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WL#2936

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"Server Variables for Plugins"
  Implement support for plugins to declare server variables.
  Demonstrate functionality by removing InnoDB specific code from sql/*
  New feature for HASH - HASH_UNIQUE flag
  New feature for DYNAMIC_ARRAY - initializer accepts preallocated ptr.
  Completed support for plugin reference counting.
This commit is contained in:
antony@ppcg5.local
2007-03-02 08:43:45 -08:00
parent 83a5eac0a4
commit dc24473cb2
62 changed files with 4546 additions and 2154 deletions
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62
sql/sql_plugin.h
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@@ -16,6 +16,17 @@
#ifndef _sql_plugin_h
#define _sql_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
@@ -41,6 +52,7 @@ typedef struct st_mysql_show_var SHOW_VAR;
#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. */
@@ -63,25 +75,57 @@ struct st_plugin_int
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 */
};
#ifdef DBUG_OFF
typedef struct st_plugin_int *plugin_ref;
#define plugin_decl(pi) ((pi)->plugin)
#define plugin_dlib(pi) ((pi)->plugin_dl)
#define plugin_data(pi,cast) ((cast)((pi)->data))
#define plugin_name(pi) (&((pi)->name))
#define plugin_state(pi) ((pi)->state)
#else
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)
#endif
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);
extern int plugin_init(int *argc, char **argv, int init_flags);
extern void plugin_shutdown(void);
extern my_bool plugin_is_ready(const LEX_STRING *name, int type);
extern st_plugin_int *plugin_lock(const LEX_STRING *name, int type);
extern void plugin_unlock(struct st_plugin_int *plugin);
extern my_bool mysql_install_plugin(THD *thd, const LEX_STRING *name, const LEX_STRING *dl);
extern my_bool mysql_uninstall_plugin(THD *thd, const LEX_STRING *name);
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, bool lock_locals);
extern void plugin_thdvar_cleanup(THD *thd);
typedef my_bool (plugin_foreach_func)(THD *thd,
st_plugin_int *plugin,
plugin_ref plugin,
void *arg);
#define plugin_foreach(A,B,C,D) plugin_foreach_with_mask(A,B,C,PLUGIN_IS_READY,D)
extern my_bool plugin_foreach_with_mask(THD *thd, plugin_foreach_func *func,
int type, uint state_mask, void *arg);
extern bool plugin_foreach_with_mask(THD *thd, plugin_foreach_func *func,
int type, uint state_mask, void *arg);
#endif