(j3.2006) (SC22WG5.4113) Standard intrinsics and coarrays (NOT random numbers)
Thu Oct 22 09:18:39 EDT 2009
N.M. Maclaren wrote:
> Here is an alternative, that I think takes on board Bill's and Van's
> comments. It does not include the random number issues.
> In 13.5, Standard generic intrinsic procedures, after Table 13.1, add
> the new paragraphs:
> The effects of calling COMMAND_ARGUMENT_COUNT, EXECUTE_COMMAND_LINE,
> GET_COMMAND, GET_COMMAND_ARGUMENT, GET_ENVIRONMENT_VARIABLE on any
> image other than image 1 are processor dependent.
I'd add "or" before "GET_ENVIRONMENT_VARIABLE" here and in the Annex A
edit. Otherwise, this looks fine.
> [ I dithered over "effects of calling" versus "results returned from",
> but decided that the former was better because one plausible
> implementation of these on other images is by a message and response
> handshake to image 1. ]
> < Random numbers will be mentioned separately >
> It is processor dependent whether the results returned from
> CPU_TIME, DATE_AND_TIME and SYSTEM_CLOCK are dependent on which
> image calls them.
> NOTE 13.x
> This means that it is unspecified whether images use synchronized
> clocks, whether CPU_TIME returns a per-image or per-program value,
> whether all images run in the same time zone and whether the count
> rate and maximum in SYSTEM_CLOCK are the same for all images.
> The use of all other standard intrinsic procedures in unordered
> segments is subject only to their argument use following the rules
> in 8.5.2.
> In A2, Processor Dependencies, after "how the sequences of atomic
> actions in unordered segments interleave (13.1)", add the new bullet
> * The effects of calling COMMAND_ARGUMENT_COUNT,
> EXECUTE_COMMAND_LINE, GET_COMMAND, GET_COMMAND_ARGUMENT,
> GET_ENVIRONMENT_VARIABLE on any image other than image 1 (13.5);
> * whether the results returned from CPU_TIME, DATE_AND_TIME and
> SYSTEM_CLOCK are dependent on which image calls them (13.5);
> Nick Maclaren.
> J3 mailing list
> J3 at j3-fortran.org
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