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As you can see, they are fairly trivial. The rotate_rgb() function directly calls the do_pixels() function, specifying rotate_rgb_pixel() as the callback with no user data. The work performed in rotate_rgb_pixel() is also quite minimal. It calculates the channel one higher than the current channel, and returns the value of the current byte in that channel. To make sure that the resulting channel number is valid (0, 1 or 2), the result is taken modulus three. If the current channel is the alpha channel (number 3), it is used directly. One notable fact is that this function already takes into account that there might be four channels in an image, in which case it leaves the alpha channel unchanged. If you want to use this code, or something similar to it, it would be wise to adopt the same strategy when you write your callbacks. It will save you a lot of time when you change that NCHANNELS macro at the top of the C code, and the magick attribute for the source image to RGBA. All of the glue work that we d normally have to provide with XS or SWIG has been taken care of by the Inline module. The C code that is included in the presented program is almost entirely standard C, apart from a few macros which are part of the Perl API.

If you are mixing automatic workarea sizing with shared servers (once known as multithreaded servers MTS), then many of the details about the pga_aggregate_target do not apply until you get to 10g. Historically, the memory for hash joins had to be in the UGA, which was kept in the SGA when you were running shared server. In 9i, this is still true, and the hash_area_size still dictates the memory allocated by shared servers, even though the allocation is then monitored by the newer workarea code. Strangely, the optimizer does not know whether a piece of SQL is coming from a shared server or a dedicated server, so the calculations are always based on the pga_aggregate_target approach even when the available memory is limited by the hash_area_size. In 10g, the shared server hash area has managed to migrate out of the UGA into the PGA, and so its size is dictated by the pga_aggregate_target. Note: in earlier versions of Oracle, you were advised to avoid using shared servers for sessions doing long-running hash or sort operations perhaps this warning is no long relevant in 10g.

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Guy Steele wing I also got to know some of the people in the AI Lab So by the time I applied to MIT for graduate school it was pretty easy to get accepted because they already knew me and what I was doing Seibel: Did you get your undergrad degree in computer science Steele: Yeah I set out to be a pure math major and arranged my courses appropriately and then discovered that I had no intuition whatsoever for infinite dimensional Banach spaces That s what did me in Fortunately, just out of interest, I had taken enough computer courses on the side that I was well-positioned to make the switch in major To be precise, what I switched to was an applied math major Computer science was part of applied math, and applied math was part of the engineering department at Harvard.

The four scripts basically do the same thing. Where I have enabled CPU costing, I have used the following set of figures to emulate the arithmetic that the traditional I/O costing would do:

Even Inline can t do all the work for you, and if you get serious about writing plug-in C code for Perl, you will have to read up on the Perl API and understand how Perl s internals work. The documentation contained in the perlguts, perlxs, and perlxstut manual pages should move you a long way in the right direction. The new and upcoming book about using Perl and C [33] promises to be a valuable source of information for programmers interested in this area.

Seibel: At Harvard what kinds of machines were you dealing with Steele: DEC PDP-10s There was a PDP-10 on campus, but I think that was mostly used for the graduate work Undergraduates had access to teletype terminals to a commercial system that Harvard was renting or leasing or something Seibel: Is there anything you would do differently about how you went about learning to program Is there anything you wish you had done earlier Steele: It s not as if I set out with a particular goal in mind I have no regrets about the particular path I took Looking back I think I was the fortunate beneficiary of a number of interesting coincidences or blessings This experience of being, in effect, both at MIT and Harvard at the same time I now realize was a very unusual experience.

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