MySQL 8.0.29
Source Code Documentation
sql_plugin_ref.h
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1/* Copyright (c) 2015, 2021, Oracle and/or its affiliates.
2
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12 separately licensed software that they have included with MySQL.
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License, version 2.0, for more details.
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21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
22
23#ifndef SQL_PLUGIN_REF_INCLUDED
24#define SQL_PLUGIN_REF_INCLUDED
25
26#include "lex_string.h"
27#include "my_alloc.h"
29#include "prealloced_array.h"
30
31class sys_var;
32struct st_mysql_plugin;
33struct st_plugin_dl;
34
40};
41
42/* A handle of a plugin */
43
45 LEX_CSTRING name{nullptr, 0};
49 uint ref_count{0}; /* number of threads using the plugin */
50 void *data{nullptr}; /* plugin type specific, e.g. handlerton */
51 MEM_ROOT mem_root; /* memory for dynamic plugin structures */
52 sys_var *system_vars{nullptr}; /* server variables for this plugin */
54 PLUGIN_OFF}; /* OFF, ON, FORCE, F+PERMANENT */
55};
56
57/*
58 See intern_plugin_lock() for the explanation for the
59 conditionally defined plugin_ref type
60*/
61
62#ifdef NDEBUG
63typedef struct st_plugin_int *plugin_ref;
64
65inline st_mysql_plugin *plugin_decl(st_plugin_int *ref) { return ref->plugin; }
66inline st_plugin_dl *plugin_dlib(st_plugin_int *ref) { return ref->plugin_dl; }
67template <typename T>
68inline T plugin_data(st_plugin_int *ref) {
69 return static_cast<T>(ref->data);
70}
71inline LEX_CSTRING *plugin_name(st_plugin_int *ref) { return &(ref->name); }
72inline uint plugin_state(st_plugin_int *ref) { return ref->state; }
74 return ref->load_option;
75}
76inline bool plugin_equals(st_plugin_int *ref1, st_plugin_int *ref2) {
77 return ref1 == ref2;
78}
79
80#else
81
82typedef struct st_plugin_int **plugin_ref;
83
85 return ref[0]->plugin;
86}
88 return ref[0]->plugin_dl;
89}
90template <typename T>
92 return static_cast<T>(ref[0]->data);
93}
94inline LEX_CSTRING *plugin_name(st_plugin_int **ref) { return &(ref[0]->name); }
95inline uint plugin_state(st_plugin_int **ref) { return ref[0]->state; }
97 return ref[0]->load_option;
98}
99inline bool plugin_equals(st_plugin_int **ref1, st_plugin_int **ref2) {
100 return ref1 && ref2 && (ref1[0] == ref2[0]);
101}
102#endif
103
104/**
105 @class Plugin_array
106
107 @brief Plugin array helper class.
108*/
109class Plugin_array : public Prealloced_array<plugin_ref, 2> {
110 public:
111 /**
112 Class construction.
113
114 @param psi_key PSI key.
115 */
116 explicit Plugin_array(PSI_memory_key psi_key)
117 : Prealloced_array<plugin_ref, 2>(psi_key) {}
118
119 /**
120 Check, whether the plugin specified by the plugin argument has been
121 already added into the array.
122
123 @param plugin Plugin to check.
124
125 @retval true Plugin has been already added.
126 @retval false There is no plugin in the array.
127 */
128 bool exists(plugin_ref plugin) {
130
131 for (i = begin(); i != end(); ++i)
132 if (plugin_equals(*i, plugin)) return true;
133
134 return false;
135 }
136};
137
138#endif // SQL_PLUGIN_REF_INCLUDED
Plugin array helper class.
Definition: sql_plugin_ref.h:109
Plugin_array(PSI_memory_key psi_key)
Class construction.
Definition: sql_plugin_ref.h:116
bool exists(plugin_ref plugin)
Check, whether the plugin specified by the plugin argument has been already added into the array.
Definition: sql_plugin_ref.h:128
A typesafe replacement for DYNAMIC_ARRAY.
Definition: prealloced_array.h:70
iterator begin()
begin : Returns a pointer to the first element in the array.
Definition: prealloced_array.h:253
iterator end()
Definition: prealloced_array.h:254
A class representing one system variable - that is something that can be accessed as @global....
Definition: set_var.h:104
unsigned int PSI_memory_key
Instrumented memory key.
Definition: psi_memory_bits.h:48
This file follows Google coding style, except for the name MEM_ROOT (which is kept for historical rea...
PT & ref(PT *tp)
Definition: tablespace_impl.cc:358
uint plugin_state(st_plugin_int **ref)
Definition: sql_plugin_ref.h:95
enum_plugin_load_option plugin_load_option(st_plugin_int **ref)
Definition: sql_plugin_ref.h:96
struct st_plugin_int ** plugin_ref
Definition: sql_plugin_ref.h:82
st_mysql_plugin * plugin_decl(st_plugin_int **ref)
Definition: sql_plugin_ref.h:84
T plugin_data(st_plugin_int **ref)
Definition: sql_plugin_ref.h:91
st_plugin_dl * plugin_dlib(st_plugin_int **ref)
Definition: sql_plugin_ref.h:87
LEX_CSTRING * plugin_name(st_plugin_int **ref)
Definition: sql_plugin_ref.h:94
enum_plugin_load_option
Definition: sql_plugin_ref.h:35
@ PLUGIN_OFF
Definition: sql_plugin_ref.h:36
@ PLUGIN_FORCE_PLUS_PERMANENT
Definition: sql_plugin_ref.h:39
@ PLUGIN_FORCE
Definition: sql_plugin_ref.h:38
@ PLUGIN_ON
Definition: sql_plugin_ref.h:37
bool plugin_equals(st_plugin_int **ref1, st_plugin_int **ref2)
Definition: sql_plugin_ref.h:99
The MEM_ROOT is a simple arena, where allocations are carved out of larger blocks.
Definition: my_alloc.h:82
Definition: mysql_lex_string.h:39
Definition: plugin.h:619
Definition: sql_plugin.h:84
Definition: sql_plugin_ref.h:44
uint state
Definition: sql_plugin_ref.h:48
MEM_ROOT mem_root
Definition: sql_plugin_ref.h:51
uint ref_count
Definition: sql_plugin_ref.h:49
void * data
Definition: sql_plugin_ref.h:50
sys_var * system_vars
Definition: sql_plugin_ref.h:52
enum_plugin_load_option load_option
Definition: sql_plugin_ref.h:53
st_mysql_plugin * plugin
Definition: sql_plugin_ref.h:46
st_plugin_dl * plugin_dl
Definition: sql_plugin_ref.h:47
LEX_CSTRING name
Definition: sql_plugin_ref.h:45
unsigned int uint
Definition: uca-dump.cc:29