#include "clock_time.h"
/*
#include <time.h>
获取指定类型时钟的精确度
int clock_getres(clockid_t clk_id, struct timespec *res);
取得和设置clk_id指定的时间
int clock_gettime(clockid_t clk_id, struct timespec *tp);
int clock_settime(clockid_t clk_id, const struct timespec *tp);
Link with -lrt.
CLOCK_BOOTTIME: 从系统启动这一刻开始计时，包括休眠时间，受到settimeofday的影响。
CLOCK_REALTIME
System-wide real-time clock. Setting this clock requires appropriate privi‐
leges.
统实时时间,随系统实时时间改变而改变,即从UTC1970-1-1 0:0:0开始计时,中间时刻如果系统时间被用户该成其他,则对应的时间相应改变
CLOCK_MONOTONIC
Clock that cannot be set and represents monotonic time since some unspecified
starting point.
从系统启动这一刻起开始计时,不受系统时间被用户改变的影响
CLOCK_MONOTONIC_RAW (since Linux 2.6.28; Linux-specific)
Similar to CLOCK_MONOTONIC, but provides access to a raw hardware-based time
that is not subject to NTP adjustments.
与CLOCK_MONOTONIC一样，系统开启时计时，但不受NTP影响，受adjtime影响。
CLOCK_MONOTONIC_COARSE: 如同CLOCK_MONOTONIC，但有更快的获取速度和更低
一些的精确度。受NTP影响。
CLOCK_PROCESS_CPUTIME_ID
High-resolution per-process timer from the CPU.
本进程到当前代码系统CPU花费的时间
CLOCK_THREAD_CPUTIME_ID
Thread-specific CPU-time clock.
本线程到当前代码系统CPU花费的时间
return 0 for success, or -1 for failure
其他函数
date(1), adjtimex(2), gettimeofday(2), settimeofday(2), time(2), clock_getcpu‐
clockid(3), ctime(3), ftime(3), pthread_getcpuclockid(3), sysconf(3), time(7)
*/
/*
struct timespec
{
time_t tv_sec; // 秒
long tv_nsec; // 纳秒
};
*/
// 获得毫秒数 注:编译时需添加 -lrt
unsigned long ClockGetTime_second(int clk_id)
{
struct timespec ts;
clock_gettime(clk_id, &ts);
return(ts.tv_sec+ts.tv_nsec/1000000000);
}
// 获得毫秒数 注:编译时需添加 -lrt
unsigned long ClockGetTime_ms(int clk_id)
{
struct timespec ts;
clock_gettime(clk_id, &ts);
return(ts.tv_sec*1000+ts.tv_nsec/1000000);
}
// 获得微秒数
unsigned long ClockGetTime_us(int clk_id)
{
struct timespec ts;
clock_gettime(clk_id, &ts);
return(ts.tv_sec*1000000+ts.tv_nsec/1000);
}
// 获得纳秒数
unsigned long ClockGetTime_ns(int clk_id)
{
struct timespec ts;
clock_gettime(clk_id, &ts);
return(ts.tv_sec*1000*1000*1000+ts.tv_nsec);
}
#if 0
int main()
{
sleep(2);
printf("TTT------------ms------------\n");
printf("TTT--CLOCK_REALTIME-----------[%lu]\n", GetTickCount_ms(CLOCK_REALTIME));
printf("TTT--CLOCK_MONOTONIC----------[%lu]\n", GetTickCount_ms(CLOCK_MONOTONIC));
printf("TTT--CLOCK_MONOTONIC_RAW------[%lu]\n", GetTickCount_ms(CLOCK_MONOTONIC_RAW));
printf("TTT--CLOCK_PROCESS_CPUTIME_ID-[%lu]\n", GetTickCount_ms(CLOCK_PROCESS_CPUTIME_ID));
printf("TTT--CLOCK_THREAD_CPUTIME_ID--[%lu]\n", GetTickCount_ms(CLOCK_THREAD_CPUTIME_ID));
printf("\nTTT------------us------------\n");
printf("TTT--CLOCK_REALTIME-----------[%lu]\n", GetTickCount_us(CLOCK_REALTIME));
printf("TTT--CLOCK_MONOTONIC----------[%lu]\n", GetTickCount_us(CLOCK_MONOTONIC));
printf("TTT--CLOCK_MONOTONIC_RAW------[%lu]\n", GetTickCount_us(CLOCK_MONOTONIC_RAW));
printf("TTT--CLOCK_PROCESS_CPUTIME_ID-[%lu]\n", GetTickCount_us(CLOCK_PROCESS_CPUTIME_ID));
printf("TTT--CLOCK_THREAD_CPUTIME_ID--[%lu]\n", GetTickCount_us(CLOCK_THREAD_CPUTIME_ID));
printf("\nTTT------------ns------------\n");
printf("TTT--CLOCK_REALTIME-----------[%lu]\n", GetTickCount_ns(CLOCK_REALTIME));
printf("TTT--CLOCK_MONOTONIC----------[%lu]\n", GetTickCount_ns(CLOCK_MONOTONIC));
printf("TTT--CLOCK_MONOTONIC_RAW------[%lu]\n", GetTickCount_ns(CLOCK_MONOTONIC_RAW));
printf("TTT--CLOCK_PROCESS_CPUTIME_ID-[%lu]\n", GetTickCount_ns(CLOCK_PROCESS_CPUTIME_ID));
printf("TTT--CLOCK_THREAD_CPUTIME_ID--[%lu]\n", GetTickCount_ns(CLOCK_THREAD_CPUTIME_ID));
return 0;
}
#endif
