lwm_win32_cs.hpp

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#ifndef BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED
#define BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED
 
// MS compatible compilers support #pragma once
 
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
 
//
//  boost/detail/lwm_win32_cs.hpp
//
//  Copyright (c) 2002, 2003 Peter Dimov
//  Copyright (c) Microsoft Corporation 2014
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
 
#include <boost/predef.h>
 
#ifdef BOOST_USE_WINDOWS_H
#  include <windows.h>
#endif
 
namespace boost
{
 
namespace detail
{
 
#ifndef BOOST_USE_WINDOWS_H
 
struct critical_section
{
    struct critical_section_debug * DebugInfo;
    long LockCount;
    long RecursionCount;
    void * OwningThread;
    void * LockSemaphore;
#if defined(_WIN64)
    unsigned __int64 SpinCount;
#else
    unsigned long SpinCount;
#endif
};
 
#if BOOST_PLAT_WINDOWS_RUNTIME
extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSectionEx(critical_section *, unsigned long, unsigned long);
#else
extern "C" __declspec(dllimport) void __stdcall InitializeCriticalSection(critical_section *);
#endif
extern "C" __declspec(dllimport) void __stdcall EnterCriticalSection(critical_section *);
extern "C" __declspec(dllimport) void __stdcall LeaveCriticalSection(critical_section *);
extern "C" __declspec(dllimport) void __stdcall DeleteCriticalSection(critical_section *);
 
#else
 
typedef ::CRITICAL_SECTION critical_section;
 
#endif // #ifndef BOOST_USE_WINDOWS_H
 
class lightweight_mutex
{
private:
 
    critical_section cs_;
 
    lightweight_mutex(lightweight_mutex const &);
    lightweight_mutex & operator=(lightweight_mutex const &);
 
public:
 
    lightweight_mutex()
    {
#if BOOST_PLAT_WINDOWS_RUNTIME
        InitializeCriticalSectionEx(&cs_, 4000, 0);
#else
        InitializeCriticalSection(&cs_);
#endif
    }
 
    ~lightweight_mutex()
    {
        DeleteCriticalSection(&cs_);
    }
 
    class scoped_lock;
    friend class scoped_lock;
 
    class scoped_lock
    {
    private:
 
        lightweight_mutex & m_;
 
        scoped_lock(scoped_lock const &);
        scoped_lock & operator=(scoped_lock const &);
 
    public:
 
        explicit scoped_lock(lightweight_mutex & m): m_(m)
        {
            EnterCriticalSection(&m_.cs_);
        }
 
        ~scoped_lock()
        {
            LeaveCriticalSection(&m_.cs_);
        }
    };
};
 
} // namespace detail
 
} // namespace boost
 
#endif // #ifndef BOOST_SMART_PTR_DETAIL_LWM_WIN32_CS_HPP_INCLUDED