dmmlib/examples/test_for_memory_space_aware.c

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <dmmlib/initialize_allocator.h>
#include <dmmlib/dmmlib.h>

#define ALLOCATOR_SIZE 16*1024*sizeof(char)

int main(void) {

    allocator_t systemallocator;
    void *block_from_malloc;
    void *p1, *p2, *p3;

    block_from_malloc = malloc(ALLOCATOR_SIZE);    
    initialize_allocator(&systemallocator, block_from_malloc, ALLOCATOR_SIZE);

    /* Testing a best-fit, w/o fixed lists allocator */

    /* Test 1: Check if the block is taken back */
    p1 = custom_ahmalloc(&systemallocator, &systemallocator.heaps[0], (size_t) 1024);
    custom_ahfree(&systemallocator, &systemallocator.heaps[0], p1);
    /* Check if the block is taken back */
    p2 = custom_ahmalloc(&systemallocator, &systemallocator.heaps[0], (size_t) 1000);
    assert( p2 == p1 );
    custom_ahfree(&systemallocator, &systemallocator.heaps[0], p2);

    /* Test 2: Check if best fit on LIFO works */
    /* Allocate two memory blocks of 1024 and 432 bytes */
    p1 = custom_ahmalloc(&systemallocator, &systemallocator.heaps[0], (size_t) 1024);
    p2 = custom_ahmalloc(&systemallocator, &systemallocator.heaps[0], (size_t) 432);
    /* Make them free */
    custom_ahfree(&systemallocator, &systemallocator.heaps[0], p2);
    custom_ahfree(&systemallocator, &systemallocator.heaps[0], p1);
    /* Pray that the 423-byte one is going to be used by a 300-byte malloc */
    p3 = custom_ahmalloc(&systemallocator, &systemallocator.heaps[0], (size_t) 300);
    assert( p3 == p2 );
    custom_ahfree(&systemallocator, &systemallocator.heaps[0], p3);

    free(block_from_malloc);

    return 0;
}