fix bug when we nuke a collnum

from a tree right in the middle of when
saving rdb trees in process.cpp.

Collectiondb.cpp

@@ -591,6 +591,9 @@ bool Collectiondb::deleteRec ( char *coll , bool deleteTurkdb ) {
 	sc->m_lastDownloadCache.clear(collnum);
 	*/
 
+	// CAUTION: tree might be in the middle of saving
+	// we deal with this in Process.cpp now
+
 	// remove from spider cache, tell it to sync up with collectiondb
 	//g_spiderCache.reset1();
 	// . TODO: remove from g_sync
@@ -796,6 +799,9 @@ bool Collectiondb::resetColl ( char *coll , bool resetTurkdb ) {
 	// right now we #define collnum_t short
 	if ( m_numRecs > 0x7fff ) { char *xx=NULL;*xx=0; }
 
+	// CAUTION: tree might be in the middle of saving
+	// we deal with this in Process.cpp now
+
 	// . unlink all the *.dat and *.map files for this coll in its subdir
 	// . remove all recs from this collnum from m_tree/m_buckets
 	// . updates RdbBase::m_collnum

Process.cpp

@@ -1497,7 +1497,11 @@ bool Process::saveRdbTrees ( bool useThread ) {
 	// check if any need to finish saving
 	for ( long i = 0 ; i < m_numRdbs ; i++ ) {
 		Rdb *rdb = m_rdbs[i];
-		if ( rdb->needsSave ( ) ) return false;
+		//if ( rdb->needsSave ( ) ) return false;
+		// we disable the tree while saving so we can't really add recs
+		// to one rdb tree while saving, but for crawlbot
+		// we might have added or deleted collections.
+		if ( rdb->isSavingTree ( ) ) return false;
 	}
 
 	// . check spider cache files (doleiptable waitingtree etc.)

Rdb.cpp

@@ -879,6 +879,11 @@ void Rdb::doneSaving ( ) {
 	//if ( m_isClosing ) close ( );
 }
 
+bool Rdb::isSavingTree ( ) {
+	if ( m_useTree ) return m_tree.m_isSaving;
+	return m_buckets.m_isSaving;
+}
+
 bool Rdb::saveTree ( bool useThread ) {
 	char *dbn = m_dbname;
 	if ( ! dbn ) dbn = "unknown";

Rdb.h

@@ -271,6 +271,8 @@ class Rdb {
 	// . you'll lose your data in this class if you call this
 	void reset();
 
+	bool isSavingTree ( ) ;
+
 	bool saveTree  ( bool useThread ) ;
 	bool saveMaps  ( bool useThread ) ;
 	//bool saveCache ( bool useThread ) ;