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sync.h

00001 //-< SYNC.H >--------------------------------------------------------*--------*
00002 // FastDB                    Version 1.0         (c) 1999  GARRET    *     ?  *
00003 // (Main Memory Database Management System)                          *   /\|  *
00004 //                                                                   *  /  \  *
00005 //                          Created:     20-Nov-98    K.A. Knizhnik  * / [] \ *
00006 //                          Last update: 20-Dec-98    K.A. Knizhnik  * GARRET *
00007 //-------------------------------------------------------------------*--------*
00008 // Intertask synchonization primitives
00009 //-------------------------------------------------------------------*--------*
00010 
00011 #ifndef __SYNC_H__
00012 #define __SYNC_H__
00013 
00014 #ifdef _WIN32
00015 #include "sync_w32.h"    
00016 #else // Unix
00017 #include "sync_unix.h"
00018 #endif
00019 
00020 BEGIN_FASTDB_NAMESPACE
00021 
00022 class FASTDB_DLL_ENTRY dbSystem { 
00023   public:
00024     static unsigned getCurrentTimeMsec();
00025 };
00026 
00027 // Common decls for all platforms
00028 class FASTDB_DLL_ENTRY dbCriticalSection { 
00029   private:
00030     dbMutex& mutex;
00031   public:
00032     dbCriticalSection(dbMutex& guard) : mutex(guard) {
00033         mutex.lock();
00034     }
00035     ~dbCriticalSection() { 
00036         mutex.unlock();
00037     }
00038 };
00039         
00040 #define SMALL_BUF_SIZE 512
00041 
00042 class FASTDB_DLL_ENTRY dbSmallBuffer { 
00043   protected:
00044     char   smallBuf[SMALL_BUF_SIZE];
00045     char*  buf;
00046     size_t used;
00047 
00048   public:
00049     dbSmallBuffer(size_t size) { 
00050         if (size > SMALL_BUF_SIZE) { 
00051             buf = new char[size];
00052         } else { 
00053             buf = smallBuf;
00054         }
00055         used = size;
00056     }
00057 
00058     dbSmallBuffer() { 
00059         used = 0;
00060         buf = smallBuf;
00061     }
00062 
00063     void put(size_t size) { 
00064         if (size > SMALL_BUF_SIZE && size > used) { 
00065             if (buf != smallBuf) { 
00066                 delete[] buf;
00067             }
00068             buf = new char[size];
00069             used = size;
00070         }
00071     }
00072 
00073     operator char*() { return buf; }
00074     char* base() { return buf; }
00075 
00076     ~dbSmallBuffer() { 
00077         if (buf != smallBuf) { 
00078             delete[] buf;
00079         }
00080     }
00081 };
00082 
00083 class dbThreadPool;
00084 
00085 class FASTDB_DLL_ENTRY dbPooledThread { 
00086   private:
00087     friend class dbThreadPool;
00088 
00089     dbThread                thread;
00090     dbThreadPool*           pool;
00091     dbPooledThread*         next;
00092     dbThread::thread_proc_t f;
00093     void*                   arg;
00094     bool                    running;
00095     dbLocalSemaphore        startSem;
00096     dbLocalSemaphore        readySem;
00097     
00098     static void thread_proc  pooledThreadFunc(void* arg);
00099 
00100     void run();
00101     void stop();
00102 
00103     dbPooledThread(dbThreadPool* threadPool); 
00104     ~dbPooledThread(); 
00105 };
00106 
00107 class FASTDB_DLL_ENTRY dbThreadPool { 
00108     friend class dbPooledThread;
00109     dbPooledThread* freeThreads;
00110     dbMutex         mutex;
00111 
00112   public:
00113     dbPooledThread* create(dbThread::thread_proc_t f, void* arg);
00114     void join(dbPooledThread* thr);
00115     dbThreadPool();
00116     ~dbThreadPool();
00117 };    
00118 
00119 END_FASTDB_NAMESPACE
00120     
00121 #endif // __SYNC_H__
00122 
00123 

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