105 lines
3.3 KiB
C
105 lines
3.3 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 "aswp.h"
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#include "gtm_facility.h"
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#include "fileinfo.h"
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#include "gdsroot.h"
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#include "gdsbt.h"
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#include "gdsfhead.h"
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#include "filestruct.h"
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#include "copy.h"
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#include "interlock.h"
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#include "performcaslatchcheck.h"
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#include "relqop.h"
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#include "wcs_sleep.h"
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#include "caller_id.h"
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#include "rel_quant.h"
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#include "sleep_cnt.h"
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#include "gtmsource_srv_latch.h"
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#include "repl_msg.h"
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#include "gtmsource.h"
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#include "repl_instance.h"
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#include "have_crit.h"
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GBLREF int4 process_id;
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GBLREF int num_additional_processors;
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GBLREF jnlpool_addrs jnlpool;
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#ifdef DEBUG
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GBLREF node_local_ptr_t locknl;
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GBLREF gd_region *gv_cur_region;
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#endif
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/* Note we don't increment fast_lock_count as part of getting the latch and decrement it when releasing it because ROLLBACK
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* can hold onto this latch for a long while and can do updates in this duration and we should NOT have a non-zero fast_lock_count
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* as many places like t_begin/dsk_read have asserts to this effect. It is okay to NOT increment fast_lock_count as ROLLBACK
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* anyways have logic to disable interrupts the moment it starts doing database updates.
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*/
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boolean_t grab_gtmsource_srv_latch(sm_global_latch_ptr_t latch, uint4 max_timeout_in_secs)
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{
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int spins, maxspins, retries, max_retries;
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unix_db_info *udi;
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sgmnt_addrs *repl_csa;
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assert(!have_crit(CRIT_HAVE_ANY_REG));
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udi = FILE_INFO(jnlpool.jnlpool_dummy_reg);
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repl_csa = &udi->s_addrs;
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maxspins = num_additional_processors ? MAX_LOCK_SPINS(LOCK_SPINS, num_additional_processors) : 1;
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max_retries = max_timeout_in_secs * 4 * 1000; /* outer-loop : X minutes, 1 loop in 4 is sleep of 1 ms */
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for (retries = max_retries - 1; 0 < retries; retries--)
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{
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for (spins = maxspins; 0 < spins; spins--)
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{
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assert(latch->u.parts.latch_pid != process_id); /* We better not hold it if trying to get it */
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if (GET_SWAPLOCK(latch))
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{
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DEBUG_ONLY(locknl = repl_csa->nl); /* Use the journal pool to maintain lock history */
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LOCK_HIST("OBTN", latch, process_id, retries);
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DEBUG_ONLY(locknl = NULL);
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return TRUE;
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}
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}
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if (retries & 0x3)
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{ /* On all but every 4th pass, do a simple rel_quant */
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rel_quant();
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} else
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{
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/* On every 4th pass, we bide for awhile */
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wcs_sleep(LOCK_SLEEP);
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if (RETRY_CASLATCH_CUTOFF == (retries % LOCK_TRIES))
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performCASLatchCheck(latch, TRUE);
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}
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}
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DUMP_LOCKHIST();
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assert(FALSE);
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return FALSE;
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}
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boolean_t rel_gtmsource_srv_latch(sm_global_latch_ptr_t latch)
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{
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sgmnt_addrs *repl_csa;
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repl_csa = &FILE_INFO(jnlpool.jnlpool_dummy_reg)->s_addrs;
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DEBUG_ONLY(locknl = repl_csa->nl);
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LOCK_HIST("RLSE", latch, process_id, 0);
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DEBUG_ONLY(locknl = NULL);
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assert(process_id == latch->u.parts.latch_pid);
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RELEASE_SWAPLOCK(latch);
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return TRUE;
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}
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boolean_t gtmsource_srv_latch_held_by_us()
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{
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return (process_id == jnlpool.gtmsource_local->gtmsource_srv_latch.u.parts.latch_pid);
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}
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