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Bug#16194302: SUPPORT FOR FLOATING-POINT SYSTEM VARIABLES

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USING THE PLUGIN INTERFACE.

ISSUE: No support for floating-point plugin
       system variables.

SOLUTION: Allowing plugins to define and expose floating-point
          system variables of type double. MYSQL_SYSVAR_DOUBLE
          and MYSQL_THDVAR_DOUBLE are added.

ISSUE: Fractional part of the def, min, max values of system
       variables are ignored.

SOLUTION: Adding functions that are used to store the raw
          representation of a double in the raw bits of unsigned
          longlong in a way that the binary representation
          remains the same.
This commit is contained in:
Ashish Agarwal
2013-05-19 23:38:06 +05:30
parent 5ca36b3b46
commit 0c4f4ff015
8 changed files with 280 additions and 12 deletions
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11
include/mysql/plugin.h
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@ -163,6 +163,7 @@ typedef int (*mysql_show_var_func)(MYSQL_THD, struct st_mysql_show_var*, char *)
#define PLUGIN_VAR_STR 0x0005
#define PLUGIN_VAR_ENUM 0x0006
#define PLUGIN_VAR_SET 0x0007
#define PLUGIN_VAR_DOUBLE 0x0008
#define PLUGIN_VAR_UNSIGNED 0x0080
#define PLUGIN_VAR_THDLOCAL 0x0100 /* Variable is per-connection */
#define PLUGIN_VAR_READONLY 0x0200 /* Server variable is read only */
@ -345,6 +346,11 @@ DECLARE_MYSQL_SYSVAR_TYPELIB(name, unsigned long long) = { \
PLUGIN_VAR_SET | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, typelib }
#define MYSQL_SYSVAR_DOUBLE(name, varname, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_SYSVAR_SIMPLE(name, double) = { \
PLUGIN_VAR_DOUBLE | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, &varname, def, min, max, blk }
#define MYSQL_THDVAR_BOOL(name, opt, comment, check, update, def) \
DECLARE_MYSQL_THDVAR_BASIC(name, char) = { \
PLUGIN_VAR_BOOL | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
@ -395,6 +401,11 @@ DECLARE_MYSQL_THDVAR_TYPELIB(name, unsigned long long) = { \
PLUGIN_VAR_SET | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, NULL, typelib }
#define MYSQL_THDVAR_DOUBLE(name, opt, comment, check, update, def, min, max, blk) \
DECLARE_MYSQL_THDVAR_SIMPLE(name, double) = { \
PLUGIN_VAR_DOUBLE | PLUGIN_VAR_THDLOCAL | ((opt) & PLUGIN_VAR_MASK), \
#name, comment, check, update, -1, def, min, max, blk, NULL }
/* accessor macros */
#define SYSVAR(name) \