DosMemAvail

This call returns the size of the largest block of free memory.

Syntax

DosMemAvail (MemAvailSize)

Parameters

MemAvailSize (PULONG) - output

Address of the size of the largest free block of memory.

Return Code

rc (USHORT) - return

Return code description is:

• 0 NO_ERROR

Remarks

DosMemAvail allows an application to determine how heavily used system memory is at a particular time. The returned value is a "snapshot" that may be valid only at the moment this function is issued and can be expected to change at any time due to system activity.

This call can be used as an indicator for memory availability before a call to DosAllocHuge is made.

Example Code

C Binding

#define INCL_DOSMEMMGR

USHORT  rc = DosMemAvail(MemAvailSize);

PULONG           MemAvailSize;  /* Size available (returned) */

USHORT           rc;            /* return code */

MASM Binding

EXTRN  DosMemAvail:FAR
INCL_DOSMEMMGR      EQU 1

PUSH@  DWORD   MemAvailSize  ;Size available (returned)
CALL   DosMemAvail

Returns WORD

Related Functions

• DosAllocHuge