monero/contrib/epee/include/winobj.h

// Copyright (c) 2014, The Monero Project
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
// 
// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
// 
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
// 
// 3. Neither the name of the copyright holder nor the names of its contributors may be
//    used to endorse or promote products derived from this software without specific
//    prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// 
// Parts of this file are originally copyright (c) 2006-2013, Andrey N. Sabelnikov

#ifndef __WINH_OBJ_H__
#define __WINH_OBJ_H__

#include <boost/thread/locks.hpp>

namespace epee
{
class critical_region;

class critical_section {

	boost::mutex	m_section;

public:

	critical_section( const critical_section& section ) {
		InitializeCriticalSection( &m_section );
	}

	critical_section() {
		InitializeCriticalSection( &m_section );
	}

	~critical_section() {
		DeleteCriticalSection( &m_section );
	}

	void lock() {
		EnterCriticalSection( &m_section );
	}

	void unlock() {
		LeaveCriticalSection( &m_section );
	}

	bool tryLock() {
		return TryEnterCriticalSection( &m_section )? true:false;
	}

	critical_section& operator=( const critical_section& section )
	{
		return *this;
	}


};

class critical_region {

	::critical_section		*m_locker;

	critical_region( const critical_region& ){}

public:

	critical_region(critical_section &cs ) {
		m_locker = &cs;
		cs.lock();		
	}

	~critical_region()
	{
		m_locker->unlock();
	}
};


class shared_critical_section
{
public: 
	shared_critical_section()
	{
		::InitializeSRWLock(&m_srw_lock);
	}
	~shared_critical_section()
	{}

	bool lock_shared()
	{
		AcquireSRWLockShared(&m_srw_lock);
		return true;
	}
	bool unlock_shared()
	{
		ReleaseSRWLockShared(&m_srw_lock);
		return true;
	}
	bool lock_exclusive()
	{
		::AcquireSRWLockExclusive(&m_srw_lock);
		return true;
	}
	bool unlock_exclusive()
	{
		::ReleaseSRWLockExclusive(&m_srw_lock);
		return true;
	}
private:
	SRWLOCK m_srw_lock;

};


class shared_guard
{
public:
	shared_guard(shared_critical_section& ref_sec):m_ref_sec(ref_sec)
	{
		m_ref_sec.lock_shared();
	}

	~shared_guard()
	{
		m_ref_sec.unlock_shared();
	}

private:
	shared_critical_section& m_ref_sec;
};


class exclusive_guard
{
public:
	exclusive_guard(shared_critical_section& ref_sec):m_ref_sec(ref_sec)
	{
		m_ref_sec.lock_exclusive();
	}

	~exclusive_guard()
	{
		m_ref_sec.unlock_exclusive();
	}

private:
	shared_critical_section& m_ref_sec;
};


class event
{
public:
	event()
	{
		m_hevent = ::CreateEvent(NULL, FALSE, FALSE, NULL);
	}
	~event()
	{
		::CloseHandle(m_hevent);
		
	}

	bool set()
	{
		return ::SetEvent(m_hevent) ? true:false;
	}

	bool reset()
	{
		return ::ResetEvent(m_hevent) ? true:false;
	}

	HANDLE get_handle()
	{
		return m_hevent;
	}
private: 
	HANDLE m_hevent;

};


#define  SHARED_CRITICAL_REGION_BEGIN(x) { shared_guard   critical_region_var(x)
#define  EXCLUSIVE_CRITICAL_REGION_BEGIN(x) { exclusive_guard   critical_region_var(x)



#define  CRITICAL_REGION_LOCAL(x) critical_region   critical_region_var(x)
#define  CRITICAL_REGION_BEGIN(x) { critical_region   critical_region_var(x)
#define  CRITICAL_REGION_END()	}


	inline const char* get_wait_for_result_as_text(DWORD res)
	{
		switch(res)
		{
		case WAIT_ABANDONED: return "WAIT_ABANDONED";
		case WAIT_TIMEOUT:  return "WAIT_TIMEOUT";
		case WAIT_OBJECT_0: return "WAIT_OBJECT_0";
		case WAIT_OBJECT_0+1: return "WAIT_OBJECT_1";
		case WAIT_OBJECT_0+2: return "WAIT_OBJECT_2";
		default:
			return "UNKNOWN CODE";
		}
		
	}

}// namespace epee

#endif