timer.hpp
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /* Copyright (C) 2003 MySQL AB
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /**
- * @class Timer
- * @brief A timer class that can't be fooled by NTP:ing the system clock to old time
- */
- class Timer {
- public:
- Timer() {
- m_delay = 10;
- };
- Timer(NDB_TICKS delay_time) {
- m_delay = delay_time;
- }
- /**
- * Set/Get alarm time of timer
- */
- inline void setDelay(NDB_TICKS delay_time) { m_delay = delay_time; }
- inline NDB_TICKS getDelay() { return m_delay; }
- /**
- * Start timer
- */
- inline void reset() {
- m_current_time = NdbTick_CurrentMillisecond();
- m_alarm_time = m_current_time + m_delay;
- }
-
- /**
- * Check for alarm
- */
- inline bool check() { return check(NdbTick_CurrentMillisecond()); }
- inline bool check(NDB_TICKS check_time) {
- /**
- * Standard alarm check
- */
- if (check_time > m_alarm_time) return true;
- /**
- * Time progressing, but it is not alarm time yet
- */
- if (check_time >= m_current_time) return false;
- /**
- * Time has moved backwards
- */
- reset();
- return false;
- }
- private:
- NDB_TICKS m_current_time;
- NDB_TICKS m_alarm_time;
- NDB_TICKS m_delay;
- };