// SoftEther VPN Source Code
// Mayaqua Kernel
// 
// SoftEther VPN Server, Client and Bridge are free software under GPLv2.
// 
// Copyright (c) 2012-2014 Daiyuu Nobori.
// Copyright (c) 2012-2014 SoftEther VPN Project, University of Tsukuba, Japan.
// Copyright (c) 2012-2014 SoftEther Corporation.
// 
// All Rights Reserved.
// 
// http://www.softether.org/
// 
// Author: Daiyuu Nobori
// Comments: Tetsuo Sugiyama, Ph.D.
// 
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// version 2 as published by the Free Software Foundation.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License version 2
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
// 
// THE LICENSE AGREEMENT IS ATTACHED ON THE SOURCE-CODE PACKAGE
// AS "LICENSE.TXT" FILE. READ THE TEXT FILE IN ADVANCE TO USE THE SOFTWARE.
// 
// 
// THIS SOFTWARE IS DEVELOPED IN JAPAN, AND DISTRIBUTED FROM JAPAN,
// UNDER JAPANESE LAWS. YOU MUST AGREE IN ADVANCE TO USE, COPY, MODIFY,
// MERGE, PUBLISH, DISTRIBUTE, SUBLICENSE, AND/OR SELL COPIES OF THIS
// SOFTWARE, THAT ANY JURIDICAL DISPUTES WHICH ARE CONCERNED TO THIS
// SOFTWARE OR ITS CONTENTS, AGAINST US (SOFTETHER PROJECT, SOFTETHER
// CORPORATION, DAIYUU NOBORI OR OTHER SUPPLIERS), OR ANY JURIDICAL
// DISPUTES AGAINST US WHICH ARE CAUSED BY ANY KIND OF USING, COPYING,
// MODIFYING, MERGING, PUBLISHING, DISTRIBUTING, SUBLICENSING, AND/OR
// SELLING COPIES OF THIS SOFTWARE SHALL BE REGARDED AS BE CONSTRUED AND
// CONTROLLED BY JAPANESE LAWS, AND YOU MUST FURTHER CONSENT TO
// EXCLUSIVE JURISDICTION AND VENUE IN THE COURTS SITTING IN TOKYO,
// JAPAN. YOU MUST WAIVE ALL DEFENSES OF LACK OF PERSONAL JURISDICTION
// AND FORUM NON CONVENIENS. PROCESS MAY BE SERVED ON EITHER PARTY IN
// THE MANNER AUTHORIZED BY APPLICABLE LAW OR COURT RULE.
// 
// USE ONLY IN JAPAN. DO NOT USE IT IN OTHER COUNTRIES. IMPORTING THIS
// SOFTWARE INTO OTHER COUNTRIES IS AT YOUR OWN RISK. SOME COUNTRIES
// PROHIBIT ENCRYPTED COMMUNICATIONS. USING THIS SOFTWARE IN OTHER
// COUNTRIES MIGHT BE RESTRICTED.
// 
// 
// DEAR SECURITY EXPERTS
// ---------------------
// 
// If you find a bug or a security vulnerability please kindly inform us
// about the problem immediately so that we can fix the security problem
// to protect a lot of users around the world as soon as possible.
// 
// Our e-mail address for security reports is:
// softether-vpn-security [at] softether.org
// 
// Please note that the above e-mail address is not a technical support
// inquiry address. If you need technical assistance, please visit
// http://www.softether.org/ and ask your question on the users forum.
// 
// Thank you for your cooperation.


// Object.c
// Object management code

#include <GlobalConst.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <stdarg.h>
#include <time.h>
#include <errno.h>
#include <Mayaqua/Mayaqua.h>

// Thread to try to lock
void CheckDeadLockThread(THREAD *t, void *param)
{
	DEADCHECK *c = (DEADCHECK *)param;

	if (t == NULL || c == NULL)
	{
		return;
	}

	NoticeThreadInit(t);

	Lock(c->Lock);
	Unlock(c->Lock);
	c->Unlocked = true;
}

// Deadlock Detection
void CheckDeadLock(LOCK *lock, UINT timeout, char *name)
{
	DEADCHECK c;
	THREAD *t;
	char msg[MAX_PATH];

	if (lock == NULL)
	{
		return;
	}
	if (name == NULL)
	{
		name = "Unknown";
	}

	Format(msg, sizeof(msg), "error: CheckDeadLock() Failed: %s\n", name);

	Zero(&c, sizeof(c));
	c.Lock = lock;
	c.Timeout = timeout;
	c.Unlocked = false;

	t = NewThread(CheckDeadLockThread, &c);
	WaitThreadInit(t);
	if (WaitThread(t, timeout) == false)
	{
		if (c.Unlocked == false)
		{
			// Deadlock occured
			AbortExitEx(msg);
		}
		else
		{
			WaitThread(t, INFINITE);
		}
	}

	ReleaseThread(t);
}

// Create a lock object
LOCK *NewLockMain()
{
	LOCK *lock;
	UINT retry = 0;

	while (true)
	{
		if ((retry++) > OBJECT_ALLOC__MAX_RETRY)
		{
			AbortExitEx("error: OSNewLock() failed.\n\n");
		}
		lock = OSNewLock();
		if (lock != NULL)
		{
			break;
		}
		SleepThread(OBJECT_ALLOC_FAIL_SLEEP_TIME);
	}

	return lock;
}
LOCK *NewLock()
{
	LOCK *lock = NewLockMain();

	// KS
	KS_INC(KS_NEWLOCK_COUNT);
	KS_INC(KS_CURRENT_LOCK_COUNT);

	return lock;
}

// Delete the lock object
void DeleteLock(LOCK *lock)
{
	// Validate arguments
	if (lock == NULL)
	{
		return;
	}

	// KS
	KS_INC(KS_DELETELOCK_COUNT);
	KS_DEC(KS_CURRENT_LOCK_COUNT);

	OSDeleteLock(lock);
}

// Lock
bool LockInner(LOCK *lock)
{
	// Validate arguments
	if (lock == NULL)
	{
		return false;
	}

	// KS
	KS_INC(KS_LOCK_COUNT);
	KS_INC(KS_CURRENT_LOCKED_COUNT);

	return OSLock(lock);
}

// Unlock
void UnlockInner(LOCK *lock)
{
	// Validate arguments
	if (lock == NULL)
	{
		return;
	}

	// KS
	KS_INC(KS_UNLOCK_COUNT);
	KS_DEC(KS_CURRENT_LOCKED_COUNT);

	OSUnlock(lock);
}

// Creating a counter
COUNTER *NewCounter()
{
	COUNTER *c;

	// Memory allocation
	c = Malloc(sizeof(COUNTER));

	// Initialization
	c->Ready = true;
	c->c = 0;

	// Lock created
	c->lock = NewLock();

	// KS
	KS_INC(KS_NEW_COUNTER_COUNT);

	return c;
}

// Delete the counter
void DeleteCounter(COUNTER *c)
{
	// Validate arguments
	if (c == NULL)
	{
		return;
	}

	// KS
	KS_INC(KS_DELETE_COUNTER_COUNT);
	KS_SUB(KS_CURRENT_COUNT, c->c);

	DeleteLock(c->lock);
	Free(c);
}

// Get the count value
UINT Count(COUNTER *c)
{
	UINT ret;
	// Validate arguments
	if (c == NULL)
	{
		return 0;
	}
	if (c->Ready == false)
	{
		return 0;
	}

	Lock(c->lock);
	{
		if (c->Ready == false)
		{
			ret = 0;
		}
		else
		{
			ret = c->c;
		}
	}
	Unlock(c->lock);

	return ret;
}

// Increment
UINT Inc(COUNTER *c)
{
	UINT ret;
	// Validate arguments
	if (c == NULL)
	{
		return 0;
	}
	if (c->Ready == false)
	{
		return 0;
	}

	Lock(c->lock);
	{
		if (c->Ready == false)
		{
			ret = 0;
		}
		else
		{
			c->c++;
			ret = c->c;
		}
	}
	Unlock(c->lock);

	// KS
	KS_INC(KS_INC_COUNT);
	KS_INC(KS_CURRENT_COUNT);

	return ret;
}

// Decrement
UINT Dec(COUNTER *c)
{
	UINT ret;
	// Validate arguments
	if (c == NULL)
	{
		return 0;
	}
	if (c->Ready == false)
	{
		return 0;
	}

	Lock(c->lock);
	{
		if (c->Ready == false)
		{
			ret = 0;
		}
		else
		{
			if (c->c != 0)
			{
				c->c--;
				ret = c->c;
			}
			else
			{
				ret = 0;
			}
		}
	}
	Unlock(c->lock);

	// KS
	KS_INC(KS_DEC_COUNT);
	KS_DEC(KS_CURRENT_COUNT);

	return ret;
}


// Release of the reference counter
UINT Release(REF *ref)
{
	UINT c;
	// Validate arguments
	if (ref == NULL)
	{
		return 0;
	}

	// KS
	KS_INC(KS_RELEASE_COUNT);
	KS_DEC(KS_CURRENT_REFED_COUNT);

	c = Dec(ref->c);
	if (c == 0)
	{
		// KS
		KS_DEC(KS_CURRENT_REF_COUNT);
		KS_INC(KS_FREEREF_COUNT);

		DeleteCounter(ref->c);
		ref->c = 0;
		Free(ref);
	}
	return c;
}

// Increase of the reference counter
UINT AddRef(REF *ref)
{
	UINT c;
	// Validate arguments
	if (ref == NULL)
	{
		return 0;
	}

	c = Inc(ref->c);

	// KS
	KS_INC(KS_ADDREF_COUNT);
	KS_INC(KS_CURRENT_REFED_COUNT);

	return c;
}

// Create a reference counter
REF *NewRef()
{
	REF *ref;

	// Memory allocation
	ref = Malloc(sizeof(REF));

	// Create a Counter
	ref->c = NewCounter();

	// Increment only once
	Inc(ref->c);

	// KS
	KS_INC(KS_NEWREF_COUNT);
	KS_INC(KS_CURRENT_REF_COUNT);
	KS_INC(KS_ADDREF_COUNT);
	KS_INC(KS_CURRENT_REFED_COUNT);

	return ref;
}

// Creating an event object
EVENT *NewEvent()
{
	// Memory allocation
	EVENT *e = Malloc(sizeof(EVENT));

	// Reference counter
	e->ref = NewRef();

	// Event initialization
	OSInitEvent(e);

	// KS
	KS_INC(KS_NEWEVENT_COUNT);

	return e;
}

// Release of the event
void ReleaseEvent(EVENT *e)
{
	// Validate arguments
	if (e == NULL)
	{
		return;
	}

	if (Release(e->ref) == 0)
	{
		CleanupEvent(e);
	}
}

// Delete the event
void CleanupEvent(EVENT *e)
{
	// Validate arguments
	if (e == NULL)
	{
		return;
	}

	// Release event
	OSFreeEvent(e);

	// Memory release
	Free(e);

	// KS
	KS_INC(KS_FREEEVENT_COUNT);
}

// Set event
void Set(EVENT *e)
{
	// Validate arguments
	if (e == NULL)
	{
		return;
	}

	OSSetEvent(e);
}

// Wait for event
bool Wait(EVENT *e, UINT timeout)
{
	// Validate arguments
	if (e == NULL)
	{
		return false;
	}

	// KS
	KS_INC(KS_WAIT_COUNT);

	return OSWaitEvent(e, timeout);
}

// Wait for a event until the cancel flag becomes true
bool WaitEx(EVENT *e, UINT timeout, volatile bool *cancel)
{
	bool dummy_bool = false;
	UINT64 start, giveup;
	// Validate arguments
	if (cancel == NULL)
	{
		cancel = &dummy_bool;
	}

	start = Tick64();

	if (timeout == INFINITE || timeout == 0x7FFFFFFF)
	{
		giveup = 0;
	}
	else
	{
		giveup = start + (UINT64)timeout;
	}

	while (true)
	{
		UINT64 now = Tick64();
		UINT interval_to_giveup = (UINT)(giveup - now);
		if (giveup == 0)
		{
			interval_to_giveup = INFINITE;
		}
		else
		{
			if (now >= giveup)
			{
				// Time-out occurs
				return false;
			}
		}

		interval_to_giveup = MIN(interval_to_giveup, 25);

		if (*cancel)
		{
			// Cancel flag is set to true. Time-out occurs
			return false;
		}

		if (e != NULL)
		{
			if (Wait(e, interval_to_giveup))
			{
				// Event is set
				return true;
			}
		}
		else
		{
			SleepThread(interval_to_giveup);
		}
	}
}




// Developed by SoftEther VPN Project at University of Tsukuba in Japan.
// Department of Computer Science has dozens of overly-enthusiastic geeks.
// Join us: http://www.tsukuba.ac.jp/english/admission/