The cThread constructor now has an additional boolean parameter that can be set to true to have this thread run at a lower priority

HISTORY

@@ -7272,7 +7272,7 @@ Video Disk Recorder Revision History
   ".keep" to prevent a directory from being deleted when it is empty. Currently the
   only file name that is ignored is ".sort".
 
-2012-10-03: Version 1.7.32
+2012-10-04: Version 1.7.32
 
 - Pressing the Play key during normal live viewing mode now opens the Recordings menu
   if there is no "last viewed" recording (thanks to Alexander Wenzel).
@@ -7280,3 +7280,8 @@ Video Disk Recorder Revision History
 - cIoThrottle::Engaged() is now also checked in cRemoveDeletedRecordingsThread::Action(),
   to suspend removing deleted recordings in case this is necessary to make room for
   new, ongoing recordings (suggested by Udo Richter).
+- The cThread constructor now has an additional boolean parameter that can be set to
+  true to have this thread run at a lower priority. Plugin authors that use low
+  priority threads may want to use this instead of the calls to SetPriority(19) and
+  SetIOPriority(7). The priority of a thread ("low" or "high") is now logged when the
+  thread starts.

cutter.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: cutter.c 2.14 2012/09/20 09:12:47 kls Exp $
+ * $Id: cutter.c 2.15 2012/10/04 12:19:37 kls Exp $
  */
 
 #include "cutter.h"
@@ -33,7 +33,7 @@ public:
   };
 
 cCuttingThread::cCuttingThread(const char *FromFileName, const char *ToFileName)
-:cThread("video cutting")
+:cThread("video cutting", true)
 {
   error = NULL;
   fromFile = toFile = NULL;
@@ -69,8 +69,6 @@ void cCuttingThread::Action(void)
 {
   cMark *Mark = fromMarks.First();
   if (Mark) {
-     SetPriority(19);
-     SetIOPriority(7);
      fromFile = fromFileName->Open();
      toFile = toFileName->Open();
      if (!fromFile || !toFile)

epg.c

@@ -7,7 +7,7 @@
  * Original version (as used in VDR before 1.3.0) written by
  * Robert Schneider <Robert.Schneider@web.de> and Rolf Hakenes <hakenes@hippomi.de>.
  *
- * $Id: epg.c 2.21 2012/09/29 14:29:49 kls Exp $
+ * $Id: epg.c 2.22 2012/10/04 12:21:24 kls Exp $
  */
 
 #include "epg.h"
@@ -1148,14 +1148,12 @@ public:
   };
 
 cEpgDataWriter::cEpgDataWriter(void)
-:cThread("epg data writer")
+:cThread("epg data writer", true)
 {
 }
 
 void cEpgDataWriter::Action(void)
 {
-  SetPriority(19);
-  SetIOPriority(7);
   Perform();
 }
 

recording.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: recording.c 2.65 2012/10/03 12:52:13 kls Exp $
+ * $Id: recording.c 2.66 2012/10/04 12:21:38 kls Exp $
  */
 
 #include "recording.h"
@@ -83,14 +83,12 @@ public:
   };
 
 cRemoveDeletedRecordingsThread::cRemoveDeletedRecordingsThread(void)
-:cThread("remove deleted recordings")
+:cThread("remove deleted recordings", true)
 {
 }
 
 void cRemoveDeletedRecordingsThread::Action(void)
 {
-  SetPriority(19);
-  SetIOPriority(7);
   // Make sure only one instance of VDR does this:
   cLockFile LockFile(VideoDirectory);
   if (LockFile.Lock()) {

sections.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: sections.c 2.1 2012/08/26 12:53:39 kls Exp $
+ * $Id: sections.c 2.2 2012/10/04 12:21:59 kls Exp $
  */
 
 #include "sections.h"
@@ -40,7 +40,7 @@ public:
 // --- cSectionHandler -------------------------------------------------------
 
 cSectionHandler::cSectionHandler(cDevice *Device)
-:cThread("section handler")
+:cThread("section handler", true)
 {
   shp = new cSectionHandlerPrivate;
   device = Device;
@@ -164,7 +164,6 @@ void cSectionHandler::SetStatus(bool On)
 
 void cSectionHandler::Action(void)
 {
-  SetPriority(19);
   while (Running()) {
 
         Lock();

thread.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: thread.c 2.5 2012/09/20 09:05:50 kls Exp $
+ * $Id: thread.c 2.6 2012/10/04 12:20:43 kls Exp $
  */
 
 #include "thread.h"
@@ -204,7 +204,7 @@ void cMutex::Unlock(void)
 
 tThreadId cThread::mainThreadId = 0;
 
-cThread::cThread(const char *Description)
+cThread::cThread(const char *Description, bool LowPriority)
 {
   active = running = false;
   childTid = 0;
@@ -212,6 +212,7 @@ cThread::cThread(const char *Description)
   description = NULL;
   if (Description)
      SetDescription("%s", Description);
+  lowPriority = LowPriority;
 }
 
 cThread::~cThread()
@@ -248,12 +249,16 @@ void *cThread::StartThread(cThread *Thread)
 {
   Thread->childThreadId = ThreadId();
   if (Thread->description) {
-     dsyslog("%s thread started (pid=%d, tid=%d)", Thread->description, getpid(), Thread->childThreadId);
+     dsyslog("%s thread started (pid=%d, tid=%d, prio=%s)", Thread->description, getpid(), Thread->childThreadId, Thread->lowPriority ? "low" : "high");
 #ifdef PR_SET_NAME
      if (prctl(PR_SET_NAME, Thread->description, 0, 0, 0) < 0)
         esyslog("%s thread naming failed (pid=%d, tid=%d)", Thread->description, getpid(), Thread->childThreadId);
 #endif
      }
+  if (Thread->lowPriority) {
+     Thread->SetPriority(19);
+     Thread->SetIOPriority(7);
+     }
   Thread->Action();
   if (Thread->description)
      dsyslog("%s thread ended (pid=%d, tid=%d)", Thread->description, getpid(), Thread->childThreadId);

thread.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: thread.h 2.2 2012/09/20 08:46:27 kls Exp $
+ * $Id: thread.h 2.3 2012/10/04 12:15:39 kls Exp $
  */
 
 #ifndef __THREAD_H
@@ -83,6 +83,7 @@ private:
   tThreadId childThreadId;
   cMutex mutex;
   char *description;
+  bool lowPriority;
   static tThreadId mainThreadId;
   static void *StartThread(cThread *Thread);
 protected:
@@ -106,11 +107,13 @@ protected:
        ///< If WaitSeconds is -1, only 'running' is set to false and Cancel()
        ///< returns immediately, without killing the thread.
 public:
-  cThread(const char *Description = NULL);
+  cThread(const char *Description = NULL, bool LowPriority = false);
        ///< Creates a new thread.
        ///< If Description is present, a log file entry will be made when
        ///< the thread starts and stops. The Start() function must be called
        ///< to actually start the thread.
+       ///< LowPriority can be set to true to make this thread run at a lower
+       ///< priority.
   virtual ~cThread();
   void SetDescription(const char *Description, ...) __attribute__ ((format (printf, 2, 3)));
   bool Start(void);