By Douglas C. Schmidt, Stephen D. Huston

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Extra info for C++ Network Programming Volume II - Systematic Reuse with ACE and Frameworks

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One-shot versus Standing Servers 36 37 A one-shot server doesn't remain in system memory when it's idle. Therefore, this design strategy can consume fewer system resources, such as virtual memory and process table slots. This advantage is clearly more pronounced for services that are seldom used. Standing servers continue to run beyond the lifetime of any particular service request or session they process. Standing servers are often initiated at boot time or by a superserver after the first client request.

When ACE_Get_Opt finds a long option with a corresponding short option, it returns the short option making it much easier for the caller to handle it in a switch statement. Many examples in the book illustrate the use of both long and short options. • Since short options are defined as integers, long options that wouldn't normally have a meaningful short option equivalent can designate nonalphanumeric values for the corresponding short option. These nonalphanumeric cannot appear in the argument list or in the optstring parameter, but can be returned and processed efficiently in a switch statement.

Unlike INETD, however, LISTEN supports standing servers by passing initialized file descriptors via STREAMS pipes from the LISTEN process to a previously registered standing server. • Unlike INETD and LISTEN, the Windows SCM is not a port monitor since it doesn't provide built-in support for listening to a set of I/O ports and dispatching server processes on demand when client requests arrive. , pause, resume, or terminate) administrator-installed services (such as FTP and TELNET) that typically run as separate threads within either a single-service or a multiservice daemon process.

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