1 files changed, 78 insertions, 0 deletions
diff --git a/mpeglib/lib/decoder/commandPipe.h b/mpeglib/lib/decoder/commandPipe.h
new file mode 100644
index 00000000..4ecf84eb
--- /dev/null
+++ b/mpeglib/lib/decoder/commandPipe.h
@@ -0,0 +1,78 @@
+/*
+  thread safe fifo queue for commands
+  Copyright (C) 2000  Martin Vogt
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Library General Public License as published by
+  the Free Software Foundation.
+
+  For more information look at the file COPYRIGHT in this package
+
+ */
+
+
+#ifndef __COMMAND_PIPE_H
+#define __COMMAND_PIPE_H
+
+
+
+#include "command.h"
+
+/**
+   This queue deals with the ugly deadlock problem.
+   We insert all commands in a queue and the thread
+   polls this queue for next commands.
+*/
+
+class CommandPipe {
+
+  Command** commandArray;
+  int entries;
+  int readPos;
+  int writePos;
+
+  abs_thread_mutex_t pipeMut; 
+  abs_thread_cond_t spaceCond;
+  abs_thread_cond_t emptyCond;
+  abs_thread_cond_t dataCond;
+
+ public:
+  CommandPipe();
+  ~CommandPipe();
+  
+  // writer thread:
+  void sendCommand(Command& cmd);
+  void sendCommandNoWait(Command& cmd);
+  
+  void waitForEmptyQueue();
+
+  // reader thread
+  int hasCommand(Command* dest);
+  void waitForCommand();
+  
+
+
+
+ private:
+  void sendCommand(Command& cmd,int lWait);
+
+  void lockCommandPipe();
+  void unlockCommandPipe();
+ 
+
+  // writer thread wait here
+  void waitForSpace();
+  void waitForEmpty();
+  void waitForData();
+  
+  // reader thread signals this
+  void signalSpace();
+  void signalEmpty();
+  void signalData();
+
+
+  
+
+};
+
+#endif