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/* Copyright (c) 2007 PrimeBase Technologies GmbH
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* 2007-10-31 Paul McCullagh
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* The new table cache. Caches all non-index data. This includes the data
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* files and the row pointer files.
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#ifndef __tabcache_h__
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#define __tabcache_h__
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#include "thread_xt.h"
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#include "filesys_xt.h"
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//#define XT_USE_CACHE_DEBUG_SIZES
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//#define XT_NOT_INLINE
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//#define CHECK_DOUBLE_READ
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#ifdef XT_USE_CACHE_DEBUG_SIZES
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#define XT_TC_PAGE_SIZE (4*1024)
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#define XT_TC_SEGMENT_SHIFTS 1
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#define XT_TC_PAGE_SIZE (32*1024)
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#define XT_TC_SEGMENT_SHIFTS 3
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#define XT_TIME_DIFF(start, now) (\
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((xtWord4) (now) < (xtWord4) (start)) ? \
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((xtWord4) 0XFFFFFFFF - ((xtWord4) (start) - (xtWord4) (now))) : \
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((xtWord4) (now) - (xtWord4) (start)))
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#define XT_TC_SEGMENT_COUNT ((off_t) 1 << XT_TC_SEGMENT_SHIFTS)
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#define XT_TC_SEGMENT_MASK (XT_TC_SEGMENT_COUNT - 1)
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typedef struct XTTabCachePage {
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xtWord1 tcp_dirty; /* TRUE if the page is dirty. */
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xtWord1 tcp_seg; /* Segement number of the page. */
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#ifdef XT_CLUSTER_FREE_RECORDS
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xtWord2 tcp_free_rec; /* 0xFFFF if there is no free record in this page. */
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u_int tcp_lock_count; /* Number of read locks on this page. */
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u_int tcp_hash_idx; /* The hash index of the page. */
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u_int tcp_page_idx; /* The page address. */
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u_int tcp_file_id; /* The file id of the page. */
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xtDatabaseID tcp_db_id; /* The ID of the database. */
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xtTableID tcp_tab_id; /* The ID of the table of this cache page. */
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xtWord4 tcp_data_size; /* Size of the data on this page. */
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xtOpSeqNo tcp_op_seq; /* The operation sequence number (dirty pages have a operations sequence) */
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xtWord4 tcp_ru_time; /* If this is in the top 1/4 don't change position in MRU list. */
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struct XTTabCachePage *tcp_next; /* Pointer to next page on hash list, or next free page on free list. */
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struct XTTabCachePage *tcp_mr_used; /* More recently used pages. */
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struct XTTabCachePage *tcp_lr_used; /* Less recently used pages. */
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xtWord1 tcp_data[XT_TC_PAGE_SIZE]; /* This is actually tci_page_size! */
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} XTTabCachePageRec, *XTTabCachePagePtr;
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* Each table has a "table operation sequence". This sequence is incremented by
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* each operation on the table. Each operation in the log is tagged by a
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* The writter threads re-order operations in the log, and write the operations
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* to the database in sequence.
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* It is safe to free a cache page when the sequence number of the cache page,
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* is less than or equal to the written sequence number.
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typedef struct XTTableSeq {
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xtOpSeqNo ts_next_seq; /* The next sequence number for operations on the table. */
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xt_mutex_type ts_ns_lock; /* Lock for the next sequence number. */
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xtBool ts_log_no_op(XTThreadPtr thread, xtTableID tab_id, xtOpSeqNo op_seq);
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/* Return the next operation sequence number. */
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xtOpSeqNo ts_set_op_seq(XTTabCachePagePtr page);
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xtOpSeqNo ts_get_op_seq();
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xtOpSeqNo ts_set_op_seq(XTTabCachePagePtr page)
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xt_lock_mutex_ns(&ts_ns_lock);
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page->tcp_op_seq = seq = ts_next_seq++;
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xt_unlock_mutex_ns(&ts_ns_lock);
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xtOpSeqNo ts_get_op_seq()
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xt_lock_mutex_ns(&ts_ns_lock);
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xt_unlock_mutex_ns(&ts_ns_lock);
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void xt_op_seq_init(XTThreadPtr self) {
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xt_init_mutex_with_autoname(self, &ts_ns_lock);
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void xt_op_seq_set(XTThreadPtr XT_UNUSED(self), xtOpSeqNo n) {
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void xt_op_seq_exit(XTThreadPtr XT_UNUSED(self)) {
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xt_free_mutex(&ts_ns_lock);
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static xtBool xt_op_is_before(register xtOpSeqNo now, register xtOpSeqNo then);
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static inline xtBool xt_op_is_before(register xtOpSeqNo now, register xtOpSeqNo then)
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if ((now - then) > (xtOpSeqNo) 0xFFFFFFFF/2)
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if ((then - now) > (xtOpSeqNo) 0xFFFFFFFF/2)
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} XTTableSeqRec, *XTTableSeqPtr;
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#define TAB_CAC_USE_PTHREAD_RW
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//#define TAB_CAC_USE_PTHREAD_RW
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#define TAB_CAC_USE_XSMUTEX
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//#define IDX_USE_SPINXSLOCK
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#if defined(TAB_CAC_USE_PTHREAD_RW)
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#define TAB_CAC_LOCK_TYPE xt_rwlock_type
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#define TAB_CAC_INIT_LOCK(s, i) xt_init_rwlock_with_autoname(s, i)
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#define TAB_CAC_FREE_LOCK(s, i) xt_free_rwlock(i)
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#define TAB_CAC_READ_LOCK(i, o) xt_slock_rwlock_ns(i)
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#define TAB_CAC_WRITE_LOCK(i, o) xt_xlock_rwlock_ns(i)
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#define TAB_CAC_UNLOCK(i, o) xt_unlock_rwlock_ns(i)
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#elif defined(TAB_CAC_USE_XSMUTEX)
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#define TAB_CAC_LOCK_TYPE XTMutexXSLockRec
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#define TAB_CAC_INIT_LOCK(s, i) xt_xsmutex_init_with_autoname(s, i)
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#define TAB_CAC_FREE_LOCK(s, i) xt_xsmutex_free(s, i)
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#define TAB_CAC_READ_LOCK(i, o) xt_xsmutex_slock(i, o)
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#define TAB_CAC_WRITE_LOCK(i, o) xt_xsmutex_xlock(i, o)
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#define TAB_CAC_UNLOCK(i, o) xt_xsmutex_unlock(i, o)
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#elif defined(TAB_CAC_USE_SPINXSLOCK)
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#define TAB_CAC_LOCK_TYPE XTSpinXSLockRec
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#define TAB_CAC_INIT_LOCK(s, i) xt_spinxslock_init_with_autoname(s, i)
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#define TAB_CAC_FREE_LOCK(s, i) xt_spinxslock_free(s, i)
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#define TAB_CAC_READ_LOCK(i, o) xt_spinxslock_slock(i, o)
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#define TAB_CAC_WRITE_LOCK(i, o) xt_spinxslock_xlock(i, FALSE, o)
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#define TAB_CAC_UNLOCK(i, o) xt_spinxslock_unlock(i, o)
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#error Please define the lock type
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/* A disk cache segment. The cache is divided into a number of segments
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* to improve concurrency.
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typedef struct XTTabCacheSeg {
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TAB_CAC_LOCK_TYPE tcs_lock; /* The cache segment read/write lock. */
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XTTabCachePagePtr *tcs_hash_table;
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size_t tcs_cache_in_use;
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#ifdef CHECK_DOUBLE_READ
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u_int tcs_total_reads;
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u_int tcs_read_not_req;
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} XTTabCacheSegRec, *XTTabCacheSegPtr;
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* The free'er thread has a list of tables to be purged from the cache.
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* If a table is in the list then it is not allowed to fetch a cache page from
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* The free'er thread goes through all the cache, and removes
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* all cache pages for any table in the purge list.
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* When a table has been purged it signals any threads waiting for the
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* purge to complete (this is usually due to a drop table).
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typedef struct XTTabCachePurge {
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int tcp_state; /* The state of the purge. */
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XTTableSeqPtr tcp_tab_seq; /* Identifies the table to be purged from cache. */
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} XTTabCachePurgeRec, *XTTabCachePurgePtr;
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typedef struct XTTabCacheMem {
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xt_mutex_type tcm_lock; /* The public cache lock. */
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xt_cond_type tcm_cond; /* The public cache wait condition. */
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XTTabCacheSegRec tcm_segment[XT_TC_SEGMENT_COUNT];
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XTTabCachePagePtr tcm_lru_page;
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XTTabCachePagePtr tcm_mru_page;
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size_t tcm_approx_page_count;
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size_t tcm_hash_size;
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u_int tcm_writer_thread_count;
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size_t tcm_cache_size;
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size_t tcm_cache_high; /* The high water level of cache allocation. */
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size_t tcm_low_level; /* This is the level to which the freeer will free, once it starts working. */
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size_t tcm_high_level; /* This is the level at which the freeer will start to work (to avoid waiting)! */
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size_t tcm_mid_level; /* At this level the freeer will not sleep if there are threads waiting. */
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/* The free'er thread: */
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struct XTThread *tcm_freeer_thread; /* The freeer thread . */
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xt_mutex_type tcm_freeer_lock; /* The public cache lock. */
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xt_cond_type tcm_freeer_cond; /* The public cache wait condition. */
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u_int tcm_purge_list_len; /* The length of the purge list. */
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XTTabCachePurgePtr tcm_purge_list; /* Non-NULL if a table is to be purged. */
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u_int tcm_threads_waiting; /* Count of the number of threads waiting for the freeer. */
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xtBool tcm_freeer_busy;
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u_int tcm_free_try_count;
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} XTTabCacheMemRec, *XTTabCacheMemPtr;
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* This structure contains the information about a particular table
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* for the cache. Each table has its own page size, row size
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typedef struct XTTabCache {
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struct XTTable *tci_table;
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xtBool tci_rec_file; /* TRUE if this is a record file (handle data), as appossed to a row file. */
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size_t tci_header_size;
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size_t tci_page_size;
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size_t tci_rows_per_page;
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void xt_tc_setup(struct XTTable *tab, xtBool rec_file, size_t head_size, size_t row_size);
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xtBool xt_tc_write(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, size_t offset, size_t size, xtWord1 *data, xtOpSeqNo *op_seq, xtBool read, XTThreadPtr thread);
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xtBool xt_tc_write_cond(XTThreadPtr self, XT_ROW_REC_FILE_PTR file, xtRefID ref_id, xtWord1 new_type, xtOpSeqNo *op_seq, xtXactID xn_id, xtRowID row_id, u_int stat_id, u_int rec_type);
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xtBool xt_tc_read(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, size_t size, xtWord1 *data, XTThreadPtr thread);
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xtBool xt_tc_read_4(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, xtWord4 *data, XTThreadPtr thread);
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xtBool xt_tc_read_page(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, xtWord1 *data, XTThreadPtr thread);
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xtBool xt_tc_get_page(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, xtBool load, XTTabCachePagePtr *page, size_t *offset, XTThreadPtr thread);
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void xt_tc_release_page(XT_ROW_REC_FILE_PTR file, XTTabCachePagePtr page, XTThreadPtr thread);
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xtBool tc_fetch(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, XTTabCacheSegPtr *ret_seg, XTTabCachePagePtr *ret_page, size_t *offset, xtBool read, XTThreadPtr thread);
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xtBool xt_tc_lock_page(XT_ROW_REC_FILE_PTR file, XTTabCachePagePtr *page, xtRefID ref_id, size_t *offset, XTThreadPtr thread);
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void xt_tc_unlock_page(XT_ROW_REC_FILE_PTR file, XTTabCachePagePtr page, xtOpSeqNo *op_seq, XTThreadPtr thread);
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xtBool tc_read_direct(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, size_t size, xtWord1 *data, XTThreadPtr thread);
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xtBool tc_fetch_direct(XT_ROW_REC_FILE_PTR file, xtRefID ref_id, XTTabCacheSegPtr *ret_seg, XTTabCachePagePtr *ret_page, size_t *offset, XTThreadPtr thread);
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} XTTabCacheRec, *XTTabCachePtr;
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extern XTTabCacheMemRec xt_tab_cache;
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void xt_tc_init(XTThreadPtr self, size_t cache_size);
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void xt_tc_exit(XTThreadPtr self);
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void xt_tc_set_cache_size(size_t cache_size);
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xtInt8 xt_tc_get_usage();
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xtInt8 xt_tc_get_size();
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xtInt8 xt_tc_get_high();
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void xt_load_pages(XTThreadPtr self, struct XTOpenTable *ot);
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void xt_check_table_cache(struct XTTable *tab);
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void xt_quit_freeer(XTThreadPtr self);
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void xt_stop_freeer(XTThreadPtr self);
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void xt_start_freeer(XTThreadPtr self);
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void xt_wr_wake_freeer(XTThreadPtr self, struct XTDatabase *db);
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removed
plugin/pbxt/src/tabcache_xt.h
