IS_UNINITIALIZED 4
#define PLUGIN_IS_READY 8
#define PLUGIN_IS_DYING 16
/* A handle for the dynamic library containing a plugin or plugins. */
struct st_plugin_dl
{
LEX_STRING dl;
void *handle;
struct st_mysql_plugin *plugins;
uint ref_count; /* number of plugins loaded from the library */
};
/* A handle of a plugin */
struct st_plugin_int
{
LEX_STRING name;
struct st_mysql_plugin *plugin;
struct st_plugin_dl *plugin_dl;
uint state;
uint ref_count; /* number of threads using the plugin */
void *data; /* plugin type specific, e.g. handlerton */
MEM_ROOT mem_root; /* memory for dynamic plugin structures */
sys_var *system_vars; /* server variables for this plugin */
};
/*
See intern_plugin_lock() for the explanation for the
conditionally defined plugin_ref type
*/
typedef struct st_plugin_int **plugin_ref;
#define plugin_decl(pi) ((pi)[0]->plugin)
#define plugin_dlib(pi) ((pi)[0]->plugin_dl)
#define plugin_data(pi,cast) ((cast)((pi)[0]->data))
#define plugin_name(pi) (&((pi)[0]->name))
#define plugin_state(pi) ((pi)[0]->state)
#define plugin_equals(p1,p2) ((p1) && (p2) && (p1)[0] == (p2)[0])
typedef int (*plugin_type_init)(struct st_plugin_int *);
extern char *opt_plugin_load;
extern char *opt_plugin_dir_ptr;
extern char opt_plugin_dir[FN_REFLEN];
extern const LEX_STRING plugin_type_names[];
extern int plugin_init(int *argc, char **argv, int init_flags);
extern void plugin_shutdown(void);
extern void my_print_help_inc_plugins(struct my_option *options, uint size);
extern bool plugin_is_ready(const LEX_STRING *name, int type);
#define my_plugin_lock_by_name(A,B,C) plugin_lock_by_name(A,B,C CALLER_INFO)
#define my_plugin_lock_by_name_ci(A,B,C) plugin_lock_by_name(A,B,C ORIG_CALLER_INFO)
#define my_plugin_lock(A,B) plugin_lock(A,B CALLER_INFO)
#define my_plugin_lock_ci(A,B) plugin_lock(A,B ORIG_CALLER_INFO)
extern plugin_ref plugin_lock(THD *thd, plugin_ref *ptr CALLER_INFO_PROTO);
extern plugin_ref plugin_lock_by_name(THD *thd, const LEX_STRING *name,
int type CALLER_INFO_PROTO);
extern void plugin_unlock(THD *thd, plugin_ref plugin);
extern void plugin_unlock_list(THD *thd, plugin_ref *list, uint count);
extern bool mysql_install_plugin(THD *thd, const LEX_STRING *name,
const LEX_STRING *dl);
extern bool mysql_uninstall_plugin(THD *thd, const LEX_STRING *name);
extern bool plugin_register_builtin(struct st_mysql_plugin *plugin);
extern void plugin_thdvar_init(THD *thd);
extern void plugin_thdvar_cleanup(THD *thd);
typedef bool (plugin_foreach_func)(THD *thd,
plugin_ref plugin,
void *arg);
#define plugin_foreach(A,B,C,D) plugin_foreach_with_mask(A,B,C,PLUGIN_IS_READY,D)
extern bool plugin_foreach_with_mask(THD *thd, plugin_foreach_func *func,
int type, uint state_mask, void *arg);
#endif /* DRIZZLE_SERVER_PLUGIN_H */
|