JCL Help:RoundToAllocGranularityPtr

 JCL Help: RoundToAllocGranularityPtr Function

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Summary

Rounds an address to an allocation boundary.

Pascal

 procedure RoundToAllocGranularityPtr(var Value: Pointer; Up: Boolean);

Parameters

Parameters	Description
var Value: Pointer	The address to adjust.
Up: Boolean	If True the function rounds the address up to the next multiple of the allocation granularity, if False it rounds the address down to the previous multiple of the allocation granularity.

Description

Some Win32 API routines that take pointer parameters require that the specified address is a multiple of the allocation granularity. On current Intel platforms (x86) this is 64K. RoundToAllocGranularityPtr rounds the given 32 bit address to a system defined allocation granularity boundary. You can have the function round upwards or downwards by specifying True or False for the Up parameter respectively. This function also exists for 64 bit pointers.

About

Unit

JclSysInfo

Donator

Wim De Cleen

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