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Disk Resident Arrays Implementation Notes
Assumptions:
. ANSI C compiler is not required;
. interface to C programs is minimal (most users program in Fortran)
. low level I/O operations defined in ELIO library
. upper layer knows if they are called collectively or not
C Interface:
. C programs must use Integer and DoublePrecision data types,
defined in "global.h" (GA package) for both the GA and DRA, and include
file "dra.h";
. all arguments passed by address;
. names of DRA operations have capitalized DRA prefix i.e., C version of
Fortran dra_init is DRA_init. Note that the names are converted by cpp as
specified in "dra.h" so that in most cases, C and Fortran programs call
the same function. Internal convention is that there is a separate
Fortran wrapper to a DRA operation iff it has a character string
argument(s).
Implementation Status:
. prototyping used for DRA functions if ANSI C compiler available
. indexing arguments are currently implemented as integers
. reshaping and transposing in dra_[write,read]_section not implemented yet
Problems to Resolve:
. do we need explicit dra_flush or we should handle it implicitly after
each write when file is create in 'read+write' in mode ?
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