pwr_tBoolean
sect_Lock (
pwr_tStatus *sts,
sect_sHead *shp,
sect_sMutex *mp
)
{
pwr_tStatus lsts = 1;
#if defined(OS_ELN)
ELN$LOCK_AREA((AREA)shp->area, *mp);
#elif defined(OS_VMS)
{
sect_sMutexEntry *ep;
int i;
/* Get free list entry. */
while ( 1) {
i = _REMQHI(&mp->freeroot, (void **)&ep);
if ( i == 1)
continue;
else if (i == 3)
sleep(1);
else
break;
}
/* Insert in ownership list. */
while ((i = _INSQTI(ep, &mp->ownerroot)) == 1);
if (i == 0) {
/* Contention, we must wait for the resource. */
lsts = sys$ascefc(64, &shp->namedsc, 0, 0);
if (ODD(lsts)) lsts = sys$waitfr(ep->flag);
if (ODD(lsts)) lsts = sys$clref(ep->flag);
}
}
#elif defined(OS_LYNX)
while (sem_wait(mp) != 0) {
if (errno != EINTR) {
perror("sect_Lock: sem_wait ");
lsts = 2;
break;
}
}
#elif defined OS_POSIX
while (posix_sem_wait(mp) != 0) {
if (errno != EINTR) {
perror("sect_Lock: sem_wait ");
lsts = 2;
break;
}
}
#endif
errh_ReturnOrBugcheck(ODD(lsts), sts, lsts, "");
}
pwr_tBoolean
sect_Unlock (
pwr_tStatus *sts,
sect_sHead *shp,
sect_sMutex *mp
)
{
pwr_tStatus lsts = 1;
#if defined(OS_ELN)
ELN$UNLOCK_AREA((AREA)shp->area, *mp);
#elif defined(OS_VMS)
{
sect_sMutexEntry *ep;
pwr_tUInt32 i;
/* When the entry is removed the resource becomes
free if noone else is waiting... */
while ((i = _REMQHI(&mp->ownerroot, (void **)&ep)) == 1);
if (i == 3) {
lsts = LIB$_QUEWASEMP;
} else {
/* Reinsert entry in free list */
while (_INSQTI(ep, &mp->freeroot) == 1);
if (i == 0) {
/* Someone was waiting. */
ep = (sect_sMutexEntry *)(
((pwr_tUInt32)&mp->ownerroot) +
mp->ownerroot.low /* flink */);
lsts = sys$ascefc(64, &shp->namedsc, 0, 0);
if (ODD(lsts)) lsts = sys$setef(ep->flag);
}
}
}
#elif defined(OS_LYNX)
if (sem_post(mp) != 0) {
perror("sect_Unlock: sem_signal ");
lsts = 2;
}
#elif defined OS_POSIX
if (posix_sem_post(mp) != 0) {
perror("sect_Unlock: sem_signal ");
lsts = 2;
}
#endif
errh_ReturnOrBugcheck(ODD(lsts), sts, lsts, "");
}
pwr_tBoolean
sect_InitLock (
pwr_tStatus *sts,
sect_sHead *shp,
sect_sMutex *mp
)
{
pwr_tStatus lsts = 1;
#ifdef OS_ELN
ELN$INITIALIZE_AREA_LOCK((AREA)shp->area, *mp, &lsts);
#elif defined(OS_VMS)
{
pwr_tUInt32 i;
/* Clear mutex variable and build free list. */
memset(mp, 0, sizeof(*mp));
lsts = sys$ascefc(64, &shp->namedsc, 0, 0);
if (ODD(lsts)) {
for (i=0; i<32; i++) {
while (_INSQTI(&mp->list[i].entry, &mp->freeroot) == 1);
mp->list[i].flag = 64+i;
lsts = sys$clref(mp->list[i].flag);
if (EVEN(lsts)) break;
}
}
}
#elif defined(OS_LYNX)
if (sem_init(mp, 1, 1) != 0) {
errh_Error("sect_InitLock: sem_init, errno: %d", errno);
lsts = 2;
}
#elif defined OS_POSIX
if (posix_sem_init_shared(mp, ftok(shp->name, 'P'), 1) != 0) {
errh_Error("sect_InitLock: sem_init(%s), errno: %d", shp->name, errno);
lsts = 2;
}
#endif
errh_ReturnOrBugcheck(ODD(lsts), sts, lsts, "");
}
void bck_ForceBackup (
void **context)
{
pwr_tInt32 sts;
pwr_tTime *t;
#ifdef OS_VMS
$DESCRIPTOR (efcname, BCK_EFC_NAME);
#endif
/*
* Initialize
*/
#ifdef OS_ELN
if (!areas_mapped) {
BCK_MAP_AREAS;
areas_mapped = TRUE;
}
#endif
/*
* Build the context block (i.e. current time)
*/
if (context != NULL) {
t = malloc (sizeof *t);
time_GetTime(t);
*context = t;
}
/*
* Kick the backup processes
*/
#ifdef OS_ELN
ker$signal (NULL, bck_forced_activation);
#else
sts = sys$ascefc (BCK_EFC, &efcname, 0, 0);
if (EVEN (sts)) lib$signal (sts);
sts = sys$setef (BCK_ACTIVATE);
if (EVEN (sts)) lib$signal (sts);
#endif
} /* bck_ForceBackup */
pwr_tUInt32 bck_WaitBackup (
void *context,
pwr_tBoolean timeout)
{
pwr_tUInt32 sts;
pwr_tObjid objid;
pwr_tInt32 c;
pwr_tTime t;
pwr_tVaxTime tmo;
pwr_tVaxTime tmptime;
pwr_sClass_Backup_Conf *backup_confp; /* Backup_Conf object pointer */
$DESCRIPTOR (timeunitdsc, "0 0:0:0.1"); /* 0.1 second units */
int cycletime;
#ifdef OS_ELN
pwr_tInt32 res;
pwr_tVaxTime *tmop;
#endif
#ifdef OS_VMS
$DESCRIPTOR (efcname, BCK_EFC_NAME);
#endif
/*
* Initialize
*/
#ifdef OS_ELN
if (!areas_mapped) {
BCK_MAP_AREAS;
areas_mapped = TRUE;
}
#endif
/*
* Find the local Backup_Conf object
*/
sts = gdh_GetClassList (pwr_cClass_Backup_Conf, &objid);
while (ODD (sts)) {
sts = gdh_ObjidToPointer (objid, (pwr_tAddress *)&backup_confp);
if (ODD (sts)) break;
sts = gdh_GetNextObject (objid, &objid);
}
if (EVEN (sts)) return sts; /* Something wrong, quit */
/*
* Pick up argument information
*/
if (context == NULL) time_GetTime(&t);
else {
t = *(pwr_tTime *)context;
free (context);
}
#ifdef OS_ELN
tmop = NULL;
#else
timed_out = FALSE;
sts = sys$ascefc (BCK_EFC, &efcname, 0, 0);
if (EVEN (sts)) lib$signal (sts); /* BUG */
#endif
if (timeout) {
cycletime = backup_confp->CycleSlow * 2;
if (cycletime == 0) cycletime = BCK_DEFAULT_SLOW * 2;
#ifdef OS_ELN
tmo = eln$time_value (&timeunitdsc);
#else
sts = sys$bintim (&timeunitdsc, &tmo);
if (EVEN (sts)) lib$signal (sts); /* BUG, should not happen */
#endif
lib$mult_delta_time (
&cycletime, /* multiplier */
&tmo); /* delta_time (modified) */
sys$gettim (&tmptime);
lib$add_times (&tmo, &tmptime, &tmo); /* Make absolute time */
#ifdef OS_ELN
tmop = &tmo;
#else
sts = sys$setimr (BCK_WRITE_DONE, &tmo, &astrtn, 4711, 0);
if (EVEN (sts)) lib$signal (sts); /* BUG */
#endif
}
/*
* Loop, and wait for things to happen
*/
while (TRUE) {
#ifdef OS_ELN
ker$clear_event (NULL, bck_write_done);
ker$wait_any (NULL, &res, tmop, bck_write_done);
/* Check for timeout */
if (res == 0) return SS$_TIMEOUT;
#else
sts = sys$clref (BCK_WRITE_DONE);
if (EVEN (sts)) lib$signal (sts); /* BUG */
sts = sys$waitfr (BCK_WRITE_DONE);
if (EVEN (sts)) lib$signal (sts); /* BUG */
/* Check for timeout */
if (timed_out) return SS$_TIMEOUT;
#endif
/* Check if both cycles done */
if (time_Acomp(&backup_confp->ObjTimeSlow, &t) < 0)
continue;
if (time_Acomp(&backup_confp->ObjTimeFast, &t) < 0)
continue;
break;
} /* Loop */
#ifdef OS_VMS
sys$cantim (4711, 0);
#endif
return 1; /* Done. */
} /* bck_WaitBackup */