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Leonid Fedorov
@ -51,40 +51,39 @@
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namespace BRM
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{
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struct MSTEntry
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{
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key_t tableShmkey;
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int allocdSize;
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int currentSize;
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EXPORT MSTEntry();
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key_t tableShmkey;
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int allocdSize;
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int currentSize;
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EXPORT MSTEntry();
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};
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class MasterSegmentTableImpl
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{
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public:
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~MasterSegmentTableImpl(){};
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static MasterSegmentTableImpl* makeMasterSegmentTableImpl(int key, int size);
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public:
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~MasterSegmentTableImpl(){};
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static MasterSegmentTableImpl* makeMasterSegmentTableImpl(int key, int size);
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static void refreshShm()
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static void refreshShm()
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{
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if (fInstance)
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{
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if (fInstance)
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{
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delete fInstance;
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fInstance = NULL;
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}
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delete fInstance;
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fInstance = NULL;
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}
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boost::interprocess::shared_memory_object fShmobj;
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boost::interprocess::mapped_region fMapreg;
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private:
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MasterSegmentTableImpl(int key, int size);
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MasterSegmentTableImpl(const MasterSegmentTableImpl& rhs);
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MasterSegmentTableImpl& operator=(const MasterSegmentTableImpl& rhs);
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}
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static boost::mutex fInstanceMutex;
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static MasterSegmentTableImpl* fInstance;
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boost::interprocess::shared_memory_object fShmobj;
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boost::interprocess::mapped_region fMapreg;
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private:
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MasterSegmentTableImpl(int key, int size);
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MasterSegmentTableImpl(const MasterSegmentTableImpl& rhs);
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MasterSegmentTableImpl& operator=(const MasterSegmentTableImpl& rhs);
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static boost::mutex fInstanceMutex;
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static MasterSegmentTableImpl* fInstance;
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};
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/** @brief This class regulates access to the BRM tables in shared memory
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@ -93,122 +92,121 @@ private:
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*/
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class MasterSegmentTable
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{
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public:
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/** @brief Constructor.
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* @note Throws runtime_error on a semaphore-related error.
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*/
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EXPORT MasterSegmentTable();
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EXPORT ~MasterSegmentTable();
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public:
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/** @brief Constructor.
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* @note Throws runtime_error on a semaphore-related error.
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*/
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EXPORT MasterSegmentTable();
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EXPORT ~MasterSegmentTable();
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/// specifies the Extent Map table
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static const int EMTable = 0;
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/// specifies the Extent Map's Freelist table
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static const int EMFreeList = 1;
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/// specifies the Version Buffer Block Map segment
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static const int VBBMSegment = 2;
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/// specifies the Version Substitution Structure segment
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static const int VSSSegment = 3;
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/// specifies the copy lock segment
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static const int CLSegment = 4;
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/// the number of tables currently defined
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static const int nTables = 5;
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/// specifies the Extent Map table
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static const int EMTable = 0;
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/// specifies the Extent Map's Freelist table
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static const int EMFreeList = 1;
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/// specifies the Version Buffer Block Map segment
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static const int VBBMSegment = 2;
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/// specifies the Version Substitution Structure segment
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static const int VSSSegment = 3;
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/// specifies the copy lock segment
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static const int CLSegment = 4;
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/// the number of tables currently defined
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static const int nTables = 5;
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/** @brief This function gets the specified table.
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*
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* This function gets the specified table and grabs the
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* associated read lock.
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* @param num EMTable, EMFreeList, or VBBMTable
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* @param block If false, it won't block.
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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* @return If block == true, it always returns the specified MSTEntry;
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* if block == false, it can also return NULL if it could not grab
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* the table's lock.
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*/
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EXPORT MSTEntry* getTable_read(int num, bool block = true) const;
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/** @brief This function gets the specified table.
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*
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* This function gets the specified table and grabs the
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* associated read lock.
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* @param num EMTable, EMFreeList, or VBBMTable
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* @param block If false, it won't block.
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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* @return If block == true, it always returns the specified MSTEntry;
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* if block == false, it can also return NULL if it could not grab
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* the table's lock.
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*/
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EXPORT MSTEntry* getTable_read(int num, bool block = true) const;
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/** @brief This function gets the specified table.
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*
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* This function gets the specified table and grabs the
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* associated write lock.
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* @param num EMTable, EMFreeList, or VBBMTable
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* @param block If false, it won't block.
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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* @return If block == true, it always returns the specified MSTEntry;
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* if block == false, it can also return NULL if it could not grab
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* the table's lock.
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*/
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EXPORT MSTEntry* getTable_write(int num, bool block = true) const;
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/** @brief This function gets the specified table.
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*
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* This function gets the specified table and grabs the
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* associated write lock.
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* @param num EMTable, EMFreeList, or VBBMTable
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* @param block If false, it won't block.
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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* @return If block == true, it always returns the specified MSTEntry;
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* if block == false, it can also return NULL if it could not grab
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* the table's lock.
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*/
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EXPORT MSTEntry* getTable_write(int num, bool block = true) const;
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/** @brief Upgrade a read lock to a write lock.
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*
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* Upgrade a read lock to a write lock. This is not an atomic
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* operation.
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* @param num The table the caller holds the read lock to.
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*/
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EXPORT void getTable_upgrade(int num) const;
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/** @brief Upgrade a read lock to a write lock.
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*
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* Upgrade a read lock to a write lock. This is not an atomic
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* operation.
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* @param num The table the caller holds the read lock to.
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*/
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EXPORT void getTable_upgrade(int num) const;
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/** @brief Downgrade a write lock to a read lock.
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*
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* Downgrade a write lock to a read lock. This is an atomic
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* operation.
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* @param num The table the caller holds the write lock to.
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*/
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EXPORT void getTable_downgrade(int num) const;
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/** @brief Downgrade a write lock to a read lock.
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*
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* Downgrade a write lock to a read lock. This is an atomic
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* operation.
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* @param num The table the caller holds the write lock to.
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*/
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EXPORT void getTable_downgrade(int num) const;
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/** @brief This function unlocks the specified table.
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*
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* This function unlocks the specified table.
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*
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* @param num EMTable, EMFreeList, or VBBMTable
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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*/
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EXPORT void releaseTable_read(int num) const;
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/** @brief This function unlocks the specified table.
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*
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* This function unlocks the specified table.
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*
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* @param num EMTable, EMFreeList, or VBBMTable
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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*/
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EXPORT void releaseTable_read(int num) const;
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/** @brief This function unlocks the specified table.
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*
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* This function unlocks the specified table.
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*
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* @param num EMTable, EMFreeList, or VBBMTable
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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*/
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EXPORT void releaseTable_write(int num) const;
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/** @brief This function unlocks the specified table.
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*
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* This function unlocks the specified table.
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*
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* @param num EMTable, EMFreeList, or VBBMTable
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* @note throws invalid_argument if num is outside the valid range
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* and runtime_error on a semaphore-related error.
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*/
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EXPORT void releaseTable_write(int num) const;
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/** @brief This function gets the current VSS key out of shared memory without locking
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*
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* This function gets the current VSS key out of shared memory without any locking. It is used
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* (eventually) by DBRM::vssLookup() to try and correctly & efficiently short-circuit a vss
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* lookup when there are no locked blocks in the vss. This read should be atomic. Even if it's
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* not, we should still be okay.
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*/
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inline key_t getVSSShmkey() const
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{
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return fShmDescriptors[VSSSegment].tableShmkey;
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}
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/** @brief This function gets the current VSS key out of shared memory without locking
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*
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* This function gets the current VSS key out of shared memory without any locking. It is used
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* (eventually) by DBRM::vssLookup() to try and correctly & efficiently short-circuit a vss
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* lookup when there are no locked blocks in the vss. This read should be atomic. Even if it's
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* not, we should still be okay.
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*/
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inline key_t getVSSShmkey() const
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{
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return fShmDescriptors[VSSSegment].tableShmkey;
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}
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private:
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MasterSegmentTable(const MasterSegmentTable& mst);
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MasterSegmentTable& operator=(const MasterSegmentTable& mst);
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private:
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MasterSegmentTable(const MasterSegmentTable& mst);
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MasterSegmentTable& operator=(const MasterSegmentTable& mst);
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int shmid;
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mutable boost::scoped_ptr<rwlock::RWLock> rwlock[nTables];
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int shmid;
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mutable boost::scoped_ptr<rwlock::RWLock> rwlock[nTables];
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static const int MSTshmsize = nTables * sizeof(MSTEntry);
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int RWLockKeys[nTables];
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static const int MSTshmsize = nTables * sizeof(MSTEntry);
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int RWLockKeys[nTables];
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/// indexed by EMTable, EMFreeList, and VBBMTable
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MSTEntry* fShmDescriptors;
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/// indexed by EMTable, EMFreeList, and VBBMTable
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MSTEntry* fShmDescriptors;
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void makeMSTSegment();
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void initMSTData();
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ShmKeys fShmKeys;
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MasterSegmentTableImpl* fPImpl;
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void makeMSTSegment();
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void initMSTData();
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ShmKeys fShmKeys;
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MasterSegmentTableImpl* fPImpl;
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};
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} //namespace
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} // namespace BRM
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#undef EXPORT
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