--- parser3/src/include/pa_os.h	2003/11/19 08:20:02	1.2
+++ parser3/src/include/pa_os.h	2007/05/24 10:32:42	1.7
@@ -1,14 +1,22 @@
 /** @file
 	Parser: commonly used functions.
 
-	Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
+	Copyright (c) 2001-2005 ArtLebedev Group (http://www.artlebedev.com)
 	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 */
 
 #ifndef PA_OS_H
 #define PA_OS_H
 
-static const char* IDENT_OS_H="$Date: 2003/11/19 08:20:02 $";
+static const char * const IDENT_OS_H="$Date: 2007/05/24 10:32:42 $";
+
+#define PA_LOCK_ATTEMPTS 20
+#define PA_LOCK_WAIT_TIMEOUT_SECS 0
+#define PA_LOCK_WAIT_TIMEOUT_USECS 500000
+
+// 'blocking' mean we will wait till other process release lock 
+// but we'll make PA_LOCK_ATTEMPTS attempts with PA_LOCK_WAIT_TIMEOUT secs delaus between attempts 
+// 'nonblocking' mean we will make only 1 attempt without waiting
 
 int pa_lock_shared_blocking(int fd);
 int pa_lock_exclusive_blocking(int fd);