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amosk's questions

Martin Hope
amosk
Asked: 2017-01-14 13:51:12 +0800 CST
  • 5

我发现在最新的闰秒插入之后（2016-12-31 23:59:60），我们的 CentOS7 应用程序在工作之间有工作线程休眠 1 秒，开始立即唤醒休眠线程，而不是在一秒钟内。一般来说，所有睡眠都比预期的醒来时间早 1 秒。

最简单且有效的解决方案是重新启动盒子。但这在我们的情况下是不可取的。有没有办法在不重新启动的情况下解决这个问题？

PS。作为参考，这里有一个用 C++ 编写的简单程序，它重现了这个问题。

#include <boost/date_time.hpp>
#include <boost/thread.hpp>
#include <iostream>

using namespace std;


// this has to be run in a thread to be able to detect the issue
void check_thread()
{
    size_t expected_delay = 1000;
    cout << "Expected delay: " << expected_delay << " ms" << endl;
    boost::posix_time::ptime t1 = boost::posix_time::microsec_clock::universal_time();
    boost::this_thread::sleep(boost::posix_time::milliseconds(1000));
    boost::posix_time::ptime t2 = boost::posix_time::microsec_clock::universal_time();
    size_t actual_delay = (t2 - t1).total_milliseconds();
    cout << "Actual delay: " << actual_delay << " ms" << endl;
    if (abs(expected_delay - actual_delay) > 900) {
        cout << "Too big delay difference: " << (expected_delay - actual_delay) << endl;
        cout << "Possible leap second issue" << endl;
    }
    else {
        cout << "No issues found" << endl;
    }
}

int main()
{
    boost::thread_group g;
    g.create_thread(check_thread);
    g.join_all();
    return 0;
}

建造：

g++ sleep_test.cpp -Wl,-Bstatic -lboost_thread -lboost_system -lboost_date_time -Wl,-Bdynamic -rdynamic -pthread
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