m_ids不包括m_creator_trx_id ut_ad(m_up_limit_id <= m_low_limit_id); if (UT_LIST_GET_LEN(trx_sys->serialisation_list ) > 0) { const trx_t *trx; trx = UT_LIST_GET_FIRST(trx_sys->serialisation_list);
// storage/innobase/trx/trx0trx.cc static inline bool trx_add_to_serialisation_list(trx_t *trx) { . trx_sys_allocate_trx_id_or_no(); } // 生成事务提交号 inline trx_id_t trx_sys_allocate_trx_no() { ut_ad(trx_sys_serialisation_mutex_own
->else 如果当前rw trxid为空 m_ids.clear(); ->if (UT_LIST_GET_LEN(trx_sys->serialisation_list ) > 0) 如果提交中的事务大于0 ->trx = UT_LIST_GET_FIRST(trx_sys->serialisation_list);
. // It also deals with serialisation by using a Codec and having a instance of // the the desired type
. // It also deals with serialisation by using a Codec and having a instance of // the the desired type
生成事务提交号之后,当前正在提交的事务对象(trx)会加入事务子系统(trx_sys)的 serialisation_list 链表的末尾。这个链表中的所有事务,都是正在提交的事务。
purge_queue->top()); //弹出一个 } else { break; } 而事务进入purge_queue是在事务commit的时候调用trx_serialisation_number_get
* schedule(); * } * __set_current_state(TASK_RUNNING); * * If the caller does not need such serialisation
优化内存分配 时间线 reduce the number of allocations in the WatchServer during objects serialisation #108186,
/percona-server-5.7.29-32/storage/innobase/trx/trx0undo.cc:1970 #2 0x0000000001b8b639 in trx_write_serialisation_history { copy_trx_ids(trx_sys->rw_trx_ids); } else { m_ids.clear(); } if (UT_LIST_GET_LEN(trx_sys->serialisation_list ) > 0) { const trx_t* trx; trx = UT_LIST_GET_FIRST(trx_sys->serialisation_list); if (trx->no
MyContract = eth.contract(contract.info.abiDefinition) // extracts info from contract, save the json serialisation
trx_sys->serialisation_list 序列化事务链表,在事务提交阶段,需要先将事务的undo状态设置为完成,在这之前,获得一个全局序列号trx->no,从trx_sys->max_trx_id 当完成undo更新等操作后,再将事务对象同时从serialisation_list和rw_trx_list上移除。 总的来说,mysql_trx_list包含了rw_trx_list上的事务对象,rw_trx_list包含了serialisation_list上的事务对象。
EDIT: I updated the way that I do the JSON serialisation/deserialisation in this post based on feedback
0x7fb0586d6c90, recovery=<optimized out>) at current_thd.h:33 #6 0x0000000002438303 in trx_write_serialisation_history wsrep_wait_for_turn_in_group_commit(wsrep_binlog.cc:468) trx_sys_update_wsrep_checkpoint(current_thd.h:33) trx_write_serialisation_history
TASK_UNINTERRUPTIBLE); * if (do_i_need_to_sleep()) * schedule(); * * If the caller does not need such serialisation
mini-transaction |--------------trx_commit_low |----------------trx_write_serialisation_history
最近最少使用的文件链表 struct rcu_head rcu; struct work_struct destroy_work; struct mutex s_sync_lock; /* sync serialisation
8.3 序列化与反序列化 先看看维基百科怎么定义的序列化: “In computing, serialization (US spelling) or serialisation (UK spelling
break; * * schedule(); * } * __set_current_state(TASK_RUNNING); * * If the caller does not need such serialisation