sgmnt_data_ptr_t csd;
node_local_ptr_t cnl;
enum cdb_sc status;
mutex_spin_parms_ptr_t mutex_spin_parms;
udi = FILE_INFO(reg);
csa = &udi->s_addrs;
csd = csa->hdr;
cnl = csa->nl;
if (!csa->now_crit)
{
assert(0 == crit_count);
crit_count++; /* prevent interrupts */
DEBUG_ONLY(locknl = cnl;) /* for DEBUG_ONLY LOCK_HIST macro */
mutex_spin_parms = (mutex_spin_parms_ptr_t)&csd->mutex_spin_parms;
status = mutex_lockwim(reg, mutex_spin_parms, crash_count);
DEBUG_ONLY(locknl = NULL;) /* restore "locknl" to default value */
if (status != cdb_sc_normal)
{
crit_count = 0;
switch (status)
{
case cdb_sc_nolock:
return(FALSE);
case cdb_sc_critreset:
rts_error(VARLSTCNT(4) ERR_CRITRESET, 2, REG_LEN_STR(reg));
case cdb_sc_dbccerr:
rts_error(VARLSTCNT(4) ERR_DBCCERR, 2, REG_LEN_STR(reg));
default:
GTMASSERT;
}
void ccp_reqwm_interrupt(ccp_db_header **pdb)
{
ccp_db_header *db;
sgmnt_addrs *csa;
uint4 status;
assert(lib$ast_in_prog());
db = *pdb;
csa = db->segment;
if (csa == NULL || csa->nl->ccp_state == CCST_CLOSED)
return;
switch (db->wm_iosb.cond)
{
case SS$_DEADLOCK:
ccp_signal_cont(SS$_DEADLOCK);
/* Just try again */
ccp_request_write_mode(db);
return;
case SS$_CANCEL:
/* Lock cancelled by close */
return;
case SS$_VALNOTVALID:
/* Force reads from disk */
db->wm_iosb.valblk[CCP_VALBLK_TRANS_HIST] = 0;
db->last_lk_sequence = db->master_map_start_tn
= 0;
/* Drop through ... */
case SS$_NORMAL:
if (db->wm_iosb.valblk[CCP_VALBLK_TRANS_HIST] == csa->ti->curr_tn + csa->ti->lock_sequence)
{
/* No change to current tn, do not need to update header */
if (csa->now_crit)
{
assert (csa->nl->in_crit == process_id);
csa->nl->in_crit = 0;
(void)mutex_unlockw(csa->critical, csa->critical->crashcnt, &csa->now_crit);
/***** Check error status here? *****/
}
ccp_writedb5(db);
}
else
{
if (csa->nl->in_crit == 0)
{
if (mutex_lockwim(csa->critical, csa->critical->crashcnt, &csa->now_crit) == cdb_sc_normal)
csa->nl->in_crit = process_id; /* now_crit was set by mutex_lockwim */
else
if (csa->nl->in_crit == 0) /***** Why is this re-tested? *****/
{
status = sys$setimr(0, delta_100_msec, ccp_reqwm_interrupt, &db->wmcrit_timer_id,
0);
if (status != SS$_NORMAL)
ccp_signal_cont(status); /***** Is this reasonable? *****/
return;
}
}
status = sys$qio(0, FILE_INFO(db->greg)->fab->fab$l_stv, IO$_READVBLK, &db->qio_iosb, ccp_writedb2, db,
&db->glob_sec->trans_hist, BT_SIZE(csa->hdr) + SIZEOF(th_index), TH_BLOCK, 0, 0, 0);
if (status != SS$_NORMAL)
ccp_signal_cont(status); /***** Is this reasonable? *****/
}
return;
default:
ccp_signal_cont(db->wm_iosb.cond); /***** Is this reasonable? *****/
return;
}
}
/* Note about usage of this function : Create dummy gd_region, gd_segment, file_control,
* unix_db_info, sgmnt_addrs, and allocate mutex_struct (and NUM_CRIT_ENTRY * mutex_que_entry),
* mutex_spin_parms_struct, and node_local in shared memory. Initialize the fields as in
* jnlpool_init(). Pass the address of the dummy region as argument to this function.
*/
boolean_t grab_lock(gd_region *reg, boolean_t is_blocking_wait, uint4 onln_rlbk_action)
{
unix_db_info *udi;
sgmnt_addrs *csa;
enum cdb_sc status;
mutex_spin_parms_ptr_t mutex_spin_parms;
char scndry_msg[OUT_BUFF_SIZE];
# ifdef DEBUG
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
# endif
udi = FILE_INFO(reg);
csa = &udi->s_addrs;
assert(!csa->hold_onto_crit);
assert(!csa->now_crit);
if (!csa->now_crit)
{
assert(0 == crit_count);
crit_count++; /* prevent interrupts */
DEBUG_ONLY(locknl = csa->nl); /* for DEBUG_ONLY LOCK_HIST macro */
mutex_spin_parms = (mutex_spin_parms_ptr_t)((sm_uc_ptr_t)csa->critical + JNLPOOL_CRIT_SPACE);
/* This assumes that mutex_spin_parms_t is located immediately after the crit structures */
/* As of 10/07/98, crashcnt field in mutex_struct is not changed by any function for the dummy region */
if (is_blocking_wait)
status = mutex_lockw(reg, mutex_spin_parms, 0);
else
status = mutex_lockwim(reg, mutex_spin_parms, 0);
DEBUG_ONLY(locknl = NULL); /* restore "locknl" to default value */
if (status != cdb_sc_normal)
{
crit_count = 0;
switch(status)
{
case cdb_sc_critreset: /* As of 10/07/98, this return value is not possible */
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(4) ERR_CRITRESET, 2, REG_LEN_STR(reg));
case cdb_sc_dbccerr:
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(4) ERR_DBCCERR, 2, REG_LEN_STR(reg));
case cdb_sc_nolock:
return FALSE;
default:
assertpro(FALSE && status);
}
return FALSE;
}
/* There is only one case we know of when csa->nl->in_crit can be non-zero and that is when a process holding
* crit gets kill -9ed and another process ends up invoking "secshr_db_clnup" which in turn clears the
* crit semaphore (making it available for waiters) but does not also clear csa->nl->in_crit since it does not
* hold crit at that point. But in that case, the pid reported in csa->nl->in_crit should be dead. Check that.
*/
assert((0 == csa->nl->in_crit) || (FALSE == is_proc_alive(csa->nl->in_crit, 0)));
csa->nl->in_crit = process_id;
CRIT_TRACE(crit_ops_gw); /* see gdsbt.h for comment on placement */
crit_count = 0;
if (jnlpool.repl_inst_filehdr->file_corrupt && !jgbl.onlnrlbk)
{ /* Journal pool indicates an abnormally terminated online rollback. Cannot continue until the rollback
* command is re-run to bring the journal pool/file and instance file to a consistent state.
*/
SNPRINTF(scndry_msg, OUT_BUFF_SIZE, "Instance file header has file_corrupt field set to TRUE");
/* No need to do rel_lock before rts_error (mupip_exit_handler will do it for us) - BYPASSOK rts_error */
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(8) ERR_REPLREQROLLBACK, 2, LEN_AND_STR(udi->fn),
ERR_TEXT, 2, LEN_AND_STR(scndry_msg));
}
/* If ASSERT_NO_ONLINE_ROLLBACK, then no concurrent online rollbacks can happen at this point. So, the jnlpool
* should be in in sync. There are two exceptions. If this is GT.CM GNP Server and the last client disconnected, the
* server invokes gtcmd_rundown which in-turn invokes gds_rundown thereby running down all active databases at this
* point but leaves the journal pool up and running. Now, if an online rollback is attempted, it increments the
* onln_rlbk_cycle in the journal pool, but csa->onln_rlbk_cycle is not synced yet. So, the grab_crit done in t_end
* will NOT detect a concurrent online rollback and it doesn't need to because the rollback happened AFTER the
* rundown. Assert that this is the only case we know of for the cycles to be out-of-sync. In PRO
* jnlpool_ctl->onln_rlbk_cycle is used only by the replication servers (which GT.CM is not) and so even if it
* continues with an out-of-sync csa->onln_rlbk_cycle, t_end logic does the right thing. The other exception is if
* GT.M initialized journal pool while opening database (belonging to a different instance) in gvcst_init (for
* anticipatory freeze) followed by an online rollback which increments the jnlpool_ctl->onln_rlbk_cycle but leaves
* the repl_csa->onln_rlbk_cycle out-of-sync. At this point, if a replicated database is open for the first time,
* we'll reach t_end to commit the update but will end up failing the below assert due to the out-of-sync
* onln_rlbk_cycle. So, assert accordingly. Note : even though the cycles are out-of-sync they are not an issue for
* GT.M because it always relies on the onln_rlbk_cycle from csa->nl and not from repl_csa. But, we don't remove the
* assert as it is valuable for replication servers (Source, Receiver and Update Process).
*/
assert((ASSERT_NO_ONLINE_ROLLBACK != onln_rlbk_action)
|| (csa->onln_rlbk_cycle == jnlpool.jnlpool_ctl->onln_rlbk_cycle) || IS_GTCM_GNP_SERVER_IMAGE
|| (jnlpool_init_needed && INST_FREEZE_ON_ERROR_POLICY));
if ((HANDLE_CONCUR_ONLINE_ROLLBACK == onln_rlbk_action)
&& (csa->onln_rlbk_cycle != jnlpool.jnlpool_ctl->onln_rlbk_cycle))
{
assert(is_src_server);
SYNC_ONLN_RLBK_CYCLES;
gtmsource_onln_rlbk_clnup(); /* side-effect : sets gtmsource_state */
rel_lock(reg); /* caller knows to disconnect and re-establish the connection */
}
}
return TRUE;
}
