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Added possibility to detect if libmysqld is restarted

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(Needed to check if memory allocated with mysql_once_init() has been freed)
This commit is contained in:
monty@mysql.com
2004-11-11 00:36:18 +02:00
parent e76438e807
commit 68130e428a
3 changed files with 28 additions and 18 deletions
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38
sql/handler.cc
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@ -110,6 +110,7 @@ TYPELIB tx_isolation_typelib= {array_elements(tx_isolation_names)-1,"",
tx_isolation_names, NULL};
static TYPELIB known_extensions= {0,"known_exts", NULL, NULL};
uint known_extensions_id= 0;
enum db_type ha_resolve_by_name(const char *name, uint namelen)
{
@ -1635,6 +1636,7 @@ int handler::index_read_idx(byte * buf, uint index, const byte * key,
return error;
}
/*
Returns a list of all known extensions.
@ -1643,20 +1645,24 @@ int handler::index_read_idx(byte * buf, uint index, const byte * key,
NOTES
No mutexes, worst case race is a minor surplus memory allocation
We have to recreate the extension map if mysqld is restarted (for example
within libmysqld)
RETURN VALUE
pointer pointer to TYPELIB structure
*/
TYPELIB *ha_known_exts(void)
{
if (!known_extensions.type_names)
if (!known_extensions.type_names || mysys_usage_id != known_extensions_id)
{
show_table_type_st *types;
List<char> found_exts;
List_iterator_fast<char> it(found_exts);
const char *e, **ext;
found_exts.push_back(".db");
const char **ext, *old_ext;
known_extensions_id= mysys_usage_id;
found_exts.push_back((char*) ".db");
for (types= sys_table_types; types->type; types++)
{
if (*types->value == SHOW_OPTION_YES)
@ -1664,28 +1670,30 @@ TYPELIB *ha_known_exts(void)
handler *file= get_new_handler(0,(enum db_type) types->db_type);
for (ext= file->bas_ext(); *ext; ext++)
{
while (e=it++)
if (e == *ext)
while ((old_ext= it++))
{
if (!strcmp(old_ext, *ext))
break;
if (!e)
found_exts.push_back((char *)*ext);
}
if (!old_ext)
found_exts.push_back((char *) *ext);
it.rewind();
}
delete file;
}
}
ext= (const char **)my_once_alloc(sizeof(char *)*
(found_exts.elements+1), MYF(MY_WME));
ext= (const char **) my_once_alloc(sizeof(char *)*
(found_exts.elements+1),
MYF(MY_WME | MY_FAE));
DBUG_ASSERT(ext);
for (uint i=0; e=it++; i++)
ext[i]= e;
ext[found_exts.elements]= 0;
known_extensions.count= found_exts.elements;
known_extensions.type_names= ext;
while ((old_ext= it++))
*ext++= old_ext;
*ext= 0;
}
return &known_extensions;
}