PIBinaryLog recreate index performance patch

libs/main/io_devices/pibinarylog.cpp

@@ -153,6 +153,7 @@ bool PIBinaryLog::openDevice() {
 bool PIBinaryLog::closeDevice() {
 	stopThreadedRead();
 	pausemutex.unlock();
+	logmutex.unlock();
 	moveIndex(-1);
 	is_indexed = false;
 	index.clear();
@@ -654,7 +655,9 @@ bool PIBinaryLog::createIndex() {
 	llong cp = file.pos();
 	file.seekToBegin();
 	index.clear();
+	index = PIVector<BinLogIndex>();
 	index_pos.clear();
+	index_pos = PIMap<llong, int>();
 	parseLog(&file, &binfo, &index);
 	file.seek(cp);
 	is_indexed = !index.isEmpty();