Call blocks until at least one of the registered sockets is ready to perform at least one of the registered operations without blocking 调用将一直阻塞，直至至少有一个注册的套接字准备好执行至少一个无阻塞的已注册的操作。
2.
Co - work with hardware engineer and customer to provide well - defined api to encapsulate the hardware registers operation to a hardware abstraction layer 通过和硬件工程师及客户紧密合作，提供定义良好的api来封装寄存器操作，实现对硬件平台的抽象。
3.
The provided service owner fills in specific values in the template and returns it in the service level definition format to the service domain in a register operation call to the service domain 服务所有者负责填写模板中特定的内容，然后通过对服务域的注册操作调用将其（以服务级别定义的格式）返回给服务域。
