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Nested transactions. There is still much left to do, especially on the

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performance front, but with feature freeze upon us I think it's time to
drive a stake in the ground and say that this will be in 7.5.

Alvaro Herrera, with some help from Tom Lane.
This commit is contained in:
Tom Lane
2004-07-01 00:52:04 +00:00
parent 4c9aa572fa
commit 573a71a5da
74 changed files with 4516 additions and 1144 deletions
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52
src/include/utils/guc_tables.h
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@ -7,12 +7,31 @@
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/utils/guc_tables.h,v 1.11 2004/05/26 15:07:41 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/guc_tables.h,v 1.12 2004/07/01 00:51:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef GUC_TABLES
#define GUC_TABLES 1
#ifndef GUC_TABLES_H
#define GUC_TABLES_H 1
/*
* GUC supports these types of variables:
*/
enum config_type
{
PGC_BOOL,
PGC_INT,
PGC_REAL,
PGC_STRING
};
union config_var_value
{
bool boolval;
int intval;
double realval;
char *stringval;
};
/*
* Groupings to help organize all the run-time options for display
@ -56,15 +75,19 @@ enum config_group
};
/*
* GUC supports these types of variables:
* Stack entry for saving the state of a variable prior to the current
* transaction
*/
enum config_type
typedef struct guc_stack
{
PGC_BOOL,
PGC_INT,
PGC_REAL,
PGC_STRING
};
struct guc_stack *prev; /* previous stack item, if any */
int nest_level; /* nesting depth of cur transaction */
int status; /* previous status bits, see below */
GucSource tentative_source; /* source of the tentative_value */
GucSource source; /* source of the actual value */
union config_var_value tentative_val; /* previous tentative val */
union config_var_value value; /* previous actual value */
} GucStack;
/*
* Generic fields applicable to all types of variables
@ -86,9 +109,9 @@ struct config_generic
enum config_type vartype; /* type of variable (set only at startup) */
int status; /* status bits, see below */
GucSource reset_source; /* source of the reset_value */
GucSource session_source; /* source of the session_value */
GucSource tentative_source; /* source of the tentative_value */
GucSource source; /* source of the current actual value */
GucStack *stack; /* stacked outside-of-transaction states */
};
/* bit values in flags field */
@ -104,6 +127,7 @@ struct config_generic
/* bit values in status field */
#define GUC_HAVE_TENTATIVE 0x0001 /* tentative value is defined */
#define GUC_HAVE_LOCAL 0x0002 /* a SET LOCAL has been executed */
#define GUC_HAVE_STACK 0x0004 /* we have stacked prior value(s) */
/* GUC records for specific variable types */
@ -118,7 +142,6 @@ struct config_bool
GucBoolAssignHook assign_hook;
GucShowHook show_hook;
/* variable fields, initialized at runtime: */
bool session_val;
bool tentative_val;
};
@ -134,7 +157,6 @@ struct config_int
GucIntAssignHook assign_hook;
GucShowHook show_hook;
/* variable fields, initialized at runtime: */
int session_val;
int tentative_val;
};
@ -150,7 +172,6 @@ struct config_real
GucRealAssignHook assign_hook;
GucShowHook show_hook;
/* variable fields, initialized at runtime: */
double session_val;
double tentative_val;
};
@ -165,7 +186,6 @@ struct config_string
GucShowHook show_hook;
/* variable fields, initialized at runtime: */
char *reset_val;
char *session_val;
char *tentative_val;
};
@ -180,4 +200,4 @@ extern struct config_generic **get_guc_variables(void);
extern void build_guc_variables(void);
#endif
#endif /* GUC_TABLES_H */