September 2001
Intermediate to advanced
400 pages
11h 23m
English
Content preview from Palm OS Network ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 12. Optimizing Stream Sockets
We are just about done with stream sockets. We can make and accept connections and send and receive data. We know just about everything we need to know to write efficient, enjoyable TCP/IP network applications. There are just a few last details to cover; a few refinements to your understanding of stream sockets.
In this chapter, I discuss socket operating modes. The Palm OS
platform supports two socket operating modes: blocking and
nonblocking. Our sockets have all operated in blocking mode. In this
chapter, I discuss nonblocking mode. We explore the costs and
benefits of switching from blocking to nonblocking sockets. We use
nonblocking sockets to improve the FtpView user
experience.
Socket Operating Modes
A blocking socket waits, or blocks, for network operations to complete. Nonblocking sockets do not wait. If an operation blocks, nonblocking sockets immediately return an error indicating this.
For example, let’s look at the receive operation. If we attempt to receive data from a blocking socket and there is no data to receive, the socket waits until the data arrives. A nonblocking socket, on the other hand, returns immediately from the receive operation with an error indicating that the operation would block.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.