This can be used to combine the synchronization point for multiple file handles into a single object.

对于多个文件句柄来说，就可以把这些多个文件句柄合并成一个单独的对象，这个可以被用来结合同步点？

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On POSIX-compliant systems, file handles are process and not thread attributes. Here are a few guidelines for using file locking.

在与POSIX兼容的系统上，文件句柄是进程属性，而不是线程属性。

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Facilities include open file handles (file descriptors), Shared memory, process synchronization primitives, and current directory.

这些设施包括打开文件句柄(文件描述符)、共享内存、进程同步原语和当前目录。

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