MPE/iX Intrinsics Reference Manual > Chapter 4 Command Definitions (ABORTSESS - FCLOSE)

DLSIZE

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	Edition 7 E0701
	Edition 7 E0300 ♥
	Edition 6 E0195

NM and CM callable.

Causes the area between DL and DB in the compatibility mode (CM) stack to be expanded or contracted within the CM stack segment.

Syntax


  I16                 I16V
  dldbsize := DLSIZE (size);

Functional Return

dldbsize

16-bit signed integer (assigned functional return)

Returns the granted number of half words for the DL-to-DB area. This value is negative, unless error condition CCL (1) is returned; a positive value is possible.

Parameters

size

16-bit signed integer by value (required)

Passes the desired number of half words for the DL-to-DB area, represented by a negative value. A size of 0 is permitted and resets the DL-to-DB area of the CM stack to the original value assigned when the process was created (initial DL). The size granted is the absolute value of size, rounded up so that the distance between the beginning of the segment and DB is a multiple of 128 half words.

Operation Notes

If expanding, all information in the area between DL and DB is saved. If contracting, all information in the area between DL and DB is lost.

If the DL area has been expanded, it can be contracted by calling DLSIZE with a size parameter requesting a smaller DL-to-DB area.

When called from programs running in NM the DLSIZE intrinsic affects the CM stack only; programmatic expansion and contraction in NM is not necessary.

CAUTION: Because of differences between DB-relative addressing (used in compatibility mode) and virtual addressing (used in native mode), calls to the DLSIZE intrinsic in mixed mode programming may cause stack corruption.

Hewlett-Packard does not recommend using the DLSIZE intrinsic in programs that move between Native mode and compatibility mode.

Condition Codes

CCE (2): Request granted. The value returned is >= the value requested.
CCG (0): Request denied. The requested size exceeded the maximum limit allowed. The maximum limit allowable is granted, and its size is returned.
CCL (1): Request denied. An illegal size parameter was specified, the size requested is less than the initial DL size, or the size parameter was a positive integer. The original area size, assigned when the CM stack segment was created, is granted.

Related Information

Manual: Introduction to MPE XL for MPE V Programmers

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