* Sebastian Hammer, Adam Dickmeiss
*
* $Log: recindex.c,v $
- * Revision 1.11 1995-12-06 13:58:26 adam
+ * Revision 1.14 1996-02-01 20:48:15 adam
+ * The total size of records are always checked in rec_cache_insert to
+ * reduce memory usage.
+ *
+ * Revision 1.13 1995/12/11 09:12:49 adam
+ * The rec_get function returns NULL if record doesn't exist - will
+ * happen in the server if the result set records have been deleted since
+ * the creation of the set (i.e. the search).
+ * The server saves a result temporarily if it is 'volatile', i.e. the
+ * set is register dependent.
+ *
+ * Revision 1.12 1995/12/07 17:38:47 adam
+ * Work locking mechanisms for concurrent updates/commit.
+ *
+ * Revision 1.11 1995/12/06 13:58:26 adam
* Improved flushing of records - all flushes except the last one
* don't write the last accessed. Also flush takes place if record
* info occupy more than about 256k.
if (read_indx (p, sysno, &entry, sizeof(entry), 1) != 1)
return ;
- p->head.total_bytes -= entry.u.used.size;
- freeblock = entry.u.used.next;
+ p->head.total_bytes -= entry.size;
+ freeblock = entry.next;
assert (freeblock > 0);
dst_type = freeblock & 7;
assert (dst_type < REC_BLOCK_TYPES);
rec_release_blocks (p, rec->sysno);
- entry.u.free.next = p->head.index_free;
+ entry.next = p->head.index_free;
+ entry.size = 0;
p->head.index_free = rec->sysno;
write_indx (p, rec->sysno, &entry, sizeof(entry));
}
block_free = p->head.block_last[dst_type]++;
if (block_prev == -1)
{
- entry.u.used.next = block_free*8 + dst_type;
- entry.u.used.size = size;
+ entry.next = block_free*8 + dst_type;
+ entry.size = size;
p->head.total_bytes += size;
write_indx (p, rec->sysno, &entry, sizeof(entry));
}
if (p->cache_cur == p->cache_max)
rec_cache_flush (p, 1);
- else if (p->cache_cur > 2)
+ else if (p->cache_cur > 0)
{
int i, j;
int used = 0;
if ((recp = rec_cache_lookup (p, sysno, recordFlagNop)))
return rec_cp (*recp);
- read_indx (p, sysno, &entry, sizeof(entry), 0);
+ if (!read_indx (p, sysno, &entry, sizeof(entry), 1))
+ return NULL; /* record is not there! */
+
+ if (!entry.size)
+ return NULL; /* record is deleted */
- dst_type = entry.u.used.next & 7;
+ dst_type = entry.next & 7;
assert (dst_type < REC_BLOCK_TYPES);
- freeblock = entry.u.used.next / 8;
+ freeblock = entry.next / 8;
assert (freeblock > 0);
rec = xmalloc (sizeof(*rec));
- rec_tmp_expand (p, entry.u.used.size, dst_type);
+ rec_tmp_expand (p, entry.size, dst_type);
cptr = p->tmp_buf;
bf_read (p->data_BFile[dst_type], freeblock, 0, 0, cptr);
read_indx (p, p->head.index_free, &entry, sizeof(entry), 0);
sysno = p->head.index_free;
- p->head.index_free = entry.u.free.next;
+ p->head.index_free = entry.next;
}
(p->head.no_records)++;
rec->sysno = sysno;
{
Record *recp;
+ (p->head.no_records)--;
if ((recp = rec_cache_lookup (p, (*recpp)->sysno, recordFlagDelete)))
{
rec_rm (recp);