winobj.h

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// Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of the Andrey N. Sabelnikov 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 OWNER  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.
// 
 
 
#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