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/*
* ipc.h: A plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id: ipc.h,v 1.1 2004/10/24 12:57:09 chelli-guest Exp $
*/
#ifndef __CON_IPC_H
#define __CON_IPC_H
#include <stdio.h>
#include <sys/types.h>
#include <vdr/thread.h>
// Interface that can be implemented,
// if one can wait (signal) for the object.
class IWaitable {
public:
virtual ~IWaitable() {}
virtual int SignalToWaitFor() const = 0;
};
// A List of objects we can wait for.
class cWaitableList {
private:
IWaitable** _list;
int _listCount;
fd_set _wait;
public:
cWaitableList();
~cWaitableList();
void Add( IWaitable* pObj );
void Remove( IWaitable* pObj );
bool Wait( int timeoutMs = 0 );
bool IsSignalled( IWaitable* pObj ) {
if ( pObj && pObj->SignalToWaitFor() >= 0 )
return FD_ISSET( pObj->SignalToWaitFor(), &_wait );
return false;
}
bool IsSignalled( int fd ) {
return FD_ISSET( fd, &_wait );
}
};
// This is the real pipe, but that name is taken from the vdr source.
// So I name this a simple pipe.
class cSimplePipe {
private:
int _pipe[ 2 ];
public:
cSimplePipe();
virtual ~cSimplePipe();
bool Open();
void Close();
bool IsOpen() { return _pipe[ 0 ] >= 0 && _pipe[ 1 ] >= 0; }
int getReader() const { return _pipe[ 0 ]; }
int getWriter() const { return _pipe[ 1 ]; }
};
// Can be used to signal an other thread.
// This could also be realized by using a semaphore.
// But by using a pipe one can wait for a signal with select.
class cSignal
: private cSimplePipe,
public IWaitable
{
public:
cSignal();
virtual ~cSignal() {}
void Signal();
void Reset();
bool IsSignalled();
//IWaitable
virtual int SignalToWaitFor() const { return getReader(); }
};
#endif //__CON_IPC_H
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