December 2000
Intermediate to advanced
784 pages
20h 54m
English
Content preview from Network Programming with Perl
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Summary
Nonblocking I/O is a double-edged sword. On the one hand, it makes it possible to write servers that can process multiple simultaneous connections without spawning new processes or threads. Compared to the multiprocessing solutions, nonblocking I/O has a slight performance edge and consumes fewer system resources. Nonblocking I/O is also the only viable solution for creating multiconnection servers that will run on platforms that do not support the fork() or thread APIs, such as the Macintosh.
On the other hand, nonblocking I/O significantly increases the complexity of networking software. Most of this complexity comes from the overhead of keeping track of partial writes and handling EWOULDBLOCK errors from syswrite() and sysread()
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