读者

代码说明：

读者-写者问题的读写操作限制（包括读者优先和写者优先） 写-写互斥：不能有两个写者同时进行写操作 读-写互斥：不能同时有一个线程在读，而另一个线程在写。 读-读允许：可以有一个或多个读者在读。-Readers- read and write operations to write the problem of constraints (including the readers of priority and writing preferred) Write- write mutually exclusive: You can not have two writers write the same time Read- Write mutually exclusive: You can not simultaneously reading a thread while another thread is writing. Reading- Reading allowed: You can have one or more readers to read.