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plugin_foreach - don't hold the lock when calling the function

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This commit is contained in:
serg@janus.mylan 2006-09-05 23:59:16 +02:00
parent c7baf60267
commit 29acac81cf
1 changed files with 40 additions and 18 deletions
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58
sql/sql_plugin.cc
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@ -63,6 +63,8 @@ static HASH plugin_hash[MYSQL_MAX_PLUGIN_TYPE_NUM];
static rw_lock_t THR_LOCK_plugin;
static bool initialized= 0;
static int plugin_array_version=0;
/* prototypes */
my_bool plugin_register_builtin(struct st_mysql_plugin *plugin);
void plugin_load(void);
@ -448,6 +450,7 @@ static my_bool plugin_add(const LEX_STRING *name, const LEX_STRING *dl, int repo
tmp.state= PLUGIN_IS_UNINITIALIZED;
if (! (tmp_plugin_ptr= plugin_insert_or_reuse(&tmp)))
goto err;
plugin_array_version++;
if (my_hash_insert(&plugin_hash[plugin->type], (byte*)tmp_plugin_ptr))
{
tmp_plugin_ptr->state= PLUGIN_IS_FREED;
@ -504,6 +507,7 @@ static void plugin_del(const LEX_STRING *name)
hash_delete(&plugin_hash[plugin->plugin->type], (byte*)plugin);
plugin_dl_del(&plugin->plugin_dl->dl);
plugin->state= PLUGIN_IS_FREED;
plugin_array_version++;
}
DBUG_VOID_RETURN;
}
@ -639,7 +643,7 @@ static byte *get_hash_key(const byte *buff, uint *length,
*/
int plugin_init(int skip_dynamic_loading)
{
int i;
uint i;
struct st_mysql_plugin **builtins;
struct st_mysql_plugin *plugin;
DBUG_ENTER("plugin_init");
@ -939,43 +943,61 @@ err:
DBUG_RETURN(TRUE);
}
my_bool plugin_foreach(THD *thd, plugin_foreach_func *func,
int type, void *arg)
{
uint idx;
struct st_plugin_int *plugin;
uint idx, total;
struct st_plugin_int *plugin, **plugins;
int version=plugin_array_version;
DBUG_ENTER("plugin_foreach");
rw_rdlock(&THR_LOCK_plugin);
rw_rdlock(&THR_LOCK_plugin);
if (type == MYSQL_ANY_PLUGIN)
{
for (idx= 0; idx < plugin_array.elements; idx++)
total=plugin_array.elements;
plugins=(struct st_plugin_int **)my_alloca(total*sizeof(*plugins));
for (idx= 0; idx < total; idx++)
{
plugin= dynamic_element(&plugin_array, idx, struct st_plugin_int *);
/* FREED records may have garbage pointers */
if ((plugin->state != PLUGIN_IS_FREED) &&
func(thd, plugin, arg))
goto err;
if (plugin->state == PLUGIN_IS_FREED)
continue;
plugins[idx]= plugin;
}
}
else
{
HASH *hash= &plugin_hash[type];
for (idx= 0; idx < hash->records; idx++)
total=hash->records;
plugins=(struct st_plugin_int **)my_alloca(total*sizeof(*plugins));
for (idx= 0; idx < total; idx++)
{
plugin= (struct st_plugin_int *) hash_element(hash, idx);
if ((plugin->state != PLUGIN_IS_FREED) &&
(plugin->state != PLUGIN_IS_DELETED) &&
func(thd, plugin, arg))
goto err;
if (plugin->state == PLUGIN_IS_FREED)
continue;
plugins[idx]= plugin;
}
}
rw_unlock(&THR_LOCK_plugin);
for (idx= 0; idx < total; idx++)
{
plugin= plugins[idx];
if (unlikely(version != plugin_array_version))
{
rw_rdlock(&THR_LOCK_plugin);
for (uint i=idx; i < total; i++)
if (plugins[i]->state == PLUGIN_IS_FREED)
plugins[i]=0;
rw_unlock(&THR_LOCK_plugin);
}
if (plugin && func(thd, plugin, arg))
goto err;
}
my_afree(plugins);
DBUG_RETURN(FALSE);
err:
rw_unlock(&THR_LOCK_plugin);
my_afree(plugins);
DBUG_RETURN(TRUE);
}