oldsys_morecore.c File Reference

morecore() is a sbrk() equivalent. More...

Functions
Header *	morecore (unsigned nu)
	sbrk() equivalent. More...
void	lesscore (void)
	sbrk() garbage collector. More...

Detailed Description

morecore() is a sbrk() equivalent.

Function Documentation

void lesscore

(

void

)

sbrk() garbage collector.

Tries to free up pages at the end of the segment, so to shorten the segment and return memory to the operating system.

Header* morecore

(

unsigned

nu

)

sbrk() equivalent.

This function tries to allocate at least the amount given by 'nu' in sizeof(::Header) byte units. In some cases, it will allocate less, if no more memory was available. In any case, It returns a pointer to the freelist header of the memory region. NULL is returned when out of memory.

Parameters

nu	Number of memory units (1 unit == sizeof(::Header) bytes)

Returns

Pointer to freelist header of new memory region or NULL on out of memory.