Made DELETENULL() thread safe

CONTRIBUTORS

@@ -1108,6 +1108,7 @@ Rolf Ahrenberg <rahrenbe@cc.hut.fi>
  for adding handling of "ANSI/SCTE 57" descriptors
  for some input on how to use BER and UNC values to generate a "quality" value
  for fixing some crashes in subtitle display
+ for reporting that DELETENULL() was not thread safe
 
 Ralf Klueber <ralf.klueber@vodafone.com>
  for reporting a bug in cutting a recording if there is only a single editing mark

HISTORY

@@ -6682,3 +6682,4 @@ Video Disk Recorder Revision History
 - The length (as number of frames) of a recording's index file can now be determined
   by a call to cIndexFile::GetLength() (suggested by Christoph Haubrich).
 - Fixed some crashes in subtitle display (thanks to Rolf Ahrenberg).
+- Made DELETENULL() thread safe (reported by Rolf Ahrenberg).

tools.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: tools.h 2.8 2011/08/12 14:04:00 kls Exp $
+ * $Id: tools.h 2.9 2011/08/13 13:36:37 kls Exp $
  */
 
 #ifndef __TOOLS_H
@@ -45,7 +45,7 @@ extern int SysLogLevel;
 
 #define MALLOC(type, size)  (type *)malloc(sizeof(type) * (size))
 
-#define DELETENULL(p) (delete (p), p = NULL)
+template<class T> inline void DELETENULL(T *&p) { T *q = p; p = NULL; delete q; } 
 
 #define CHECK(s) { if ((s) < 0) LOG_ERROR; } // used for 'ioctl()' calls
 #define FATALERRNO (errno && errno != EAGAIN && errno != EINTR)