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Ò»)ANSI clockº¯Êý
1)¸ÅÊö:
clock º¯ÊýµÄ·µ»ØÖµÀàÐÍÊÇclock_t,Ëü³ýÒÔCLOCKS_PER_SECÀ´µÃ³öʱ¼ä,Ò»°ãÓÃÁ½´Îclockº¯ÊýÀ´¼ÆËã½ø³Ì×ÔÉíÔËÐеÄʱ¼ä.
ANSI clockÓÐÈý¸öÎÊÌâ:
1)Èç¹û³¬¹ýÒ»¸öСʱ,½«Òªµ¼ÖÂÒç³ö.
2)º¯ÊýclockûÓп¼ÂÇCPU±»×Ó½ø³ÌʹÓõÄÇé¿ö.
3)Ò²²»ÄÜÇø·ÖÓû§¿Õ¼äºÍÄں˿ռä.
ËùÒÔclockº¯ÊýÔÚlinuxϵͳÉϱäµÃûÓÐÒâÒå.
2)²âÊÔ
±àдtest1.c³ÌÐò,²âÊÔ²ÉÓÃclockº¯ÊýµÄÊä³öÓëtime³ÌÐòµÄÇø±ð.
vi test1.c
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main( void )
{
   long i=1000L;
   clock_t start, finish;
   double  duration;
   printf( "Time to do %ld empty loops is ", i );
   start = clock();
   while (--i){
    system("cd");
   }
   finish = clock();
   duration = (double)(finish - start) / CLOCKS_PER_SEC;
   printf( "%f seconds\n", duration );
   return 0;
}
gcc test1.c -o test1
time ./test1
Time to do 1000 empty loops is 0.180000 seconds
real    0m3.492s
user    0m0.512s
sys     0m2.972s
3)×ܽá:
(1)³ÌÐòµ÷Óà system("cd");£¬ÕâÀïÖ÷ÒªÊÇϵͳģʽ×Ó½ø³ÌµÄÏûºÄ,test1³ÌÐò²»ÄÜÌåÏÖÕâÒ»µã.
(2)0.180000 secondsÃëµÄÏûºÄÊÇÁ½´Îclock()º¯Êýµ÷ÓóýÒÔCLOCKS_PER_SEC.
(3)clock()º¯Êý·µ»ØÖµÊÇÒ»¸öÏà¶Ôʱ¼ä£¬¶ø²»ÊǾø¶Ôʱ¼ä.
(4)CLOCKS_PER_SECÊÇϵͳ¶¨ÒåµÄºê£¬ÓÉGNU±ê×¼¿â¶¨ÒåΪ1000000.
¶þ)times()ʱ¼äº¯Êý
1)¸ÅÊö:
Ô­ÐÍÈçÏ£º
clock_t times(struct tms *buf);
tms½á¹¹ÌåÈçÏÂ:
strace tms{
 clock_t tms_utime;
 clock_t tms_stime;
 clock_t tms_cutime;
 clock_t tms_cstime;
}
×¢ÊÍ:
tms_utime¼Ç¼µÄÊǽø³ÌÖ´ÐÐÓû§´úÂëµÄʱ¼ä.
tms_stime¼Ç¼µÄÊǽø³ÌÖ´ÐÐÄں˴úÂëµÄʱ¼ä.
tms_cutime¼Ç¼µÄÊÇ×Ó½ø³ÌÖ´ÐÐÓû§´úÂëµÄʱ¼ä.
tms_cstime¼Ç¼µÄÊÇ×Ó½ø³ÌÖ´ÐÐÄں˴úÂëµÄʱ¼ä.
2)²âÊÔ:
vi test2.c
#include <sys/times.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
static void do_cmd(char *);
st


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GNU glibcÌṩһ¸ö¶ÔprintfµÄÀ©Õ¹£¬Ö±½Óprintf("%m"),¿ÉÒÔÊä³ö±ê×¼µÄ´íÎóÐÅÏ¢£¬ÀýÈçÏÂÃæ£º
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
int main()
{
         ......

Red Hat Linux ѧϰ±Ê¼Ç


Red Hat Linux Ñ§Ï°±Ê¼Ç
 
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3.       ......

linuxϰ´Ï¼üÍ˳öwhileÑ­»·(ÀàËÆÓÚ_kbhit)

#include <stdio.h>
#include <sys/select.h>
#include <termios.h>
#include <unistd.h>
#include <ctype.h>
#define STDIN     0
int main()
{
    struct timeval tv = {0,0};
    struct termios term , termbak;
 & ......

Linux °²×°tomcat

Linux tomcat¶ÔÓÚµçÄÔʹÓõÄÍæ¼ÒµÄ³£ÓÃÈí¼þ£¬È»ºóÎÒ¾Íѧϰ¼°ÉîÈëµÄÑо¿Linux tomcat£¬ÔÚÕâÀïºÍ´ó¼ÒÒ»Æð̽ÌÖLinux tomcatµÄʹÓ÷½·¨£¬Ï£Íû¶Ô´ó¼ÒÓÐÓᣲÙ×÷ϵͳ£ºRedhat Linux(Fedora Core 2)JDK: j2sdk-1_4_2_01-linux-i586.bin Linux tomcat:jakarta-Linux tomcat-5.0.19.tar.gz
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JDK:
1£©½«°²×°³ÌÐò¸´ÖƵ½ /u ......

xp+vmware+linuxµÄÍøÂçÁ¬½Ó

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