diff options
Diffstat (limited to 'storage/xtradb/lock')
| -rw-r--r-- | storage/xtradb/lock/lock0lock.c | 178 |
1 files changed, 100 insertions, 78 deletions
diff --git a/storage/xtradb/lock/lock0lock.c b/storage/xtradb/lock/lock0lock.c index b103ee79578..7ec4a53e0ea 100644 --- a/storage/xtradb/lock/lock0lock.c +++ b/storage/xtradb/lock/lock0lock.c @@ -1733,11 +1733,11 @@ lock_rec_create( Enqueues a waiting request for a lock which cannot be granted immediately. Checks for deadlocks. @return DB_LOCK_WAIT, DB_DEADLOCK, or DB_QUE_THR_SUSPENDED, or -DB_SUCCESS; DB_SUCCESS means that there was a deadlock, but another -transaction was chosen as a victim, and we got the lock immediately: -no need to wait then */ +DB_SUCCESS_LOCKED_REC; DB_SUCCESS_LOCKED_REC means that +there was a deadlock, but another transaction was chosen as a victim, +and we got the lock immediately: no need to wait then */ static -ulint +enum db_err lock_rec_enqueue_waiting( /*=====================*/ ulint type_mode,/*!< in: lock mode this @@ -1811,7 +1811,7 @@ lock_rec_enqueue_waiting( if (trx->wait_lock == NULL) { - return(DB_SUCCESS); + return(DB_SUCCESS_LOCKED_REC); } trx->que_state = TRX_QUE_LOCK_WAIT; @@ -1931,6 +1931,16 @@ somebody_waits: return(lock_rec_create(type_mode, block, heap_no, index, trx)); } +/** Record locking request status */ +enum lock_rec_req_status { + /** Failed to acquire a lock */ + LOCK_REC_FAIL, + /** Succeeded in acquiring a lock (implicit or already acquired) */ + LOCK_REC_SUCCESS, + /** Explicitly created a new lock */ + LOCK_REC_SUCCESS_CREATED +}; + /*********************************************************************//** This is a fast routine for locking a record in the most common cases: there are no explicit locks on the page, or there is just one lock, owned @@ -1938,9 +1948,9 @@ by this transaction, and of the right type_mode. This is a low-level function which does NOT look at implicit locks! Checks lock compatibility within explicit locks. This function sets a normal next-key lock, or in the case of a page supremum record, a gap type lock. -@return TRUE if locking succeeded */ +@return whether the locking succeeded */ UNIV_INLINE -ibool +enum lock_rec_req_status lock_rec_lock_fast( /*===============*/ ibool impl, /*!< in: if TRUE, no lock is set @@ -1979,19 +1989,19 @@ lock_rec_lock_fast( lock_rec_create(mode, block, heap_no, index, trx); } - return(TRUE); + return(LOCK_REC_SUCCESS_CREATED); } if (lock_rec_get_next_on_page(lock)) { - return(FALSE); + return(LOCK_REC_FAIL); } if (lock->trx != trx || lock->type_mode != (mode | LOCK_REC) || lock_rec_get_n_bits(lock) <= heap_no) { - return(FALSE); + return(LOCK_REC_FAIL); } if (!impl) { @@ -2000,10 +2010,11 @@ lock_rec_lock_fast( if (!lock_rec_get_nth_bit(lock, heap_no)) { lock_rec_set_nth_bit(lock, heap_no); + return(LOCK_REC_SUCCESS_CREATED); } } - return(TRUE); + return(LOCK_REC_SUCCESS); } /*********************************************************************//** @@ -2011,9 +2022,10 @@ This is the general, and slower, routine for locking a record. This is a low-level function which does NOT look at implicit locks! Checks lock compatibility within explicit locks. This function sets a normal next-key lock, or in the case of a page supremum record, a gap type lock. -@return DB_SUCCESS, DB_LOCK_WAIT, or error code */ +@return DB_SUCCESS, DB_SUCCESS_LOCKED_REC, DB_LOCK_WAIT, DB_DEADLOCK, +or DB_QUE_THR_SUSPENDED */ static -ulint +enum db_err lock_rec_lock_slow( /*===============*/ ibool impl, /*!< in: if TRUE, no lock is set @@ -2030,7 +2042,6 @@ lock_rec_lock_slow( que_thr_t* thr) /*!< in: query thread */ { trx_t* trx; - ulint err; ut_ad(mutex_own(&kernel_mutex)); ut_ad((LOCK_MODE_MASK & mode) != LOCK_S @@ -2049,27 +2060,23 @@ lock_rec_lock_slow( /* The trx already has a strong enough lock on rec: do nothing */ - err = DB_SUCCESS; } else if (lock_rec_other_has_conflicting(mode, block, heap_no, trx)) { /* If another transaction has a non-gap conflicting request in the queue, as this transaction does not have a lock strong enough already granted on the record, we have to wait. */ - err = lock_rec_enqueue_waiting(mode, block, heap_no, - index, thr); - } else { - if (!impl) { - /* Set the requested lock on the record */ - - lock_rec_add_to_queue(LOCK_REC | mode, block, - heap_no, index, trx); - } + return(lock_rec_enqueue_waiting(mode, block, heap_no, + index, thr)); + } else if (!impl) { + /* Set the requested lock on the record */ - err = DB_SUCCESS; + lock_rec_add_to_queue(LOCK_REC | mode, block, + heap_no, index, trx); + return(DB_SUCCESS_LOCKED_REC); } - return(err); + return(DB_SUCCESS); } /*********************************************************************//** @@ -2078,9 +2085,10 @@ possible, enqueues a waiting lock request. This is a low-level function which does NOT look at implicit locks! Checks lock compatibility within explicit locks. This function sets a normal next-key lock, or in the case of a page supremum record, a gap type lock. -@return DB_SUCCESS, DB_LOCK_WAIT, or error code */ +@return DB_SUCCESS, DB_SUCCESS_LOCKED_REC, DB_LOCK_WAIT, DB_DEADLOCK, +or DB_QUE_THR_SUSPENDED */ static -ulint +enum db_err lock_rec_lock( /*==========*/ ibool impl, /*!< in: if TRUE, no lock is set @@ -2096,8 +2104,6 @@ lock_rec_lock( dict_index_t* index, /*!< in: index of record */ que_thr_t* thr) /*!< in: query thread */ { - ulint err; - ut_ad(mutex_own(&kernel_mutex)); ut_ad((LOCK_MODE_MASK & mode) != LOCK_S || lock_table_has(thr_get_trx(thr), index->table, LOCK_IS)); @@ -2109,18 +2115,20 @@ lock_rec_lock( || mode - (LOCK_MODE_MASK & mode) == LOCK_REC_NOT_GAP || mode - (LOCK_MODE_MASK & mode) == 0); - if (lock_rec_lock_fast(impl, mode, block, heap_no, index, thr)) { - - /* We try a simplified and faster subroutine for the most - common cases */ - - err = DB_SUCCESS; - } else { - err = lock_rec_lock_slow(impl, mode, block, - heap_no, index, thr); + /* We try a simplified and faster subroutine for the most + common cases */ + switch (lock_rec_lock_fast(impl, mode, block, heap_no, index, thr)) { + case LOCK_REC_SUCCESS: + return(DB_SUCCESS); + case LOCK_REC_SUCCESS_CREATED: + return(DB_SUCCESS_LOCKED_REC); + case LOCK_REC_FAIL: + return(lock_rec_lock_slow(impl, mode, block, + heap_no, index, thr)); } - return(err); + ut_error; + return(DB_ERROR); } /*********************************************************************//** @@ -3948,8 +3956,8 @@ lock_rec_unlock( const rec_t* rec, /*!< in: record */ enum lock_mode lock_mode)/*!< in: LOCK_S or LOCK_X */ { + lock_t* first_lock; lock_t* lock; - lock_t* release_lock = NULL; ulint heap_no; ut_ad(trx && rec); @@ -3959,48 +3967,40 @@ lock_rec_unlock( mutex_enter(&kernel_mutex); - lock = lock_rec_get_first(block, heap_no); + first_lock = lock_rec_get_first(block, heap_no); /* Find the last lock with the same lock_mode and transaction from the record. */ - while (lock != NULL) { + for (lock = first_lock; lock != NULL; + lock = lock_rec_get_next(heap_no, lock)) { if (lock->trx == trx && lock_get_mode(lock) == lock_mode) { - release_lock = lock; ut_a(!lock_get_wait(lock)); + lock_rec_reset_nth_bit(lock, heap_no); + goto released; } - - lock = lock_rec_get_next(heap_no, lock); } - /* If a record lock is found, release the record lock */ - - if (UNIV_LIKELY(release_lock != NULL)) { - lock_rec_reset_nth_bit(release_lock, heap_no); - } else { - mutex_exit(&kernel_mutex); - ut_print_timestamp(stderr); - fprintf(stderr, - " InnoDB: Error: unlock row could not" - " find a %lu mode lock on the record\n", - (ulong) lock_mode); + mutex_exit(&kernel_mutex); + ut_print_timestamp(stderr); + fprintf(stderr, + " InnoDB: Error: unlock row could not" + " find a %lu mode lock on the record\n", + (ulong) lock_mode); - return; - } + return; +released: /* Check if we can now grant waiting lock requests */ - lock = lock_rec_get_first(block, heap_no); - - while (lock != NULL) { + for (lock = first_lock; lock != NULL; + lock = lock_rec_get_next(heap_no, lock)) { if (lock_get_wait(lock) && !lock_rec_has_to_wait_in_queue(lock)) { /* Grant the lock */ lock_grant(lock); } - - lock = lock_rec_get_next(heap_no, lock); } mutex_exit(&kernel_mutex); @@ -5095,7 +5095,14 @@ lock_rec_insert_check_and_lock( lock_mutex_exit_kernel(); - if ((err == DB_SUCCESS) && !dict_index_is_clust(index)) { + switch (err) { + case DB_SUCCESS_LOCKED_REC: + err = DB_SUCCESS; + /* fall through */ + case DB_SUCCESS: + if (dict_index_is_clust(index)) { + break; + } /* Update the page max trx id field */ page_update_max_trx_id(block, buf_block_get_page_zip(block), @@ -5218,6 +5225,10 @@ lock_clust_rec_modify_check_and_lock( ut_ad(lock_rec_queue_validate(block, rec, index, offsets)); + if (UNIV_UNLIKELY(err == DB_SUCCESS_LOCKED_REC)) { + err = DB_SUCCESS; + } + return(err); } @@ -5284,22 +5295,27 @@ lock_sec_rec_modify_check_and_lock( } #endif /* UNIV_DEBUG */ - if (err == DB_SUCCESS) { + if (err == DB_SUCCESS || err == DB_SUCCESS_LOCKED_REC) { /* Update the page max trx id field */ + /* It might not be necessary to do this if + err == DB_SUCCESS (no new lock created), + but it should not cost too much performance. */ page_update_max_trx_id(block, buf_block_get_page_zip(block), thr_get_trx(thr)->id, mtr); + err = DB_SUCCESS; } return(err); } /*********************************************************************//** -Like the counterpart for a clustered index below, but now we read a +Like lock_clust_rec_read_check_and_lock(), but reads a secondary index record. -@return DB_SUCCESS, DB_LOCK_WAIT, DB_DEADLOCK, or DB_QUE_THR_SUSPENDED */ +@return DB_SUCCESS, DB_SUCCESS_LOCKED_REC, DB_LOCK_WAIT, DB_DEADLOCK, +or DB_QUE_THR_SUSPENDED */ UNIV_INTERN -ulint +enum db_err lock_sec_rec_read_check_and_lock( /*=============================*/ ulint flags, /*!< in: if BTR_NO_LOCKING_FLAG @@ -5320,8 +5336,8 @@ lock_sec_rec_read_check_and_lock( LOCK_REC_NOT_GAP */ que_thr_t* thr) /*!< in: query thread */ { - ulint err; - ulint heap_no; + enum db_err err; + ulint heap_no; ut_ad(!dict_index_is_clust(index)); ut_ad(block->frame == page_align(rec)); @@ -5372,9 +5388,10 @@ if the query thread should anyway be suspended for some reason; if not, then puts the transaction and the query thread to the lock wait state and inserts a waiting request for a record lock to the lock queue. Sets the requested mode lock on the record. -@return DB_SUCCESS, DB_LOCK_WAIT, DB_DEADLOCK, or DB_QUE_THR_SUSPENDED */ +@return DB_SUCCESS, DB_SUCCESS_LOCKED_REC, DB_LOCK_WAIT, DB_DEADLOCK, +or DB_QUE_THR_SUSPENDED */ UNIV_INTERN -ulint +enum db_err lock_clust_rec_read_check_and_lock( /*===============================*/ ulint flags, /*!< in: if BTR_NO_LOCKING_FLAG @@ -5395,8 +5412,8 @@ lock_clust_rec_read_check_and_lock( LOCK_REC_NOT_GAP */ que_thr_t* thr) /*!< in: query thread */ { - ulint err; - ulint heap_no; + enum db_err err; + ulint heap_no; ut_ad(dict_index_is_clust(index)); ut_ad(block->frame == page_align(rec)); @@ -5467,17 +5484,22 @@ lock_clust_rec_read_check_and_lock_alt( mem_heap_t* tmp_heap = NULL; ulint offsets_[REC_OFFS_NORMAL_SIZE]; ulint* offsets = offsets_; - ulint ret; + ulint err; rec_offs_init(offsets_); offsets = rec_get_offsets(rec, index, offsets, ULINT_UNDEFINED, &tmp_heap); - ret = lock_clust_rec_read_check_and_lock(flags, block, rec, index, + err = lock_clust_rec_read_check_and_lock(flags, block, rec, index, offsets, mode, gap_mode, thr); if (tmp_heap) { mem_heap_free(tmp_heap); } - return(ret); + + if (UNIV_UNLIKELY(err == DB_SUCCESS_LOCKED_REC)) { + err = DB_SUCCESS; + } + + return(err); } /*******************************************************************//** |