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来自「快速开发」· 代码 · 共 43 行

This directory contains extensions to the core State Threads Library
that were contributed by users.  All files hereunder are not part of the
State Threads Library itself.  They are provided as-is, without warranty
or support, and under whatever license terms their authors provided.  To
contribute your own extensions, just mail them to the project
administrators or to one of the project's mailing lists; see
state-threads.sourceforge.net.  Please indicate the license terms under
which the project may distribute your contribution.

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stx_fileio
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Contributed by Jeff <[e-mail]>, 4 Nov 2002.

Provides non-blocking random access file reading capability for
programs using the State Threads library.  There is one public function:

ssize_t stx_file_read(st_netfd_t fd, off_t offset,
                      void *buf, size_t nbytes, st_utime_t timeout);

The implementation is not optimal in that the data is copied at least once
more than should be necessary.  Its usefulness is limited to cases where
random access to a file is required and where starvation of other threads
is unacceptable.

The particular application which motivated this implementation was a UDP
file transfer protocol.  Because the OS does very little buffering of UDP
traffic it is important that UDP transmission threads are not starved for
periods of time which are long relative to the interval required to
maintain a steady send rate.

Licensed under the same dual MPL/GPL as core State Threads.

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stx_dns
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Documentation coming.

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