/*
 *	The Unix Channel
 *
 *	by Michel Beaudouin-Lafon and Stephane Chatty
 *
 *	Copyright 1990-1993
 *	Laboratoire de Recherche en Informatique (LRI)
 *	Centre d'Etudes de la Navigation Aerienne
 *
 *	Tk-based multiplexers
 *
 *	$Id$
 *	$CurLog$
 *	Made consistent with Tcl7.0 and Tk3.3
 */

#include "TkMultiplexer.h"

/* these files are included by tk.h, I include them here to avoid
    them being enclosed in extern "C" */
#include <X11/Xlib.h>
#include <stddef.h>
#include <stdio.h>
extern "C" {
#include "tk.h"
}

#include <memory.h>

static void
ioHandler (ClientData client_data, int mask)
{
	IvlChannel* ch = (IvlChannel*) client_data;
	if (mask & TK_WRITABLE)
		ch->HandleWrite ();
	if (mask & TK_READABLE)
		ch->HandleRead ();
}

IvlTkMultiplexer :: IvlTkMultiplexer ()
: IvlBaseMultiplexer ()
{
	memset (Active, 0, NFILE * sizeof (bool));
}

IvlTkMultiplexer :: ~IvlTkMultiplexer ()
{
}

void
IvlTkMultiplexer :: SetMasks (int fd, IOMODE mode)
{
	IvlChannel* ch = Channels [fd];
	if (!ch)
		return;

	/* remove if already there */
	if (Active [fd]) {
		Tk_DeleteFileHandler (fd);
		ReadCount--;
	}

	/* add channel */
	int mask = 0;

	if (mode & IORead)
		mask |= TK_READABLE;

	if (mode & IOWrite)
		mask |= TK_WRITABLE;

	if (mode & IOSelect)
		Error (ErrWarn, "AddChannel", "select condition ignored");

	if (mask) {
		Tk_CreateFileHandler (fd, mask, ioHandler, (ClientData) ch);
		ReadCount++;
		Active [fd] = true;
	}
}

void
IvlTkMultiplexer :: FireTimers (ClientData mpx)
{
	IvlCoreTimer::Fire (((IvlTkMultiplexer*) mpx)->GetTimerSet ());
}

void
IvlTkMultiplexer :: SetTimeOut (Millisecond delay)
{
	TimeOut = Tk_CreateTimerHandler (int (delay), &IvlTkMultiplexer::FireTimers, (ClientData) this);
}

void
IvlTkMultiplexer :: SuppressTimeOut ()
{
	Tk_DeleteTimerHandler (TimeOut);
	TimeOut = 0;
}

void
IvlTkMultiplexer :: FireSignals (ClientData mpx)
{
	((IvlTkMultiplexer*) mpx)->HandleDeferredSignals ();
}

void
IvlTkMultiplexer :: AddSignalHook ()
{
	Tk_DoWhenIdle (&IvlTkMultiplexer::FireSignals, (ClientData) this);
}
		
MPX_RES
IvlTkMultiplexer :: Loop ()
{
	Looping = true;

	Tk_MainLoop ();

	if (Looping) {
		Looping = false;
		return isMpxEmpty;
	}
	return isMpxTerminated;
}