sem_lock_wait存在时间运算溢出问题

[xkf321]

clock_gettime(CLOCK_REALTIME, &ts);
uint64_t ns = ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec;
ns += ms * 1000 * 1000;
ts.tv_sec = ns / (1000 * 1000 * 1000);
ts.tv_nsec = ns % 1000 * 1000 * 1000;
ret = sem_timedwait(lock, &ts);

uint64_t ns = ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec;
运行平台为arm32，计算ns 时会使用uint32类型，导致运算出现溢出， ts.tv_sec前增加强制转换为 uint64_t 可以解决