timer.c

定时器LINUX上的实现

/***************************COPYRIGHT (C)******************************
*                      PORCHESON TECH. CO.,LTD
*                      http://www.porcheson.com
****************************FILE INFO.*********************************
*	NAME	:	timer.c
*	VERSION	:	V1.0
*	DATE	:	2006.11.08
*	AUTHOR	:	pearli
*	DESP.	:	the interval timer
**********************************************************************/

#include "./include.h"

void StartIntervalTimer(void)
{
    static clock_t oldTick,currentTick;
    static INT32U  number;
    static FLOAT32 tp = 0;
    static FLOAT32 timeIntervalMin = 0.1;

    time_t timer;
    struct tm* timeCurr;
    
    tp = sysconf(_SC_CLK_TCK);

    currentTick = oldTick = times(NULL);
    number = 0;

    // 修正number
    do
    {
        timer = time(NULL);
        timeCurr = localtime(&timer);
        number = timeCurr->tm_sec * 10;
        timer = time(NULL);
        timeCurr = localtime(&timer);
    }
    while (number != timeCurr->tm_sec * 10);
    
    while (1)
    {
        currentTick = times(NULL);
        
        if (((FLOAT32)(currentTick - oldTick)
                / tp) > timeIntervalMin)
        {
            oldTick = currentTick;
            number++;

            if (number % 8 == 0)
            {
                CheckUsbOnLine();
                PostMessage(GetActiveWindow(),MSG_UPDATETIMER,0,0);
            }

            if (number % 600 == 0)
            {
                number = 0;
                timer = time(NULL);
                timeCurr = localtime(&timer);
                
                if (number != timeCurr->tm_sec * 10)
                {
                    do
                    {
                        timer = time(NULL);
                        timeCurr = localtime(&timer);
                        number = timeCurr->tm_sec * 10;
                        timer = time(NULL);
                        timeCurr = localtime(&timer);
                    }
                    while (number != timeCurr->tm_sec * 10);
                }
            }


            if (gstruSystem.hintLen && gstruSystem.isHint)
            {
                pthread_mutex_lock(&gMutexHintTime);
                
                // 编辑框获得焦点后等待0.3秒再弹出提示
                if (3 == gHintStartTime)
                {
                    PostMessage(GetActiveWindow(),SHOW_MHINT,0,0); 
                }
                
                if (gHintStartTime == gstruSystem.hintLen + 3)
                {
                    PostMessage(GetActiveWindow(),HIDE_MHINT,0,0);
                }

                if (gHintStartTime <= gstruSystem.hintLen + 3)
                {
                    gHintStartTime++;
                }
                pthread_mutex_unlock(&gMutexHintTime);
            }

            // for show speed, MUST not be deleted
            pthread_mutex_lock(&gMutexReDraw);
            if (1 == gReDrawTime)
            {
                PostMessage(GetActiveWindow(),MSG_REDRWA,0,0); 
            }
            if (++gReDrawTime > 2)
            {
                gReDrawTime = 2;
            }
            pthread_mutex_unlock(&gMutexReDraw);
        }
        
        // 延时0.005秒
        usleep(5000);
    }         
}