116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
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/****************************************************************
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* *
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* Copyright 2012 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include <errno.h>
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#include <sys/sem.h>
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#include "gtm_string.h"
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#include "gdsroot.h"
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#include "gdsblk.h"
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#include "gdsbml.h"
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#include "gdsbt.h"
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#include "gdsfhead.h"
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#include "gdsblkops.h"
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#include "gdscc.h"
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#include "filestruct.h"
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#include "jnl.h"
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#include "min_max.h"
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#include "t_qread.h"
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#include "dse.h"
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#include "gtmmsg.h"
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#include "t_begin.h"
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#include "t_write_map.h"
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#include "t_abort.h"
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#include "t_retry.h"
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#include "t_end.h"
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#include "wbox_test_init.h"
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#include "error.h"
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#include "t_recycled2free.h"
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#include "cdb_sc.h"
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#include "eintr_wrappers.h"
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#include "gtmimagename.h"
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#include "clear_cache_array.h"
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#include "gtmio.h"
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#include "sleep_cnt.h"
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#include "wcs_sleep.h"
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#include "interlock.h"
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#include "gdsbgtr.h"
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#include "copy.h"
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#include "shmpool.h"
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#include "do_semop.h"
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GBLREF uint4 process_id;
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void clear_cache_array(sgmnt_addrs *csa, sgmnt_data_ptr_t csd, gd_region* reg, uint4 new_total, uint4 old_total)
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{
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char *err_msg;
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boolean_t got_lock;
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cache_rec_ptr_t cr;
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cache_rec_ptr_t cr_lo, cr_top, hash_hdr;
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bt_rec_ptr_t bt;
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node_local_ptr_t cnl;
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unix_db_info *udi;
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int semval;
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DCL_THREADGBL_ACCESS;
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SETUP_THREADGBL_ACCESS;
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/* If called from db_init, assure we've grabbed the access semaphor and are the only process attached to the database.
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* Otherwise, we should have crit when called from wcs_recover or mu_truncate. */
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udi = FILE_INFO(reg);
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assert((udi->grabbed_access_sem && (1 == (semval = semctl(udi->semid, 1, GETVAL)))) || csa->now_crit);
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hash_hdr = (cache_rec_ptr_t)csa->acc_meth.bg.cache_state->cache_array;
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cr_lo = hash_hdr + csd->bt_buckets;
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cr_top = cr_lo + csd->n_bts;
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cnl = csa->nl;
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/* CLear all the cached blocks(FREE AND RECYCLED)
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* that are greater than the post-truncate total_blks
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* Done in crit, near the end of truncate.
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*/
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for (cr = cr_lo; cr < cr_top; cr++)
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{
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if (CR_BLKEMPTY != cr->blk && cr->blk >= new_total)
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{
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if ((0 == cr->dirty)
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VMS_ONLY(|| ((0 != cr->iosb.cond) && (0 == cr->bt_index))))
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{ /* cache record has no valid buffer attached, or its contents
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* are in the database, or it has a more recent twin so we don't
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* even have to care how its write terminated
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*/
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cr->cycle++;
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if (CR_BLKEMPTY != cr->blk)
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{
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bt = bt_get(cr->blk);
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if (bt)
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bt->cache_index = CR_NOTVALID;
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}
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cr->blk = BT_NOTVALID; /* -1 */
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/* when cr->blk is empty, ensure no bt points to this cache-record */
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cr->bt_index = 0; /* offset to bt_rec */
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cr->data_invalid = 0; /* process_id */
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cr->dirty = 0;
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cr->flushed_dirty_tn = 0; /* value of dirty at the time of flush */
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cr->in_tend = 0;
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/* release of a shmpool reformat block if the current cache record is pointing to it */
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SHMPOOL_FREE_CR_RFMT_BLOCK(reg, csa, cr);
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WRITE_LATCH_VAL(cr) = LATCH_CLEAR;
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VMS_ONLY(cr->iosb.cond = 0;)
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cr->jnl_addr = 0;
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cr->refer = FALSE;
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cr->stopped = FALSE;
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/* increment number of write cache records in free queue */
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cnl->wc_in_free++;
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}
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}
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}
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}
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