本文介绍了正常运行时间iOS目标C - 毫秒级精度的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧! 问题描述 29岁程序员,3月因学历无情被辞! 我正在尝试获得iOS的正常运行时间。我正在使用mach_absolute_time - 但我发现它在睡眠时暂停了。I'm trying to get uptime for iOS. I was using mach_absolute_time - but I found that it paused during sleep.我找到了这个片段:- (time_t)uptime{ struct timeval boottime; int mib[2] = {CTL_KERN, KERN_BOOTTIME}; size_t size = sizeof(boottime); time_t now; time_t uptime = -1; (void)time(&now); if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 && boottime.tv_sec != 0) { uptime = now - boottime.tv_sec; } return uptime;}它可以解决问题。但是,它整整回来了。有没有办法从这里获得毫秒?It does the trick. BUT, it's returning whole seconds. Any way to get milliseconds out of this?谢谢!推荐答案内核(显然)不存储其启动时间的更高分辨率时间戳。The kernel does not (apparently) store a higher-resolution timestamp of its boot time. KERN_BOOTTIME 已实施通过 sysctl_boottime 函数在 bsd / kern / kern_sysctl.c 。它调用 boottime_sec 。KERN_BOOTTIME is implemented by the sysctl_boottime function in bsd/kern/kern_sysctl.c. It calls boottime_sec. boottime_sec 在 bsd / kern / kern_time.c 。它调用 clock_get_boottime_nanotime ,它有一个很有希望的名字。boottime_sec is implemented in bsd/kern/kern_time.c. It calls clock_get_boottime_nanotime, which has a promising name. clock_get_boottime_nanotime 在 osfmk /克恩/ clock.c 。硬编码总是在 nanosecs 参数中返回0。 这篇关于正常运行时间iOS目标C - 毫秒级精度的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持! 上岸,阿里云!
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