1 /*
2 * Copyright (c) 2022 Jeppe Odgaard
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <zephyr/kernel.h>
8 #include <zephyr/sys/sys_heap.h>
9
10 #define HEAP_SIZE 256
11
12 K_HEAP_DEFINE(my_kernel_heap, HEAP_SIZE);
13
14 static char heap_mem[HEAP_SIZE];
15 static struct sys_heap heap;
16
17 static void print_sys_memory_stats(struct sys_heap *);
18 static void print_all_heaps(void);
19
main(void)20 int main(void)
21 {
22 void *p;
23
24 printk("System heap sample\n\n");
25
26 sys_heap_init(&heap, heap_mem, HEAP_SIZE);
27 print_sys_memory_stats(&heap);
28
29 p = sys_heap_alloc(&heap, 150);
30 print_sys_memory_stats(&heap);
31
32 p = sys_heap_realloc(&heap, p, 100);
33 print_sys_memory_stats(&heap);
34
35 sys_heap_free(&heap, p);
36 print_sys_memory_stats(&heap);
37
38 print_all_heaps();
39 return 0;
40 }
41
print_sys_memory_stats(struct sys_heap * hp)42 static void print_sys_memory_stats(struct sys_heap *hp)
43 {
44 struct sys_memory_stats stats;
45
46 sys_heap_runtime_stats_get(hp, &stats);
47
48 printk("allocated %zu, free %zu, max allocated %zu, heap size %u\n",
49 stats.allocated_bytes, stats.free_bytes,
50 stats.max_allocated_bytes, HEAP_SIZE);
51 }
52
print_all_heaps(void)53 static void print_all_heaps(void)
54 {
55 struct sys_heap **ha;
56 size_t i, n;
57
58 n = sys_heap_array_get(&ha);
59 printk("There are %zu heaps allocated:\n", n);
60
61 for (i = 0; i < n; i++) {
62 printk("\t%zu - address %p ", i, ha[i]);
63 print_sys_memory_stats(ha[i]);
64 }
65 }
66
