Dynamic allocator: Dynamic allocator keeps the heap as a group of several size blocks; each block is an attached portion of virtual memory which is allocated or free. An allocated block has been clearly kept for use by the application. A free block is offered to be allocated. Two types of allocators: 1. Explicit allocators 2. Implicit allocators Explicit allocators: Explicit allocators need the application to explicitly free any allocated blocks. Implicit allocators: Implicit allocators is the method of automatically releasing vacant allocated blocks. This is also known as garbage collection. Explicit free list: In this method, a block contains one word header, payload and additional padding. The header encrypts the block size which contains header and padding; and also check the block is allocated or free. The heap can be organized doubly linked list by including predecessor and successor pointer in each free block. This method reduces the allocation time when compared to implicit free list. If the arrangement is single-word, the block size is constantly a multiple of “4” and the low-order bits of the block size are always zero. If the arrangement is double-word, the block size is constantly a multiple of “8” and the low-order bits of the block size are always zero.

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Chapter 9, Problem 9.16HW

Program Plan Intro

Dynamic allocator:

Dynamic allocator keeps the heap as a group of several size blocks; each block is an attached portion of virtual memory which is allocated or free.

An allocated block has been clearly kept for use by the application.

A free block is offered to be allocated.

Two types of allocators:

1. Explicit allocators

2. Implicit allocators

Explicit allocators:

Explicit allocators need the application to explicitly free any allocated blocks.

Implicit allocators:

Implicit allocators is the method of automatically releasing vacant allocated blocks. This is also known as garbage collection.

Explicit free list:

In this method, a block contains one word header, payload and additional padding. The header encrypts the block size which contains header and padding; and also check the block is allocated or free.

The heap can be organized doubly linked list by including predecessor and successor pointer in each free block.

This method reduces the allocation time when compared to implicit free list.

If the arrangement is single-word, the block size is constantly a multiple of “4” and the low-order bits of the block size are always zero.

If the arrangement is double-word, the block size is constantly a multiple of “8” and the low-order bits of the block size are always zero.

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