void rel_crit(gd_region *reg)
{
unix_db_info *udi;
sgmnt_addrs *csa;
enum cdb_sc status;
error_def(ERR_CRITRESET);
error_def(ERR_DBCCERR);
udi = FILE_INFO(reg);
csa = &udi->s_addrs;
assert(!hold_onto_locks && !csa->hold_onto_crit);
if (csa->now_crit)
{
assert(0 == crit_count);
crit_count++; /* prevent interrupts */
assert(csa->nl->in_crit == process_id || csa->nl->in_crit == 0);
CRIT_TRACE(crit_ops_rw); /* see gdsbt.h for comment on placement */
csa->nl->in_crit = 0;
DEBUG_ONLY(locknl = csa->nl;) /* for DEBUG_ONLY LOCK_HIST macro */
void rel_crit(gd_region *reg)
{
unix_db_info *udi;
sgmnt_addrs *csa;
enum cdb_sc status;
udi = FILE_INFO(reg);
csa = &udi->s_addrs;
/* Assert that we never come into rel_crit with hold_onto_crit being TRUE. The only exception is for online rollback
* when it is done with the actual rollback and is now in mur_close_files to release crit. At this point it will have
* hold_onto_crit set to TRUE.
*/
assert(!csa->hold_onto_crit || (process_exiting && jgbl.onlnrlbk) || (IS_DSE_IMAGE && !csa->dse_crit_seize_done));
if (csa->now_crit)
{
assert(0 == crit_count);
crit_count++; /* prevent interrupts */
assert(csa->nl->in_crit == process_id || csa->nl->in_crit == 0);
CRIT_TRACE(crit_ops_rw); /* see gdsbt.h for comment on placement */
csa->nl->in_crit = 0;
DEBUG_ONLY(locknl = csa->nl;) /* for DEBUG_ONLY LOCK_HIST macro */
void grab_crit(gd_region *reg)
{
unsigned short cycle_count, cycle;
ccp_action_aux_value msg;
sgmnt_addrs *csa;
sgmnt_data_ptr_t csd;
node_local_ptr_t cnl;
enum cdb_sc status;
csa = &FILE_INFO(reg)->s_addrs;
csd = csa->hdr;
cnl = csa->nl;
assert(!lib$ast_in_prog());
if (!csa->now_crit)
{
assert(0 == crit_count);
crit_count++;
if (csd->clustered)
{
/* For an explanation of the code dealing with clusters, see CCP_EXITWM_ATTEMPT.C.
Please do not change this code without updating the comments in that file. */
cycle = cnl->ccp_cycle;
while (!CCP_SEGMENT_STATE(cnl, CCST_MASK_WRITE_MODE))
{
(void)ccp_sendmsg(CCTR_WRITEDB, &FILE_INFO(reg)->file_id);
(void)ccp_userwait(reg, CCST_MASK_WRITE_MODE, 0, cycle);
cycle = cnl->ccp_cycle;
}
}
if (cdb_sc_normal !=
(status = MUTEX_LOCKW(csa->critical, crash_count, &csa->now_crit, &csd->mutex_spin_parms)))
{
crit_count = 0;
switch (status)
{
case cdb_sc_critreset:
rts_error(ERR_CRITRESET, 2, REG_LEN_STR(reg));
case cdb_sc_dbccerr:
rts_error(ERR_DBCCERR, 2, REG_LEN_STR(reg));
default:
GTMASSERT;
}
return;
}
assert(cnl->in_crit == 0);
cnl->in_crit = process_id;
CRIT_TRACE(crit_ops_gw); /* see gdsbt.h for comment on placement */
if (csd->clustered)
{
cycle = cnl->ccp_cycle;
if (cnl->ccp_crit_blocked)
{
msg.exreq.fid = FILE_INFO(reg)->file_id;
msg.exreq.cycle = cycle;
(void)ccp_sendmsg(CCTR_EXITWM, &msg);
(void)ccp_userwait(reg, ~(CCST_MASK_WRITE_MODE), 0, msg.exreq.cycle);
while (cnl->ccp_crit_blocked && cnl->ccp_cycle == msg.exreq.cycle ||
!CCP_SEGMENT_STATE(cnl, CCST_MASK_WRITE_MODE))
{
cycle = cnl->ccp_cycle;
(void)ccp_sendmsg(CCTR_WRITEDB, &FILE_INFO(reg)->file_id);
(void)ccp_userwait(reg, CCST_MASK_WRITE_MODE, 0, cycle);
}
}
}
crit_count = 0;
}
if (cnl->wc_blocked)
wcs_recover(reg);
}
/* 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;
}
