/*
 * \brief  Linux-specific platform thread implementation
 * \author Norman Feske
 * \date   2007-10-15
 */

/*
 * Copyright (C) 2007-2013 Genode Labs GmbH
 *
 * This file is part of the Genode OS framework, which is distributed
 * under the terms of the GNU General Public License version 2.
 */

/* Genode includes */
#include <util/token.h>
#include <util/misc_math.h>
#include <base/printf.h>

/* local includes */
#include "platform_thread.h"
#include "server_socket_pair.h"

using namespace Genode;


typedef Token<Scanner_policy_identifier_with_underline> Tid_token;


/*******************************
 ** Platform_thread::Registry **
 *******************************/

void Platform_thread::Registry::insert(Platform_thread *thread)
{
	Lock::Guard guard(_lock);
	_list.insert(thread);
}


void Platform_thread::Registry::remove(Platform_thread *thread)
{
	Lock::Guard guard(_lock);
	_list.remove(thread);
}


void Platform_thread::Registry::submit_exception(unsigned long pid)
{
	Lock::Guard guard(_lock);

	/* traverse list to find 'Platform_thread' with matching PID */
	for (Platform_thread *curr = _list.first(); curr; curr = curr->next()) {

		if (curr->_tid == pid) {
			Signal_context_capability sigh = curr->_pager._sigh;

			if (sigh.valid())
				Signal_transmitter(sigh).submit();

			return;
		}
	}
}


Platform_thread::Registry *Platform_thread::_registry()
{
	static Platform_thread::Registry registry;
	return &registry;
}


/*********************
 ** Platform_thread **
 *********************/

Platform_thread::Platform_thread(const char *name, unsigned, addr_t)
: _tid(-1), _pid(-1)
{
	strncpy(_name, name, min(sizeof(_name), strlen(name) + 1));

	_registry()->insert(this);
}


Platform_thread::~Platform_thread()
{
	ep_sd_registry()->disassociate(_ncs.client_sd);

	if (_ncs.client_sd)
		lx_close(_ncs.client_sd);

	if (_ncs.server_sd)
		lx_close(_ncs.server_sd);

	_registry()->remove(this);
}


void Platform_thread::cancel_blocking()
{
	PDBG("send cancel-blocking signal to %ld\n", _tid);
	lx_tgkill(_pid, _tid, LX_SIGUSR1);
}


void Platform_thread::pause()
{
	PDBG("not implemented");
}


void Platform_thread::resume()
{
	PDBG("not implemented");
}


int Platform_thread::client_sd()
{
	/* construct socket pair on first call */
	if (_ncs.client_sd == -1)
		_ncs = create_server_socket_pair(_tid);

	return _ncs.client_sd;
}


int Platform_thread::server_sd()
{
	client_sd();
	return _ncs.server_sd;
}