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911 lines (717 loc) · 21.9 KB
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/* Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@vu.nl
WWW: http://www.swi-prolog.org
Copyright (c) 2011-2017, VU University Amsterdam
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
RDF-DB query management. This module keeps track of running queries. We
need this for GC purposes. In particular, we need to:
* Find the oldest active generation.
* Get a signal if all currently active queries have finished.
In addition to queries, this module performs the necessary logic on
generations:
* Is an object visible in a query?
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <SWI-Stream.h>
#include <SWI-Prolog.h>
#include <string.h>
#include <assert.h>
#include "rdf_db.h"
#include "query.h"
#include "memory.h"
#include "mutex.h"
#include "buffer.h"
static void init_query_stack(rdf_db *db, query_stack *qs);
/*******************************
* THREAD DATA *
*******************************/
/* Return the per-thread data for the given DB. This version uses no
locks for the common case that the required datastructures are
already provided.
*/
thread_info *
rdf_thread_info(rdf_db *db, int tid)
{ query_admin *qa = &db->queries;
per_thread *td = &qa->query.per_thread;
thread_info *ti;
size_t idx = MSB(tid);
if ( !td->blocks[idx] )
{ simpleMutexLock(&qa->query.lock);
if ( !td->blocks[idx] )
{ size_t bs = BLOCKLEN(idx);
thread_info **newblock = rdf_malloc(db, bs*sizeof(thread_info*));
memset(newblock, 0, bs*sizeof(thread_info*));
td->blocks[idx] = newblock-bs;
}
simpleMutexUnlock(&qa->query.lock);
}
if ( !(ti=td->blocks[idx][tid]) )
{ simpleMutexLock(&qa->query.lock);
if ( !(ti=td->blocks[idx][tid]) )
{ ti = rdf_malloc(db, sizeof(*ti));
memset(ti, 0, sizeof(*ti));
init_query_stack(db, &ti->queries);
MEMORY_BARRIER();
td->blocks[idx][tid] = ti;
if ( tid > qa->query.thread_max )
qa->query.thread_max = tid;
}
simpleMutexUnlock(&qa->query.lock);
}
return ti;
}
gen_t
oldest_query_geneneration(rdf_db *db, gen_t *reindex_gen)
{ int tid;
gen_t gen = db->snapshots.keep;
gen_t ren = GEN_MAX;
query_admin *qa = &db->queries;
per_thread *td = &qa->query.per_thread;
DEBUG(20,
if ( db->snapshots.keep != GEN_MAX )
{ char buf[64];
Sdprintf("Oldest snapshot gen = %s\n",
gen_name(db->snapshots.keep, buf));
});
for(tid=1; tid <= qa->query.thread_max; tid++)
{ thread_info **tis;
thread_info *ti;
if ( (tis=td->blocks[MSB(tid)]) &&
(ti=tis[tid]) )
{ query_stack *qs = &ti->queries;
if ( qs->top > 0 )
{ query *q = &qs->preallocated[0];
DEBUG(10,
{ char buf[20];
Sdprintf("Thread %d: %d queries; oldest gen %s\n",
tid, qs->top, gen_name(q->rd_gen, buf));
});
if ( q->rd_gen < gen )
gen = q->rd_gen;
if ( q->reindex_gen < ren )
ren = q->reindex_gen;
} else
{ DEBUG(11, Sdprintf("Thread %d: no queries\n", tid));
}
}
}
if ( reindex_gen )
*reindex_gen = ren;
return gen;
}
/*******************************
* QUERY-STACK *
*******************************/
static void
preinit_query(rdf_db *db, query_stack *qs, query *q, query *parent, int depth)
{ q->db = db;
q->stack = qs;
q->parent = q;
q->depth = depth;
}
static void
init_query_stack(rdf_db *db, query_stack *qs)
{ int tid = PL_thread_self();
int i;
int prealloc = sizeof(qs->preallocated)/sizeof(qs->preallocated[0]);
query *parent = NULL;
memset(qs, 0, sizeof(*qs));
simpleMutexInit(&qs->lock);
qs->db = db;
qs->tr_gen_base = GEN_TBASE + tid*GEN_TNEST;
qs->tr_gen_max = qs->tr_gen_base + (GEN_TNEST-1);
for(i=0; i<MSB(prealloc); i++)
qs->blocks[i] = qs->preallocated;
for(i=0; i<prealloc; i++)
{ query *q = &qs->preallocated[i];
preinit_query(db, qs, q, parent, i);
parent = q;
}
}
static query *
alloc_query(query_stack *qs)
{ int depth = qs->top;
int b = MSB(depth);
if ( b >= MAX_QBLOCKS )
{ PL_resource_error("open_rdf_queries");
return NULL;
}
if ( qs->blocks[b] )
{ query *q = &qs->blocks[b][depth];
assert(q->stack);
return q;
}
simpleMutexLock(&qs->lock);
if ( !qs->blocks[b] )
{ size_t bytes = BLOCKLEN(b) * sizeof(query);
query *ql = rdf_malloc(qs->db, bytes);
query *parent;
int i;
if ( !ql )
{ simpleMutexUnlock(&qs->lock);
PL_resource_error("memory");
return NULL;
}
memset(ql, 0, bytes);
ql -= depth; /* rebase */
parent = &qs->blocks[b-1][depth-1];
for(i=depth; i<depth*2; i++)
{ query *q = &ql[i];
preinit_query(qs->db, qs, q, parent, i);
parent = q;
}
MEMORY_BARRIER();
qs->blocks[b] = ql;
}
simpleMutexUnlock(&qs->lock);
return &qs->blocks[b][depth];
}
static void
push_query(rdf_db *db, query *q)
{ enter_scan(&db->defer_all);
q->stack->top++;
}
static void
pop_query(rdf_db *db, query *q)
{ q->stack->top--;
exit_scan(&db->defer_all);
}
query *
open_query(rdf_db *db)
{ int tid = PL_thread_self();
thread_info *ti = rdf_thread_info(db, tid);
query *q = alloc_query(&ti->queries);
if ( !q ) return NULL;
q->type = Q_NORMAL;
q->transaction = ti->queries.transaction;
q->reindex_gen = db->reindexed;
if ( q->transaction ) /* Query inside a transaction */
{ q->rd_gen = q->transaction->rd_gen;
q->tr_gen = q->transaction->wr_gen;
q->wr_gen = q->transaction->wr_gen;
} else
{ q->rd_gen = db->queries.generation;
q->tr_gen = GEN_TBASE;
q->wr_gen = GEN_UNDEF;
}
push_query(db, q);
return q;
}
query *
open_transaction(rdf_db *db,
triple_buffer *added,
triple_buffer *deleted,
triple_buffer *updated,
snapshot *ss)
{ int tid = PL_thread_self();
thread_info *ti = rdf_thread_info(db, tid);
query *q = alloc_query(&ti->queries);
if ( !q ) return NULL;
q->type = Q_TRANSACTION;
q->transaction = ti->queries.transaction;
q->reindex_gen = GEN_MAX; /* should not get this down */
if ( ss && ss != SNAPSHOT_ANONYMOUS )
{ int ss_tid = snapshot_thread(ss);
assert(!ss_tid || ss_tid == tid);
(void)ss_tid;
q->rd_gen = ss->rd_gen;
q->tr_gen = ss->tr_gen;
} else if ( q->transaction ) /* nested transaction */
{ q->rd_gen = q->transaction->rd_gen;
q->tr_gen = q->transaction->wr_gen;
} else
{ q->rd_gen = db->queries.generation;
q->tr_gen = ti->queries.tr_gen_base;
}
q->wr_gen = q->tr_gen;
ti->queries.transaction = q;
init_triple_buffer(added);
init_triple_buffer(deleted);
init_triple_buffer(updated);
q->transaction_data.added = added;
q->transaction_data.deleted = deleted;
q->transaction_data.updated = updated;
push_query(db, q);
return q;
}
void
close_query(query *q)
{ pop_query(q->db, q);
}
int
empty_transaction(query *q)
{ return ( is_empty_buffer(q->transaction_data.added) &&
is_empty_buffer(q->transaction_data.deleted) &&
is_empty_buffer(q->transaction_data.updated) );
}
/*******************************
* ADMIN *
*******************************/
void
init_query_admin(rdf_db *db)
{ query_admin *qa = &db->queries;
memset(qa, 0, sizeof(*qa));
simpleMutexInit(&qa->query.lock);
simpleMutexInit(&qa->write.lock);
simpleMutexInit(&qa->write.generation_lock);
}
/*******************************
* GENERATIONS *
*******************************/
/* lifespan() is true if a lifespan is visible inside a query.
A lifespan is alive if the query generation is inside it,
but with transactions there are two problems:
- If the triple is deleted by a parent transaction it is dead
- If the triple is created by a parent transaction it is alive
*/
char *
gen_name(gen_t gen, char *buf)
{ static char tmp[24];
if ( !buf )
buf = tmp;
if ( gen == GEN_UNDEF ) return "GEN_UNDEF";
if ( gen == GEN_MAX ) return "GEN_MAX";
if ( gen == GEN_PREHIST ) return "GEN_PREHIST";
if ( gen >= GEN_TBASE )
{ int tid = (int)((gen-GEN_TBASE)/GEN_TNEST);
gen_t r = (gen-GEN_TBASE)%GEN_TNEST;
if ( r == GEN_TNEST-1 )
Ssprintf(buf, "T%d+GEN_TNEST", tid);
else
Ssprintf(buf, "T%d+%" PRId64, tid, (int64_t)r);
return buf;
}
Ssprintf(buf, "%" PRId64, (int64_t)gen);
return buf;
}
int
alive_lifespan(query *q, lifespan *lifespan)
{ DEBUG(2,
{ char b[4][24];
Sdprintf("q: rd_gen=%s; tr_gen=%s; t: %s..%s\n",
gen_name(q->rd_gen, b[0]),
gen_name(q->tr_gen, b[1]),
gen_name(lifespan->born, b[2]),
gen_name(lifespan->died, b[3]));
});
if ( q->rd_gen >= lifespan->born &&
q->rd_gen < lifespan->died )
{ if ( is_wr_transaction_gen(q, lifespan->died) &&
q->tr_gen >= lifespan->died )
return FALSE;
return TRUE;
} else /* created/died in transaction */
{ if ( is_wr_transaction_gen(q, lifespan->born) )
{ if ( q->tr_gen >= lifespan->born &&
q->tr_gen < lifespan->died )
return TRUE;
}
}
return FALSE;
}
int
born_lifespan(query *q, lifespan *lifespan)
{ if ( q->rd_gen >= lifespan->born )
return TRUE;
if ( is_wr_transaction_gen(q, lifespan->born) &&
q->tr_gen >= lifespan->born )
return TRUE;
return FALSE;
}
/*******************************
* TRIPLE MANIPULATION *
*******************************/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
We have three basic triple manipulations:
- Add triples
- Delete triples
- Updated triples (expressed as deleting and adding)
add_triples() adds an array of triples to the database, stepping the
database generation by 1. Calls to add triples must be synchronized with
other addition calls, but not with read nor delete operations. This
synchronization is needed because without we cannot set the generation
for new queries to a proper value.
To reduce the locked time, we perform this in multiple steps:
- prelink_triple() performs tasks that do not affect the remainder of
the database.
- In the link-phase, we add the triples in packages of ADD_CHUNK_SIZE
to the database, but addressed in the far future. No reader sees
see what we are doing.
- Next, we grab the generation_lock and update the triples to
the next generation and increment the generation to make them
visible.
- Finally, we do some post-hock work to update statistics.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#define ADD_CHUNK_SIZE 50
int
add_triples(query *q, triple **triples, size_t count)
{ rdf_db *db = q->db;
gen_t gen, gen_max;
triple **ep = triples+count;
triple **tp;
/* pre-lock phase */
for(tp=triples; tp < ep; tp++)
prelink_triple(db, *tp, q);
consider_triple_rehash(db, count);
/* Add the triples in the future */
gen_max = query_max_gen(q);
for(tp=triples; tp < ep; )
{ triple **echunk = tp+50;
if ( echunk > ep )
echunk = ep;
simpleMutexLock(&db->queries.write.lock);
for(; tp<echunk; tp++)
{ triple *t = *tp;
t->lifespan.born = gen_max;
t->lifespan.died = gen_max;
link_triple(db, t, q);
}
simpleMutexUnlock(&db->queries.write.lock);
}
/* generation update */
simpleMutexLock(&db->queries.write.generation_lock);
gen = queryWriteGen(q)+1;
for(tp=triples; tp < ep; tp++)
{ triple *t = *tp;
t->lifespan.born = gen;
}
setWriteGen(q, gen);
simpleMutexUnlock(&db->queries.write.generation_lock);
if ( q->transaction )
{ for(tp=triples; tp < ep; tp++)
{ triple *t = *tp;
postlink_triple(db, t, q);
buffer_triple(q->transaction->transaction_data.added, t);
}
} else
{ for(tp=triples; tp < ep; tp++)
{ triple *t = *tp;
postlink_triple(db, t, q);
}
if ( rdf_is_broadcasting(EV_ASSERT|EV_ASSERT_LOAD) )
{ for(tp=triples; tp < ep; tp++)
{ triple *t = *tp;
broadcast_id id = t->loaded ? EV_ASSERT_LOAD : EV_ASSERT;
if ( !rdf_broadcast(id, t, NULL) )
return FALSE;
}
}
}
return TRUE;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
del_triples() deletes triples from the database. There are two actions:
- del_triple_consequences() deletes (entailment) consequences of
erasing the triple. Currently this is handling subPropertyOf
entailment. This doesn't remove the triple, but merely invalidates
the subPropertyOf reachability matrix for subsequent generations.
- erase_triple() is called on the final commit and updates statistics.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
del_triples(query *q, triple **triples, size_t count)
{ rdf_db *db = q->db;
gen_t gen;
triple **ep = triples+count;
triple **tp;
if ( count == 0 )
return TRUE;
else
rdf_create_gc_thread(db);
simpleMutexLock(&db->queries.write.generation_lock);
simpleMutexLock(&db->queries.write.lock);
gen = queryWriteGen(q) + 1;
for(tp=triples; tp < ep; tp++)
{ triple *t = deref_triple(db, *tp);
t->lifespan.died = gen;
del_triple_consequences(db, t, q);
if ( q->transaction )
buffer_triple(q->transaction->transaction_data.deleted, t);
else
erase_triple(db, t, q);
}
setWriteGen(q, gen);
simpleMutexUnlock(&db->queries.write.lock);
simpleMutexUnlock(&db->queries.write.generation_lock);
if ( !q->transaction && rdf_is_broadcasting(EV_RETRACT) )
{ for(tp=triples; tp < ep; tp++)
{ triple *t = deref_triple(db, *tp);
if ( !rdf_broadcast(EV_RETRACT, t, NULL) )
return FALSE;
}
}
return TRUE;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
update_triples() updates an array of triples.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
int
update_triples(query *q,
triple **old, triple **new,
size_t count)
{ rdf_db *db = q->db;
gen_t gen, gen_max;
triple **eo = old+count;
triple **en = new+count;
triple **to, **tn;
size_t updated = 0;
if ( count == 0 )
return TRUE;
else
rdf_create_gc_thread(db);
for(tn=new; tn < en; tn++)
{ triple *t = *tn;
if ( t )
prelink_triple(db, t, q);
}
simpleMutexLock(&db->queries.write.generation_lock);
simpleMutexLock(&db->queries.write.lock);
gen = queryWriteGen(q) + 1;
gen_max = query_max_gen(q);
for(to=old,tn=new; to < eo; to++,tn++)
{ if ( *tn )
{ triple *n = *tn; /* new, cannot be reindexed */
triple *o = deref_triple(db, *to);
o->lifespan.died = gen;
n->lifespan.born = gen;
n->lifespan.died = gen_max;
link_triple(db, *tn, q);
del_triple_consequences(db, o, q);
if ( q->transaction )
{ buffer_triple(q->transaction->transaction_data.updated, *to);
buffer_triple(q->transaction->transaction_data.updated, *tn);
} else
{ erase_triple(db, *to, q);
}
updated++;
}
}
(void)updated;
setWriteGen(q, gen);
simpleMutexUnlock(&db->queries.write.lock);
simpleMutexUnlock(&db->queries.write.generation_lock);
consider_triple_rehash(db, 1);
if ( !q->transaction && rdf_is_broadcasting(EV_UPDATE) )
{ for(to=old,tn=new; to < eo; to++,tn++)
{ triple *t = *tn;
if ( t )
{ postlink_triple(db, *tn, q);
if ( !rdf_broadcast(EV_UPDATE, *to, *tn) )
return FALSE;
}
}
} else
{ for(tn=new; tn < en; tn++)
{ triple *t = *tn;
if ( t )
postlink_triple(db, t, q);
}
}
return TRUE;
}
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Matrices used in a transaction must be discarded because a new
transaction will use the same generation numbers, but typically for
different modifications.
TBD: Hand some statistics to GC, such that we know that there are
matrices to collect.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
static void
invalidate_lifespans_transaction(query *q)
{ cell *c, *next;
for(c=q->transaction_data.lifespans.head; c; c=next)
{ lifespan *span = c->value;
next = c->next;
span->died = GEN_PREHIST;
rdf_free(q->db, c, sizeof(*c));
}
q->transaction_data.lifespans.head = NULL;
q->transaction_data.lifespans.tail = NULL;
}
void
close_transaction(query *q)
{ assert(q->type == Q_TRANSACTION);
free_triple_buffer(q->transaction_data.added);
free_triple_buffer(q->transaction_data.deleted);
free_triple_buffer(q->transaction_data.updated);
invalidate_lifespans_transaction(q);
q->stack->transaction = q->transaction;
close_query(q);
}
static void
commit_add(query *q, gen_t gen_max, gen_t gen, triple *t)
{ t = deref_triple(q->db, t);
if ( t->lifespan.died == gen_max )
{ t->lifespan.born = gen;
add_triple_consequences(q->db, t, q);
if ( q->transaction )
buffer_triple(q->transaction->transaction_data.added, t);
else
t->lifespan.died = GEN_MAX;
}
}
static void
commit_del(query *q, gen_t gen, triple *t)
{ t = deref_triple(q->db, t);
if ( is_wr_transaction_gen(q, t->lifespan.died) )
{ t->lifespan.died = gen;
if ( q->transaction )
{ del_triple_consequences(q->db, t, q);
buffer_triple(q->transaction->transaction_data.deleted, t);
} else
{ erase_triple(q->db, t, q);
}
}
}
int
commit_transaction(query *q)
{ rdf_db *db = q->db;
triple **tp;
gen_t gen, gen_max;
simpleMutexLock(&db->queries.write.generation_lock);
simpleMutexLock(&db->queries.write.lock);
gen = queryWriteGen(q) + 1;
gen_max = transaction_max_gen(q);
/* added triples */
for(tp=q->transaction_data.added->base;
tp<q->transaction_data.added->top;
tp++)
{ commit_add(q, gen_max, gen, *tp);
}
/* deleted triples */
for(tp=q->transaction_data.deleted->base;
tp<q->transaction_data.deleted->top;
tp++)
{ commit_del(q, gen, *tp);
}
/* updated triples */
for(tp=q->transaction_data.updated->base;
tp<q->transaction_data.updated->top;
tp += 2)
{ triple *to = tp[0];
triple *tn = tp[1];
commit_del(q, gen, to);
commit_add(q, gen_max, gen, tn);
}
setWriteGen(q, gen);
simpleMutexUnlock(&db->queries.write.lock);
simpleMutexUnlock(&db->queries.write.generation_lock);
q->stack->transaction = q->transaction; /* do not nest monitor calls */
/* inside the transaction */
/* Broadcast new triples */
if ( !q->transaction )
{ if ( rdf_is_broadcasting(EV_RETRACT) )
{ for(tp=q->transaction_data.deleted->base;
tp<q->transaction_data.deleted->top;
tp++)
{ triple *t = *tp;
if ( t->lifespan.died == gen )
{ if ( !rdf_broadcast(EV_RETRACT, t, NULL) )
return FALSE;
}
}
}
if ( rdf_is_broadcasting(EV_ASSERT|EV_ASSERT_LOAD) )
{ for(tp=q->transaction_data.added->base;
tp<q->transaction_data.added->top;
tp++)
{ triple *t = *tp;
if ( t->lifespan.born == gen )
{ broadcast_id id = t->loaded ? EV_ASSERT_LOAD : EV_ASSERT;
if ( !rdf_broadcast(id, t, NULL) )
return FALSE;
}
}
}
if ( rdf_is_broadcasting(EV_UPDATE) )
{ for(tp=q->transaction_data.updated->base;
tp<q->transaction_data.updated->top;
tp += 2)
{ triple *to = tp[0];
triple *tn = tp[1];
if ( to->lifespan.died == gen &&
tn->lifespan.born == gen )
{ if ( !rdf_broadcast(EV_UPDATE, to, tn) )
return FALSE;
}
}
}
}
close_transaction(q);
return TRUE;
}
/* TBD: What if someone else deleted this triple too? We can check
that by discovering multiple changes to the died generation.
*/
int
discard_transaction(query *q)
{ rdf_db *db = q->db;
triple **tp;
gen_t gen_max = transaction_max_gen(q);
for(tp=q->transaction_data.added->base;
tp<q->transaction_data.added->top;
tp++)
{ triple *t = *tp;
/* revert creation of new */
if ( is_wr_transaction_gen(q, t->lifespan.born) )
{ t = deref_triple(db, t);
t->lifespan.died = GEN_PREHIST;
erase_triple(db, t, q);
}
}
for(tp=q->transaction_data.deleted->base;
tp<q->transaction_data.deleted->top;
tp++)
{ triple *t = *tp;
/* revert deletion of old */
if ( is_wr_transaction_gen(q, t->lifespan.died) )
{ t = deref_triple(db, t);
t->lifespan.died = gen_max;
}
}
for(tp=q->transaction_data.updated->base;
tp<q->transaction_data.updated->top;
tp += 2)
{ triple *to = tp[0];
triple *tn = tp[1];
/* revert deletion of old */
if ( is_wr_transaction_gen(q, to->lifespan.died) )
{ to = deref_triple(db, to);
to->lifespan.died = gen_max;
}
/* revert creation of new */
if ( is_wr_transaction_gen(q, tn->lifespan.born) &&
tn->lifespan.died == gen_max )
{ tn = deref_triple(db, tn);
tn->lifespan.died = GEN_PREHIST;
erase_triple(db, tn, q);
}
}
close_transaction(q);
return TRUE;
}
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