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Ruby Plays Well With Others - Part 2

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17 Ruby C Extensions Copyright © 2007 by Object Computing, Inc. (OCI) . All rights reserved. 33 More Information • READ ME. EX T -in Ruby distribution • Programming Ruby, 2nd Edition ...

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1 Copyright © 2007 by Object Computing, Inc. (OCI) . All rights reserved. Ruby Plays Well With Others - Part 2 Ruby C Extensions Mark Volkmann mark@ociweb. com Ruby C Extensions Copyright © 2007 by Object Computing, Inc. (OCI) . All rights reserved. 2 Overview • Reasons to -invoke C from Ruby •use C libraries from Ruby applications •performance -invoke Ruby from C •use Ruby libraries from C applications • Ruby can call C code in these ways -interpreter API •since the Ruby interpreter is implemented in C, its API can be used -dont need a special API added for interacting with C like Javas JNI -Ruby Inline •supports mixing C code into Ruby code -SWIG •generates wrapper code for C functions in many languages including Ruby -well focus on the interpreter API here 2 Ruby C Extensions Copyright © 2007 by Object Computing, Inc. (OCI) . All rights reserved. 3 mkmf (make makefile) Ruby Module • Generates platform-specific Makefiles for compiling C extensions to Ruby • Simple usage -create a file containing the following, named extconf. rb by convention require mkmf extension_name = name dir_con fig (extension_name) create_makefile (extension_name) -use by running ruby extconf. rb make -generates • . so under UNIX/Linux • . so under Windows when building with Cygwin • . bundle under Mac OS X mkmf. rb is in $RUBY_HOME/lib Can add conditional processing using these Ruby functions: • check_sizeof • disable_config • enable_config • find_executable • find_header • find_library • have_func • have_header • have_library • have_macro • have_struct_member • have_type • have_var • pkg_config • with_config specifies nonstandard directories where include files and libraries may be found Ruby C Extensions Copyright © 2007 by Object Computing, Inc. (OCI) . All rights reserved. 4 Ruby Constants and Types in C • Boolea ...

Source: ociweb.com

 

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