Fixes a race condition when more than one thread tries to access the grid file (thanks Patrick)

DataStructures/HashTable.h

@@ -0,0 +1,47 @@
+/*
+    open source routing machine
+    Copyright (C) Dennis Luxen, others 2010
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU AFFERO General Public License as published by
+the Free Software Foundation; either version 3 of the License, or
+any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+or see http://www.gnu.org/licenses/agpl.txt.
+
+  Created on: 18.11.2010
+  Author: dennis
+*/
+
+#ifndef HASHTABLE_H_
+#define HASHTABLE_H_
+
+#include <google/sparse_hash_map>
+
+template<typename keyT, typename valueT>
+class HashTable {
+	typedef google::sparse_hash_map<keyT, valueT> MyHashTable;
+public:
+	HashTable() { }
+	HashTable(const unsigned size) {
+		table.resize(size);
+	}
+	void Add(const keyT& key, const valueT& value){
+		table[key] = value;
+	}
+	valueT Find(const keyT& key) {
+		return table.find(key)->second;
+	}
+private:
+	MyHashTable table;
+};
+
+#endif /* HASHTABLE_H_ */

DataStructures/NodeInformationHelpDesk.h

@@ -61,6 +61,10 @@ public:
 	inline bool FindRoutingStarts(const _Coordinate start, const _Coordinate target, PhantomNodes * phantomNodes) {
 	    g->FindRoutingStarts(start, target, phantomNodes);
 	}
+
+	inline void RegisterThread(const unsigned k, const unsigned v) {
+		g->threadLookup.table.Add(k, v);
+	}
 private:
 	vector<_Coordinate> * int2ExtNodeMap;
 	ReadOnlyGrid * g;

DataStructures/Util.h

@@ -37,4 +37,12 @@ inline double get_timestamp()
 double y2lat(double a) { return 180/M_PI * (2 * atan(exp(a*M_PI/180)) - M_PI/2); }
 double lat2y(double a) { return 180/M_PI * log(tan(M_PI/4+a*(M_PI/180)/2)); }
 
+inline unsigned boost_thread_id_hash(boost::thread::id const& id)
+{
+	std::stringstream ostr;
+	ostr << id;
+	std::tr1::hash<std::string> h;
+	return h(ostr.str());
+}
+
 #endif /* TIMEUTIL_H_ */