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13dcdb0903
srv_sys_t::n_threads_active[]: Protect writes by both the mutex and by atomic memory access. srv_active_wake_master_thread_low(): Reliably wake up the master thread if there is work to do. The trick is to atomically read srv_sys->n_threads_active[]. srv_wake_purge_thread_if_not_active(): Atomically read srv_sys->n_threads_active[] (and trx_sys->rseg_history_len), so that the purge should always be triggered when there is work to do. trx_commit_in_memory(): Invoke srv_wake_purge_thread_if_not_active() whenever a transaction is committed. Purge could have been prevented by the read view of the currently committing transaction, even if it is a read-only transaction. trx_purge_add_update_undo_to_history(): Do not wake up the purge. This is only called by trx_undo_update_cleanup(), as part of trx_write_serialisation_history(), which in turn is only called by trx_commit_low() which will always call trx_commit_in_memory(). Thus, the added call in trx_commit_in_memory() will cover also this use case where a committing read-write transaction added some update_undo log to the purge queue. trx_rseg_mem_restore(): Atomically modify trx_sys->rseg_history_len. |
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| .. | ||
| trx0i_s.cc | ||
| trx0purge.cc | ||
| trx0rec.cc | ||
| trx0roll.cc | ||
| trx0rseg.cc | ||
| trx0sys.cc | ||
| trx0trx.cc | ||
| trx0undo.cc | ||