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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.
*
* $Id$
*/
#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 IConsWaitable {
public:
virtual ~IConsWaitable() {}
virtual int SignalToWaitFor() const = 0;
};
// A List of objects we can wait for.
class cConsWaitableList {
private:
IConsWaitable** _list;
int _listCount;
fd_set _wait;
public:
cConsWaitableList();
~cConsWaitableList();
void Add(IConsWaitable* pObj);
void Remove(IConsWaitable* pObj);
bool Wait(int timeoutMs = 0);
bool IsSignalled(IConsWaitable* 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 call this a simple pipe.
class cConsSimplePipe {
private:
int _pipe[ 2 ];
public:
cConsSimplePipe();
virtual ~cConsSimplePipe();
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 cConsSignal
: private cConsSimplePipe,
public IConsWaitable
{
public:
cConsSignal();
virtual ~cConsSignal() {}
void Signal();
void Reset();
bool IsSignalled();
//IConsWaitable
virtual int SignalToWaitFor() const { return getReader(); }
};
#endif //__CON_IPC_H
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