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MDEV-6712 THD specifics for plugins

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thd_specifics service
This commit is contained in:
Sergei Golubchik
2014-12-03 23:51:47 +01:00
parent 0c7d773fca
commit 8360e1a5b5
11 changed files with 236 additions and 0 deletions
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48
sql/sql_plugin.cc
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@ -4094,3 +4094,51 @@ static void restore_ptr_backup(uint n, st_ptr_backup *backup)
(backup++)->restore();
}
/****************************************************************************
thd specifics service, see include/mysql/service_thd_specifics.h
****************************************************************************/
static const int INVALID_THD_KEY= -1;
static uint thd_key_no = 42;
int thd_key_create(MYSQL_THD_KEY_T *key)
{
int flags= PLUGIN_VAR_THDLOCAL | PLUGIN_VAR_STR |
PLUGIN_VAR_NOSYSVAR | PLUGIN_VAR_NOCMDOPT;
char namebuf[256];
snprintf(namebuf, sizeof(namebuf), "%u", thd_key_no++);
mysql_rwlock_wrlock(&LOCK_system_variables_hash);
// non-letters in the name as an extra safety
st_bookmark *bookmark= register_var("\a\v\a\t\a\r", namebuf, flags);
mysql_rwlock_unlock(&LOCK_system_variables_hash);
if (bookmark)
{
*key= bookmark->offset;
return 0;
}
return ENOMEM;
}
void thd_key_delete(MYSQL_THD_KEY_T *key)
{
*key= INVALID_THD_KEY;
}
void* thd_getspecific(MYSQL_THD thd, MYSQL_THD_KEY_T key)
{
DBUG_ASSERT(key != INVALID_THD_KEY);
if (key == INVALID_THD_KEY || (!thd && !(thd= current_thd)))
return 0;
return *(void**)(intern_sys_var_ptr(thd, key, true));
}
int thd_setspecific(MYSQL_THD thd, MYSQL_THD_KEY_T key, void *value)
{
DBUG_ASSERT(key != INVALID_THD_KEY);
if (key == INVALID_THD_KEY || (!thd && !(thd= current_thd)))
return EINVAL;
memcpy(intern_sys_var_ptr(thd, key, true), &value, sizeof(void*));
return 0;
}