Fixed flushing old data from the section handler

CONTRIBUTORS

@@ -3659,6 +3659,7 @@ Helmut Binder <cco@aon.at>
  for avoiding a lengthy lock on the Channels list when starting a recording
  for preventing switching devices for pattern timers
  for pointing out that cChannel::Transponder(void) is called very often
+ for fixing flushing old data from the section handler
 
 Ulrich Eckhardt <uli@uli-eckhardt.de>
  for reporting a problem with shutdown after user inactivity in case a plugin is

HISTORY

@@ -9716,3 +9716,4 @@ Video Disk Recorder Revision History
   std::min(), std::max() and std::swap() if available (thanks to Winfried Köhler).
 - No longer permanently looping through PMT PIDs, which caused problems with some
   SatIP receivers (reported by André Weidemann; with help from Helmut Binder).
+- Fixed flushing old data from the section handler (thanks to Helmut Binder).

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 4.2 2020/11/24 21:19:49 kls Exp $
+ * $Id: sections.c 5.1 2021/06/08 15:10:51 kls Exp $
  */
 
 #include "sections.h"
@@ -48,6 +48,8 @@ cSectionHandler::cSectionHandler(cDevice *Device)
   statusCount = 0;
   on = false;
   waitForLock = false;
+  flush = false;
+  startFilters = false;
   Start();
 }
 
@@ -146,13 +148,15 @@ void cSectionHandler::SetStatus(bool On)
 {
   Lock();
   if (on != On) {
-     if (!On || device->HasLock()) {
+     if (!On || (device->HasLock() && startFilters)) {
         statusCount++;
         for (cFilter *fi = filters.First(); fi; fi = filters.Next(fi)) {
             fi->SetStatus(false);
             if (On)
                fi->SetStatus(true);
             }
+        if (flush = On)
+           flushTimer.Set();
         on = On;
         waitForLock = false;
         }
@@ -162,13 +166,18 @@ void cSectionHandler::SetStatus(bool On)
   Unlock();
 }
 
+#define FLUSH_TIME 100 // ms
+
 void cSectionHandler::Action(void)
 {
   while (Running()) {
 
         Lock();
-        if (waitForLock)
+        if (waitForLock) {
+           startFilters = true;
            SetStatus(true);
+           startFilters = false;
+           }
         int NumFilters = filterHandles.Count();
         pollfd pfd[NumFilters];
         for (cFilterHandle *fh = filterHandles.First(); fh; fh = filterHandles.Next(fh)) {
@@ -180,10 +189,7 @@ void cSectionHandler::Action(void)
         int oldStatusCount = statusCount;
         Unlock();
 
-        if (poll(pfd, NumFilters, 1000) > 0) {
-           bool DeviceHasLock = device->HasLock();
-           if (!DeviceHasLock)
-              cCondWait::SleepMs(100);
+        if (poll(pfd, NumFilters, waitForLock ? 100 : 1000) > 0) {
            for (int i = 0; i < NumFilters; i++) {
                if (pfd[i].revents & POLLIN) {
                   cFilterHandle *fh = NULL;
@@ -198,7 +204,7 @@ void cSectionHandler::Action(void)
                      // Read section data:
                      unsigned char buf[4096]; // max. allowed size for any EIT section
                      int r = device->ReadFilter(fh->handle, buf, sizeof(buf));
-                     if (!DeviceHasLock)
+                     if (flush)
                         continue; // we do the read anyway, to flush any data that might have come from a different transponder
                      if (r > 3) { // minimum number of bytes necessary to get section length
                         int len = (((buf[1] & 0x0F) << 8) | (buf[2] & 0xFF)) + 3;
@@ -217,6 +223,8 @@ void cSectionHandler::Action(void)
                      }
                   }
                }
+           if (flush)
+              flush = flushTimer.Elapsed() <= FLUSH_TIME;
            }
         }
 }

sections.h

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: sections.h 4.1 2020/11/24 21:19:49 kls Exp $
+ * $Id: sections.h 5.1 2021/06/08 15:10:51 kls Exp $
  */
 
 #ifndef __SECTIONS_H
@@ -27,6 +27,9 @@ private:
   cDevice *device;
   int statusCount;
   bool on, waitForLock;
+  bool flush;
+  bool startFilters;
+  cTimeMs flushTimer;
   cList<cFilter> filters;
   cList<cFilterHandle> filterHandles;
   void Add(const cFilterData *FilterData);