greenplumn CTaskId 代码
文件路径：/src/backend/gporca/libgpos/include/gpos/task/CTaskId.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2010 Greenplum, Inc.
/
/ @filename:
/ CTaskId.h
/
/ @doc:
/ Abstraction of task identification
/---------------------------------------------------------------------------
#ifndef GPOS_CTaskId_H
#define GPOS_CTaskId_H
#include "gpos/types.h"
#include "gpos/utils.h"
namespace gpos
{
/---------------------------------------------------------------------------
/ @class:
/ CTaskId
/
/ @doc:
/ Identification class; uses a serial number.
/
/---------------------------------------------------------------------------
class CTaskId
{
private:
/ task id
ULONG_PTR m_task_id;
/ atomic counter
static ULONG_PTR m_counter;
public:
/ ctor
CTaskId() : m_task_id(m_counter++)
{
}
/ simple comparison
BOOL
Equals(const CTaskId &tid) const
{
return m_task_id == tid.m_task_id;
}
/ comparison operator
inline BOOL
operator==(const CTaskId &tid) const
{
return this->Equals(tid);
}
/ comparison function; used in hashtables
static BOOL
Equals(const CTaskId &tid, const CTaskId &other)
{
return tid == other;
}
/ primitive hash function
static ULONG
HashValue(const CTaskId &tid)
{
return gpos::HashValue<ULONG_PTR>(&tid.m_task_id);
}
/ invalid id
static const CTaskId m_invalid_tid;
}; / class CTaskId
} / namespace gpos
#endif / !GPOS_CTaskId_H
/ EOF
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