mirror of
https://github.com/FirebirdSQL/firebird.git
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113 lines
2.8 KiB
C++
113 lines
2.8 KiB
C++
/*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Dmitry Yemanov
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2006 Dmitry Yemanov <dimitr@users.sf.net>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#ifndef JRD_DATABASE_SNAPSHOT_H
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#define JRD_DATABASE_SNAPSHOT_H
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#include "../common/classes/array.h"
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#include "../common/classes/ClumpletReader.h"
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#include "../common/classes/ClumpletWriter.h"
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namespace Jrd {
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class DatabaseSnapshot {
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struct RelationData {
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int rel_id;
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RecordBuffer* data;
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};
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class SharedMemory {
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static const size_t VERSION;
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static const size_t DEFAULT_SIZE;
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static const size_t SEMAPHORES;
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struct Header {
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size_t version;
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size_t length;
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#ifndef WIN_NT
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MTX_T mutex;
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#endif
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};
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public:
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SharedMemory();
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~SharedMemory();
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void acquire();
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void release();
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Firebird::ClumpletReader* readData(thread_db*);
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void writeData(thread_db*, Firebird::ClumpletWriter&);
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private:
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// copying is prohibited
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SharedMemory(const SharedMemory&);
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SharedMemory& operator =(const SharedMemory&);
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void garbageCollect(thread_db*, bool);
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void extend(size_t);
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static void checkMutex(const TEXT*, int);
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static void init(void*, SH_MEM_T*, bool);
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SH_MEM_T handle;
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#ifdef WIN_NT
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MTX_T mutex;
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#endif
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Header* base;
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};
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public:
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~DatabaseSnapshot();
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RecordBuffer* getData(const jrd_rel*) const;
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static DatabaseSnapshot* create(thread_db*);
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static int blockingAst(void*);
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protected:
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DatabaseSnapshot(thread_db*, MemoryPool&, jrd_tra*);
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private:
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RecordBuffer* allocBuffer(thread_db*, MemoryPool&, int);
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void clearRecord(Record*);
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void putField(Record*, int, const void*, size_t);
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static Firebird::ClumpletReader* dumpData(thread_db*, bool);
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static const char* checkNull(int, int, const char*, size_t);
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static void putDatabase(Database*, Firebird::ClumpletWriter&);
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static void putAttachment(Attachment*, Firebird::ClumpletWriter&);
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static void putTransaction(jrd_tra*, Firebird::ClumpletWriter&);
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static void putRequest(jrd_req*, Firebird::ClumpletWriter&);
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static Firebird::Mutex initMutex;
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static SharedMemory* dump;
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jrd_tra* transaction;
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Firebird::Array<RelationData> snapshot;
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};
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} // namespace
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#endif // JRD_DATABASE_SNAPSHOT_H
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