從PCI上讀取數據 線程和定時器效率

線程：

?mythread=AfxBeginThread(StartContinuous,(LPVOID)1,THREAD_PRIORITY_NORMAL,0,CREATE_SUSPENDED);
?mythread->ResumeThread();

UINT StartContinuous(LPVOID pParam)
{?HWND hWnd=(HWND) pParam;
?int len=0;
?FILE *fp;

?i=0;
?while(threadenable)
?{

??len = CPCI6312_ReadData(buf);
??if (len>0)
??{??
???reccnt += len;
???fwrite(buf,1,len,fp);
??}
?}

?len = CPCI6312_ReadLastData(buf);
?if (len>0)
?{
??reccnt += len;
??fwrite(buf,1,len,fp);
?}
?fflush(fp);
?fclose(fp);
?AfxMessageBox("end",MB_OK,NULL);

?return 0;
}

計數器方式：

void CDemo2Dlg::OnTimer(UINT nIDEvent)
{
?// TODO: Add your message handler code here and/or call default
?if(nIDEvent==1)//更新記錄數據
?{
??runsec++;
??str.Format("record:%d (%d)",reccnt,runsec);
??m_list.AddString(str);
?}
?

?if (nIDEvent==2)//采集數據
?{
??len = CPCI6312_ReadData(buf);
??if (len>0)
??{??
???reccnt += len;
???fwrite(buf,1,len,fp);
??}
?}
?CDialog::OnTimer(nIDEvent);
}

同樣的數據量，線程方式居然占用CPU 80% 以上，而計數器不到30%。

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從PCI上讀取數據 線程和定時器效率