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100 lines
2.1 KiB
C++
100 lines
2.1 KiB
C++
/*
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* PROGRAM: Firebird Trace Services
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* MODULE: TraceLog.h
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* DESCRIPTION: Trace API shared log file
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*
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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 Khorsun Vladyslav
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2008 Khorsun Vladyslav <hvlad@users.sourceforge.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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*/
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#ifndef TRACE_LOG
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#define TRACE_LOG
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#include "../../common/classes/fb_string.h"
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#include "../../jrd/isc.h"
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namespace Jrd {
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class TraceLog
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{
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public:
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TraceLog(Firebird::MemoryPool& pool, const Firebird::PathName& fileName, bool reader);
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virtual ~TraceLog();
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size_t read(void* buf, size_t size);
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size_t write(const void* buf, size_t size);
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// returns approximate log size in MB
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size_t getApproxLogSize() const;
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private:
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static void checkMutex(const TEXT*, int);
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static void initShMem(void*, sh_mem*, bool);
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void lock();
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void unlock();
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int openFile(int fileNum);
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int removeFile(int fileNum);
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struct ShMemHeader
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{
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volatile unsigned int readFileNum;
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volatile unsigned int writeFileNum;
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#ifndef WIN_NT
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struct mtx mutex;
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#endif
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};
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sh_mem m_handle;
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ShMemHeader* m_base;
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#ifdef WIN_NT
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struct mtx m_mutex;
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#endif
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Firebird::PathName m_baseFileName;
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unsigned int m_fileNum;
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int m_fileHandle;
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bool m_reader;
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class TraceLogGuard
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{
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public:
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explicit TraceLogGuard(TraceLog* log) : m_log(*log)
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{
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m_log.lock();
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}
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~TraceLogGuard()
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{
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m_log.unlock();
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}
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private:
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TraceLog& m_log;
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};
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};
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} // namespace Jrd
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#endif // TRACE_LOG
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