使用相同的线程来锁定和解锁文件。

Use the same thread to lock and unlock a file.

youdao

如果使用scoped_lock，就不需要显式地锁定或解锁文件；锁定发生在构造器内，每当您退出该范围，就会自动发生解锁。

Using scoped_lock, you don't need to explicitly lock or unlock the file; the locking occurs inside the constructor, and the unlocking happens automatically whenever you exit the scope.

youdao

在解锁文件之前，通过调用 C 的 flush 库例程或 flush 方法（如果喜欢使用 C++ fstream 的话），刷新写入者进程中的数据。

Flush data in writer processes before unlocking a file by either calling C's flush library routine or the flush method (if you prefer a C++ fstream).

youdao