ok
Direktori : /proc/self/root/usr/include/mysql/server/private/ |
Current File : //proc/self/root/usr/include/mysql/server/private/vers_utils.h |
#ifndef VERS_UTILS_INCLUDED #define VERS_UTILS_INCLUDED #include "table.h" #include "sql_class.h" #include "vers_string.h" class MDL_auto_lock { THD *thd; TABLE_LIST &table; bool error; public: MDL_auto_lock(THD *_thd, TABLE_LIST &_table) : thd(_thd), table(_table) { DBUG_ASSERT(thd); MDL_request protection_request; if (thd->global_read_lock.can_acquire_protection()) { error= true; return; } protection_request.init(MDL_key::GLOBAL, "", "", MDL_INTENTION_EXCLUSIVE, MDL_EXPLICIT); error= thd->mdl_context.acquire_lock(&protection_request, thd->variables.lock_wait_timeout); if (error) return; table.mdl_request.init(MDL_key::TABLE, table.db.str, table.table_name.str, MDL_EXCLUSIVE, MDL_EXPLICIT); error= thd->mdl_context.acquire_lock(&table.mdl_request, thd->variables.lock_wait_timeout); thd->mdl_context.release_lock(protection_request.ticket); } ~MDL_auto_lock() { if (!error) { DBUG_ASSERT(table.mdl_request.ticket); thd->mdl_context.release_lock(table.mdl_request.ticket); table.mdl_request.ticket= NULL; } } bool acquire_error() const { return error; } }; #endif // VERS_UTILS_INCLUDED