1 files changed, 77 insertions, 0 deletions
diff --git a/indexlib/lockfile.cpp b/indexlib/lockfile.cpp
new file mode 100644
index 000000000..d0225cda0
--- /dev/null
+++ b/indexlib/lockfile.cpp
@@ -0,0 +1,77 @@
+/* This file is part of indexlib.
+ * Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
+ *
+ * Indexlib is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation and available as file
+ * GPL_V2 which is distributed along with indexlib.
+ * 
+ * Indexlib 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 General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA
+ * 
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of this program with any edition of
+ * the Qt library by Trolltech AS, Norway (or with modified versions
+ * of Qt that use the same license as Qt), and distribute linked
+ * combinations including the two.  You must obey the GNU General
+ * Public License in all respects for all of the code used other than
+ * Qt.  If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so.  If
+ * you do not wish to do so, delete this exception statement from
+ * your version.
+ */
+
+#include "lockfile.h"
+#include "format.h"
+#include "logfile.h"
+#include <iostream>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+using indexlib::detail::lockfile;
+
+lockfile::lockfile( std::string filename ):
+	filename_( filename ),
+	locked_( false ) {
+	}
+
+lockfile::~lockfile() {
+       if ( locked() ) unlock();
+}
+
+bool lockfile::locked() const {
+	return locked_;
+}
+
+bool lockfile::trylock() {
+	int fd = ::open( filename_.c_str(), O_RDWR | O_EXCL | O_CREAT, 0600 );
+	locked_ = false;
+	if ( fd >= 0 ) {
+		locked_ = true;
+		close( fd );
+	}
+	logfile() << format( "trylock(%s) returning %s (fd:%s) (error:%s)\n" ) % filename_ % locked_ %fd % strerror( errno );
+	return locked_;
+}
+
+void lockfile::unlock() {
+	if ( locked() ) {
+		unlink( filename_.c_str() );
+		locked_ = false;
+	}
+}
+
+void lockfile::force_unlock() {
+	unlink( filename_.c_str() );
+	locked_ = false;
+}
+