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/*-------------------------------------------------------------------------
*
* gtm_opt_tables.h
* Declarations of tables used by GTM configuration file.
*
* Portions Copyright (c) 2011, Postgres-XC Development Group
* Portions Copyright (c) 1996-2011, PostgreSQL Global Development Group
*
* src/include/gtm/gtm_opt_tables.h
*
*-------------------------------------------------------------------------
*/
#ifndef GTM_OPT_TABLES_H
#define GTM_OPT_TABLES_H
#include "gtm/gtm_opt.h"
/*
* GUC supports these types of variables:
*/
enum config_type
{
GTMC_BOOL,
GTMC_INT,
GTMC_REAL,
GTMC_STRING,
GTMC_ENUM
};
union config_var_val
{
bool boolval;
int intval;
double realval;
char *stringval;
int enumval;
};
/*
* The actual value of a GUC variable can include a malloc'd opaque struct
* "extra", which is created by its check_hook and used by its assign_hook.
*/
typedef struct config_var_value
{
union config_var_val val;
void *extra;
} config_var_value;
/*
* Stack entry for saving the state a variable had prior to an uncommitted
* transactional change. In GTM, only chance to update options is SIGINT.
*/
typedef enum
{
/* This is almost GtmOptAction, but we need a fourth state for SET+LOCAL */
GTMOPT_SAVE, /* entry caused by function SET option */
GTMOPT_SET, /* entry caused by plain SET command */
GTMOPT_LOCAL, /* entry caused by SET LOCAL command */
GTMOPT_SET_LOCAL /* entry caused by SET then SET LOCAL */
} GtmOptStackState;
typedef struct guc_stack
{
struct guc_stack *prev; /* previous stack item, if any */
int nest_level; /* nesting depth at which we made entry */
GtmOptStackState state; /* see enum above */
GtmOptSource source; /* source of the prior value */
config_var_value prior; /* previous value of variable */
config_var_value masked; /* SET value in a GTMOPT_SET_LOCAL entry */
/* masked value's source must be GTMC_S_SESSION, so no need to store it */
} GtmOptStack;
/*
* Generic fields applicable to all types of variables
*
* The short description should be less than 80 chars in length. Some
* applications may use the long description as well, and will append
* it to the short description. (separated by a newline or '. ')
*
* Note that sourcefile/sourceline are kept here, and not pushed into stacked
* values, although in principle they belong with some stacked value if the
* active value is session- or transaction-local. This is to avoid bloating
* stack entries. We know they are only relevant when source == GTMC_S_FILE.
*/
struct config_generic
{
/* constant fields, must be set correctly in initial value: */
const char *name; /* name of variable - MUST BE FIRST */
GtmOptContext context; /* context required to set the variable */
const char *short_desc; /* short desc. of this variable's purpose */
const char *long_desc; /* long desc. of this variable's purpose */
int flags; /* flag bits, see below */
/* variable fields, initialized at runtime: */
enum config_type vartype; /* type of variable (set only at startup) */
int status; /* status bits, see below */
GtmOptSource reset_source; /* source of the reset_value */
GtmOptSource source; /* source of the current actual value */
GtmOptStack *stack; /* stacked prior values */
void *extra; /* "extra" pointer for current actual value */
char *sourcefile; /* file current setting is from (NULL if not
* file) */
int sourceline; /* line in source file */
};
/* bit values in flags field are defined in guc.h */
/* bit values in status field */
#define GTMOPT_IS_IN_FILE 0x0001 /* found it in config file */
/*
* Caution: the GTMOPT_IS_IN_FILE bit is transient state for ProcessConfigFile.
* Do not assume that its value represents useful information elsewhere.
*/
/* GUC records for specific variable types */
struct config_bool
{
struct config_generic gen;
/* constant fields, must be set correctly in initial value: */
bool *variable;
bool boot_val;
/* variable fields, initialized at runtime: */
bool reset_val;
void *reset_extra;
};
struct config_int
{
struct config_generic gen;
/* constant fields, must be set correctly in initial value: */
int *variable;
int boot_val;
int min;
int max;
/* variable fields, initialized at runtime: */
int reset_val;
void *reset_extra;
};
struct config_real
{
struct config_generic gen;
/* constant fields, must be set correctly in initial value: */
double *variable;
double boot_val;
double min;
double max;
/* variable fields, initialized at runtime: */
double reset_val;
void *reset_extra;
};
struct config_string
{
struct config_generic gen;
/* constant fields, must be set correctly in initial value: */
char **variable;
const char *boot_val;
/* variable fields, initialized at runtime: */
char *reset_val;
void *reset_extra;
};
struct config_enum
{
struct config_generic gen;
/* constant fields, must be set correctly in initial value: */
int *variable;
int boot_val;
const struct config_enum_entry *options;
/* variable fields, initialized at runtime: */
int reset_val;
void *reset_extra;
};
/* constant tables corresponding to enums above and in guc.h */
extern const char *const config_group_names[];
extern const char *const config_type_names[];
extern const char *const GtmOptContext_Names[];
extern const char *const GtmOptSource_Names[];
/* get the current set of variables */
extern struct config_generic **get_guc_variables(void);
extern void build_guc_variables(void);
/* search in enum options */
extern const char *config_enum_lookup_by_value(struct config_enum * record, int val);
extern bool config_enum_lookup_by_name(struct config_enum * record,
const char *value, int *retval);
#endif /* GTM_OPT_TABLES_H */
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