shmat 是一个 UNIX 函数，它将与 shmid（另一个 Solaris 函数）所标识的共享内存相关的共享内存段附加到调用进程的数据段上。
shmat is a UNIX function that attaches the shared memory segment associated with the shared memory identified by shmid (another Solaris function) to the data segment of the calling process.
fenced UDF 和存储过程：如果数据库上运行着一个 fenced 函数或过程，那么数据库共享内存中有一个段要预留给 fenced 模式的通信。
Fenced UDFs and Stored Procedures: If a fenced function or procedure is run on the database, then one segment is used for fenced mode communication.
它的构造函数创建共享内存及其中的对象。
Its constructor creates the Shared memory and objects in it.
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