From 1c1fdc5a3f1096c7b2649a6817102685574671a5 Mon Sep 17 00:00:00 2001
From: Klaus Schmidinger <vdr@tvdr.de>
Date: Mon, 12 May 2003 17:46:34 +0200
Subject: [PATCH] Re-implemented the WaitForPut/WaitForGet stuff in
 cRingBuffer, since some plugins actually need this

---
 HISTORY      |  5 ++++-
 ringbuffer.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 ringbuffer.h | 11 ++++++++++-
 3 files changed, 64 insertions(+), 3 deletions(-)

diff --git a/HISTORY b/HISTORY
index 550be80a..34d8901f 100644
--- a/HISTORY
+++ b/HISTORY
@@ -2143,7 +2143,10 @@ Video Disk Recorder Revision History
 - Changed C++ style comments in libdtv into C style to avoid warnings in gcc 3.x
   (thanks to Andreas Schultz).
 
-2003-05-11: Version 1.1.32
+2003-05-12: Version 1.1.32
 
 - Removed a faulty parameter initialization in menu.c (thanks to Lauri Tischler for
   reporting this one).
+- Re-implemented the WaitForPut/WaitForGet stuff in cRingBuffer, since some plugins
+  actually need this. By default the buffer does not wait; if a plugin needs the
+  waiting functionality it can call the new SetTimeouts() function.
diff --git a/ringbuffer.c b/ringbuffer.c
index 770b7c34..2cf9d75d 100644
--- a/ringbuffer.c
+++ b/ringbuffer.c
@@ -7,7 +7,7 @@
  * Parts of this file were inspired by the 'ringbuffy.c' from the
  * LinuxDVB driver (see linuxtv.org).
  *
- * $Id: ringbuffer.c 1.16 2003/05/11 09:47:56 kls Exp $
+ * $Id: ringbuffer.c 1.17 2003/05/12 17:38:11 kls Exp $
  */
 
 #include "ringbuffer.h"
@@ -23,6 +23,7 @@ cRingBuffer::cRingBuffer(int Size, bool Statistics)
   statistics = Statistics;
   maxFill = 0;
   lastPercent = 0;
+  putTimeout = getTimeout = 0;
 }
 
 cRingBuffer::~cRingBuffer()
@@ -31,6 +32,42 @@ cRingBuffer::~cRingBuffer()
      dsyslog("buffer stats: %d (%d%%) used", maxFill, maxFill * 100 / (size - 1));
 }
 
+void cRingBuffer::WaitForPut(void)
+{
+  if (putTimeout) {
+     putMutex.Lock();
+     readyForPut.TimedWait(putMutex, putTimeout);
+     putMutex.Unlock();
+     }
+}
+
+void cRingBuffer::WaitForGet(void)
+{
+  if (getTimeout) {
+     getMutex.Lock();
+     readyForGet.TimedWait(getMutex, getTimeout);
+     getMutex.Unlock();
+     }
+}
+
+void cRingBuffer::EnablePut(void)
+{
+  if (putTimeout)
+     readyForPut.Broadcast();
+}
+
+void cRingBuffer::EnableGet(void)
+{
+  if (getTimeout)
+     readyForGet.Broadcast();
+}
+
+void cRingBuffer::SetTimeouts(int PutTimeout, int GetTimeout)
+{
+  putTimeout = PutTimeout;
+  getTimeout = GetTimeout;
+}
+
 // --- cRingBufferLinear -----------------------------------------------------
 
 cRingBufferLinear::cRingBufferLinear(int Size, int Margin, bool Statistics)
@@ -68,6 +105,8 @@ void cRingBufferLinear::Clear(void)
   head = tail = margin;
   lastGet = -1;
   Unlock();
+  EnablePut();
+  EnableGet();
 }
 
 int cRingBufferLinear::Put(const uchar *Data, int Count)
@@ -109,6 +148,9 @@ int cRingBufferLinear::Put(const uchar *Data, int Count)
      else
         Count = 0;
      Unlock();
+     EnableGet();
+     if (Count == 0)
+        WaitForPut();
      }
   return Count;
 }
@@ -134,6 +176,8 @@ uchar *cRingBufferLinear::Get(int &Count)
      Count = lastGet = cont;
      }
   Unlock();
+  if (!p)
+     WaitForGet();
   return p;
 }
 
@@ -146,6 +190,7 @@ void cRingBufferLinear::Del(int Count)
      if (tail >= Size())
         tail = margin;
      Unlock();
+     EnablePut();
      }
   else
      esyslog("ERROR: invalid Count in cRingBufferLinear::Del: %d", Count);
@@ -196,6 +241,8 @@ void cRingBufferFrame::Clear(void)
   while ((p = Get()) != NULL)
         Drop(p);
   Unlock();
+  EnablePut();
+  EnableGet();
 }
 
 bool cRingBufferFrame::Put(cFrame *Frame)
@@ -212,6 +259,7 @@ bool cRingBufferFrame::Put(cFrame *Frame)
         }
      currentFill += Frame->Count();
      Unlock();
+     EnableGet();
      return true;
      }
   return false;
@@ -249,6 +297,7 @@ void cRingBufferFrame::Drop(cFrame *Frame)
         esyslog("ERROR: attempt to drop wrong frame from ring buffer!");
      }
   Unlock();
+  EnablePut();
 }
 
 int cRingBufferFrame::Available(void)
diff --git a/ringbuffer.h b/ringbuffer.h
index 6b256627..15063454 100644
--- a/ringbuffer.h
+++ b/ringbuffer.h
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: ringbuffer.h 1.11 2003/05/11 09:48:23 kls Exp $
+ * $Id: ringbuffer.h 1.12 2003/05/12 17:35:10 kls Exp $
  */
 
 #ifndef __RINGBUFFER_H
@@ -16,11 +16,19 @@
 class cRingBuffer {
 private:
   cMutex mutex;
+  cCondVar readyForPut, readyForGet;
+  cMutex putMutex, getMutex;
+  int putTimeout;
+  int getTimeout;
   int size;
 protected:
   int maxFill;//XXX
   int lastPercent;
   bool statistics;//XXX
+  void WaitForPut(void);
+  void WaitForGet(void);
+  void EnablePut(void);
+  void EnableGet(void);
   virtual void Clear(void) = 0;
   virtual int Available(void) = 0;
   int Free(void) { return size - Available() - 1; }
@@ -30,6 +38,7 @@ protected:
 public:
   cRingBuffer(int Size, bool Statistics = false);
   virtual ~cRingBuffer();
+  void SetTimeouts(int PutTimeout, int GetTimeout);
   };
 
 class cRingBufferLinear : public cRingBuffer {