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LINUX C ʱ¼ä²Ù×÷

  1.ʱ¼ä±íʾ
    ÔÚ³ÌÐòµ±ÖÐ,ÎÒÃǾ­³£ÒªÊä³öϵͳµ±Ç°µÄʱ¼ä,±ÈÈçÎÒÃÇʹÓÃdateÃüÁîµÄÊä³ö½á¹û.Õâ¸öʱºòÎÒÃÇ¿ÉÒÔʹÓÃÏÂÃæÁ½¸öº¯Êý:
#include <sys/time.h>
time_t time(time_t *tloc);
char *ctime(const time_t *clock);
    timeº¯Êý·µ»Ø´Ó1970Äê1ÔÂ1ÈÕ0µãÒÔÀ´µÄÃëÊý.´æ´¢ÔÚtime_t½á¹¹Ö®ÖÐ.²»¹ýÕâ¸öº¯ÊýµÄ·µ»ØÖµ¶ÔÓÚÎÒÃÇÀ´ËµÃ»ÓÐʲôʵ¼ÊÒâÒå.Õâ¸öʱºòÎÒÃÇʹÓõڶþ¸öº¯Êý½«ÃëÊýת»¯Îª×Ö·û´®. Õâ¸öº¯ÊýµÄ·µ»ØÀàÐÍÊǹ̶¨µÄ:Ò»¸ö¿ÉÄÜֵΪ.Thu Dec7 14:58:59 2000 Õâ¸ö×Ö·û´®µÄ³¤¶ÈÊǹ̶¨µÄΪ26.
    2.ʱ¼äµÄ²âÁ¿
    ÓÐʱºòÎÒÃÇÒª¼ÆËã³ÌÐòÖ´ÐеÄʱ¼ä.±ÈÈçÎÒÃÇÒª¶ÔËã·¨½øÐÐʱ¼ä·ÖÎö.Õâ¸öʱºò¿ÉÒÔʹÓÃÏÂÃæÕâ¸öº¯Êý.
#include <sys/time.h>
int gettimeofday(struct timeval *tv,struct timezone *tz);
strut timeval {
long tv_sec; /* ÃëÊý */
long tv_usec; /* ΢ÃëÊý */
};
gettimeofday½«Ê±¼ä±£´æÔڽṹtvÖ®ÖÐ.tzÒ»°ãÎÒÃÇʹÓÃNULLÀ´´úÌæ.
#include #include #include
void function()
{
unsigned int i,j;
double y;
for(i=0;i<1000;i++)
for(j=0;j<1000;j++)
y=sin((double)i);
}
main()
{
struct timeval tpstart,tpend;
float timeuse;
gettimeofday(&tpstart,NULL);
function();
gettimeofday(&tpend,NULL);
timeuse=1000000*(tpend.tv_sec-tpstart.tv_sec)+
tpend.tv_usec-tpstart.tv_usec;
timeuse/=1000000;
printf("Used Time:%f\n",timeuse);
exit(0);
}
    Õâ¸ö³ÌÐòÊä³öº¯ÊýµÄÖ´ÐÐʱ¼ä,ÎÒÃÇ¿ÉÒÔʹÓÃÕâ¸öÀ´½øÐÐϵͳÐÔÄܵIJâÊÔ,»òÕßÊǺ¯ÊýËã·¨µÄЧÂÊ·ÖÎö.ÔÚÎÒ»úÆ÷ÉϵÄÒ»¸öÊä³ö½á¹ûÊÇ: Used Time:0.556070
 
  3.¼ÆÊ±Æ÷µÄʹÓÃ
    Linux²Ù×÷ϵͳΪÿһ¸ö½ø³ÌÌṩÁË3¸öÄÚ²¿¼ä¸ô¼ÆÊ±Æ÷.
      ITIMER_REAL:¼õÉÙʵ¼Êʱ¼ä.µ½Ê±µÄʱºò·¢³öSIGALRMÐźÅ.
      ITIMER_VIRTUAL:¼õÉÙÓÐЧʱ¼ä(½ø³ÌÖ´ÐеÄʱ¼ä).²úÉúSIGVTALRMÐźÅ.
      ITIMER_PROF:¼õÉÙ½ø³ÌµÄÓÐЧʱ¼äºÍϵͳʱ¼ä(Ϊ½ø³Ìµ÷¶ÈÓõÄʱ¼ä).Õâ¸ö¾­³£ºÍÉÏÃæÒ»¸öʹÓÃÓÃÀ´¼ÆËãϵͳÄÚºËʱ¼äºÍÓû§Ê±¼ä.²úÉúSIGPROFÐźÅ.
 


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