c++ - 将 GetTickCount() vxWorks 转换为 Linux

Question

我正在将一些 vxWorks 代码移植到 Linux。

我看了这个answer它推荐 CLOCK_MONOTONIC .这是以下定义的合适替代品吗:

#define GetTickCount()    ((1000.0 * (double)tickGet())/((double)sysClkRateGet())))

?

Answer 1

GetTickCount是这样描述的 Windows API:

Retrieves the number of milliseconds that have elapsed since the system was started, up to 49.7 days

是的，CLOCK_MONOTONIC是要使用的正确 POSIX 时钟。这是未经测试的代码:

double GetTickCount(void) 
{
  struct timespec now;
  if (clock_gettime(CLOCK_MONOTONIC, &now))
    return 0;
  return now.tv_sec * 1000.0 + now.tv_nsec / 1000000.0;
}