"' OpenMP "'( "'Open Multi-Processing "') is an application programming interface ( API ) that supports multi-platform library routines, and environment variables that influence run-time behavior.
32.
These functions may be implemented as library routines in terms of, as is done in Linux, or in terms of for better performance, as is done in Solaris, but the POSIX specification notes that they were " designed as real-time systems.
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While there had previously been processors that achieved significant amounts of ILP, they had all relied upon code laboriously hand-parallelized by the user, or upon library routines, and thus were not general-purpose computers and did not fit the VLIW paradigm.
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Dynamic linking or late binding is linking performed while a program is being loaded ( load time ) or executed ( linker when the executable file is created; it only records what library routines the program needs and the index names or numbers of the routines in the library.
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Certain code-development frameworks can leverage certain forms of logic that are represented in the database's schema ( such as referential integrity constraints ), so that such issues are handled in a generic and standard fashion through library routines rather than ad hoc code written on a case-by-case basis.
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The programmer would call the library routine using the LIBF pseudo-operation, which assembled not a direct BSI to the routine but a one-word indexed branch instruction ( BSI 3 " disp " ) whose displacement (-128,-125, and so on ) identified the start of the routine's transfer vector.
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Library routines were addressed through index register XR3 . ( Fortran programs would use index register XR1 for the addresses of parameters and the return address, but register XR2 was unused . ) XR3 would be pointed to a sequence of three-word "'transfer vectors "'such that the first entry would be-128 words from XR3's value.
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It has the usual C language constructs for iteration and condition testing, but they do not appear to work from the command line . ( The examples on pg 141 do not work . ) Ch claims ( pg 66 ) to support wildcarding ( it calls it " filename substitution " ) but actually, it depends ( at least on Windows ) on the child doing the wildcarding when an external command is invoked for everything except the tilde ( home directory ) . ( You can discover the behavior by typing echo * . ) That's conventional on Windows ( developers routinely link in a library routine setargv . obj to do the wildcarding prior to entry to main ( ) ) but it means there's no support for ranges ( e . g ., hello . [ ch ] ) or multi-level wildcarding ( e . g ., * / * . c ) supported by a Unix shell ( like Bash or tcsh, even on Windows . ) History and filename and command completion appears to be done with Readline.
