vampyr
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Feb 21, 2008, 5:31 AM
Post #1 of 1
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Perl over C with SWIG - memory allocation question
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Hi everyone,
I'm currently writing an object-oriented wrapper over libhdfs, the C API for accessing the Hadoop filesystem (http://hadoop.apache.org/core/). I'll hopefully have it up on CPAN in a week or so.
My problem right now is memory allocation. Some functions in the C API expect a pre-allocated buffer, particularly the file read & write functions. Of course the wrapper will hide this requirement but I'm looking for an elegant solution. Right now, exemplifying with a call to get the current working directory, I'm doing something along these lines:
$self->{working_directory} = ' ' x $self->{buffer_size}; # Poor man's memory allocation
HDFS::hdfsGetWorkingDirectory( $self->{_fs}, $self->{working_directory}, $self->{buffer_size} );
This is also the way I plan to implement buffered reading for text files for instance. The problem disappears when doing writes or when reading a predetermined number of bytes.
Any ideas on an elegant solution for this problem or this a hack I'll have to live with?
(This post was edited by vampyr on Feb 21, 2008, 5:51 AM)
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