greenplumn CTaskLocalStorage 源码
greenplumn CTaskLocalStorage 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/task/CTaskLocalStorage.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CTaskLocalStorage.h
//
// @doc:
// Task-local storage facility; implements TLS to store an instance
// of a subclass of CTaskLocalStorageObject by an enum index;
// no restrictions as to where the actual data is allocated,
// e.g. Task's memory pool, global memory etc.
//---------------------------------------------------------------------------
#ifndef GPOS_CTaskLocalStorage_H
#define GPOS_CTaskLocalStorage_H
#include "gpos/base.h"
#include "gpos/common/CSyncHashtable.h"
namespace gpos
{
// fwd declaration
class CTaskLocalStorageObject;
//---------------------------------------------------------------------------
// @class:
// CTaskLocalStorage
//
// @doc:
// TLS implementation; single instance of this class per task; initialized
// and destroyed during task setup/tear down
//
//---------------------------------------------------------------------------
class CTaskLocalStorage
{
public:
CTaskLocalStorage(const CTaskLocalStorage &) = delete;
enum Etlsidx
{
EtlsidxTest, // unittest slot
EtlsidxOptCtxt, // optimizer context
EtlsidxInvalid, // used only for hashtable iteration
EtlsidxSentinel
};
// ctor
CTaskLocalStorage() = default;
// dtor
~CTaskLocalStorage();
// reset
void Reset(CMemoryPool *mp);
// accessors
void Store(CTaskLocalStorageObject *);
CTaskLocalStorageObject *Get(const Etlsidx);
// delete object
void Remove(CTaskLocalStorageObject *);
// equality function -- used for hashtable
static BOOL
Equals(const CTaskLocalStorage::Etlsidx &idx,
const CTaskLocalStorage::Etlsidx &idx_other)
{
return idx == idx_other;
}
// hash function
static ULONG
HashIdx(const CTaskLocalStorage::Etlsidx &idx)
{
// keys are unique
return static_cast<ULONG>(idx);
}
// invalid Etlsidx
static const Etlsidx m_invalid_idx;
private:
// hash table
CSyncHashtable<CTaskLocalStorageObject, Etlsidx> m_hash_table;
}; // class CTaskLocalStorage
} // namespace gpos
#endif // !GPOS_CTaskLocalStorage_H
// EOF
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