clock_t

< c‎ | chrono
定义于头文件 <time.h>
typedef /* unspecified */ clock_t;

足以表示进程所用的处理器时间的算术 (C11 前)实数 (C11 起)类型。它拥有实现定义的范围和精度。

示例

#include <stdio.h>
#include <time.h>
 
volatile unsigned sink;
int main (void)
{
  clock_t start = clock();
 
  for(size_t i=0; i<10000000; ++i)
      sink++;
 
  clock_t end = clock();
  double cpu_time_used = ((double) (end - start)) / CLOCKS_PER_SEC;
 
  printf("for loop took %f seconds to execute \n", cpu_time_used);
}

可能的输出:

for loop took 0.033492 seconds to execute

引用

  • C11 standard (ISO/IEC 9899:2011):
  • 7.27.1/3 Components of time (p: 388)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.23.1/3 Components of time (p: 338)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.12.1 Components of time

参阅

返回未加工的程序启动时开始经过的处理器时间
(函数)
处理器每秒的时间计数
(宏常量)