sys/time.h移植代码

 

 

sys/time.h移植代码

      ----by wangsh

 

         在涉及跨平台的代码移植中，sys/time.h经常用到，这里简单列出我移植修改的代码，供大家丢砖头。

         本文仅提供visual studio平台下移植代码中常会遇到的sys/time.h找不到问题，相信这两个文件，你一定会用得着的。啥也不说了，上代码。

         微秒和纳秒部分没有实现，欢迎大家添加。

 

            sys/time.h

 

      

#include
#include
#ifdef WIN32
//#   include
#else
#   include
#endif

/*
* Structure used in select() call, taken from the BSD file sys/time.h.
*/
struct timeval {
 long    tv_sec;         /* seconds */
 long    tv_usec;        /* and microseconds */
};

#ifdef WIN32

//如果你的工程中的数据结构没有和windows.h中包含的相关数据结构重复，可以使用这段代码，不用使用time.cpp
void gettimeofday(struct timeval *tp, void *tzp);
/*
{
    time_t clock;
  
 struct tm tm;
    SYSTEMTIME wtm;

    GetLocalTime(&wtm);
    tm.tm_year     = wtm.wYear - 1900;
    tm.tm_mon     = wtm.wMonth - 1;
    tm.tm_mday     = wtm.wDay;
    tm.tm_hour     = wtm.wHour;
    tm.tm_min     = wtm.wMinute;
    tm.tm_sec     = wtm.wSecond;
    tm. tm_isdst    = -1;
    clock = mktime(&tm);
    tp->tv_sec = clock;
    tp->tv_usec = wtm.wMilliseconds * 1000;
}
*/

void timersub(struct timeval *endPre, struct timeval *beginPre, struct timeval *result);

void timeradd(struct timeval *endPre, struct timeval *beginPre, struct timeval *result);

#endif /* WIN32 */

 

 

//sys/time.cpp

 

#include "time.h"

#define CLKS_PER_SEC ((clock_t)1000)

void gettimeofday(struct timeval *tp, void *tzp)
{
 //time_t clock;
 //tm ttime;

 struct tm *newtime;
 time_t aclock;

 time_t clockn;

 time( &aclock );   // Get time in seconds
 newtime = localtime( &aclock );   // Convert time to struct tm form

 clockn = mktime(newtime);

 tp->tv_sec = clockn;

 double uS = (clock() / CLKS_PER_SEC) * 1000000;

 //tp->tv_usec = wtm.wMilliseconds * 1000;

 //struct tm tm;
  //  SYSTEMTIME wtm;

 //   GetLocalTime(&wtm);
 //   tm.tm_year     = wtm.wYear - 1900;
 //   tm.tm_mon     = wtm.wMonth - 1;
 //   tm.tm_mday     = wtm.wDay;
 //   tm.tm_hour     = wtm.wHour;
 //   tm.tm_min     = wtm.wMinute;
 //   tm.tm_sec     = wtm.wSecond;
 //   tm. tm_isdst    = -1;
 //   clock = mktime(&tm);
 //   tp->tv_sec = clock;
 //   tp->tv_usec = wtm.wMilliseconds * 1000;

}

void timersub(struct timeval *endPre, struct timeval *beginPre, struct timeval *result)
{
 do
 {                                                                       
  (result)->tv_sec = (endPre)->tv_sec - (beginPre)->tv_sec;                            
  (result)->tv_usec = (endPre)->tv_usec - (beginPre)->tv_usec;                         
  if ((result)->tv_usec < 0)
  {                                             
   --(result)->tv_sec;                                                    
   (result)->tv_usec += 1000000;                                          
  }                                                                        
 }
 while (0);

}

void timeradd(struct timeval *endPre, struct timeval *beginPre, struct timeval *result)
{
 do
 {                                                                       
  (result)->tv_sec = (endPre)->tv_sec + (beginPre)->tv_sec;                            
  (result)->tv_usec = (endPre)->tv_usec + (beginPre)->tv_usec;                         
  if ((result)->tv_usec >= 1000000)
  {                                             
   ++(result)->tv_sec;                                                    
   (result)->tv_usec -= 1000000;                                          
  }                                                                        
 }
 while (0);

}