Function timespec_diff_us

test/bthread_timer_thread_unittest.cpp:27–30

namespace {

long timespec_diff_us(const timespec& ts1, const timespec& ts2) {
    return (ts1.tv_sec - ts2.tv_sec) * 1000000L +
        (ts1.tv_nsec - ts2.tv_nsec) / 1000;
}

// A simple class, could keep track of the time when it is invoked.
class TimeKeeper {