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# CriticalSection.h

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    00001 //------------------------------------------------------------------------------
    00002 // Lamp : Open source game middleware
    00003 // Copyright (C) 2004  Junpei Ohtani ( Email : junpee@users.sourceforge.jp )
    00004 //
    00005 // This library is free software; you can redistribute it and/or
    00006 // modify it under the terms of the GNU Lesser General Public
    00007 // License as published by the Free Software Foundation; either
    00008 // version 2.1 of the License, or (at your option) any later version.
    00009 //
    00010 // This library is distributed in the hope that it will be useful,
    00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    00013 // Lesser General Public License for more details.
    00014 //
    00015 // You should have received a copy of the GNU Lesser General Public
    00016 // License along with this library; if not, write to the Free Software
    00017 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00018 //------------------------------------------------------------------------------
    00019
    00020 /** @file
    00021  * クリティカルセクションヘッダ
    00022  * @author Junpee
    00023  */
    00024
    00025 #ifndef CRITICAL_SECTION_H_
    00026 #define CRITICAL_SECTION_H_
    00027
    00028 #include <Core/Thread/LockObject.h>
    00029
    00030 namespace Lamp{
    00031
    00032 //------------------------------------------------------------------------------
    00033 /**
    00034  * クリティカルセクション
    00035  */
    00036 class CriticalSection : public LockObject{
    00037 public:
    00038     /**
    00039      * コンストラクタ
    00040      */
    00041     CriticalSection() : lockCount_(0), threadID_(invalidThreadID){
    00042         ::InitializeCriticalSection(&criticalSection_);
    00043     }
    00044
    00045     /**
    00046      * デストラクタ
    00047      */
    00048     virtual ~CriticalSection(){
    00049         Assert(threadID_ == invalidThreadID);
    00050         Assert(lockCount_ == 0);
    00051         ::DeleteCriticalSection(&criticalSection_);
    00052     }
    00053
    00054     /**
    00055      * ロック
    00056      */
    00057     virtual void lock(){
    00058         ::EnterCriticalSection(&criticalSection_);
    00059         lockCount_++;
    00060         threadID_ = ::GetCurrentThreadId();
    00061     }
    00062
    00063     /**
    00064      * アンロック
    00065      */
    00066     virtual void unlock(){
    00067         Assert(lockCount_ > 0);
    00068         lockCount_--;
    00069         if(lockCount_ == 0){ threadID_ = invalidThreadID; }
    00070         ::LeaveCriticalSection(&criticalSection_);
    00071     }
    00072
    00073     /**
    00074      * カレントスレッドによってロックされているか
    00075      * @return カレントスレッドによってロックされていればtrue
    00076      */
    00077     virtual bool isLockedByCurrentThread() const{
    00078         return (::GetCurrentThreadId() == threadID_);
    00079     }
    00080
    00081 protected:
    00082     /// クリティカルセクションメンバ
    00083     CRITICAL_SECTION criticalSection_;
    00084     /// ロックカウント
    00085     int lockCount_;
    00086     /// スレッドID
    00087     u_int threadID_;
    00088
    00089     /// 無効なスレッドID
    00090     static const u_int invalidThreadID = 0xffffffff;
    00091
    00092 };
    00093
    00094 //------------------------------------------------------------------------------
    00095 } // End of namespace Lamp
    00096 #endif // End of CRITICAL_SECTION_H_
    00097 //------------------------------------------------------------------------------