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Proper memory commitment

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This commit is contained in:
Nils O. Selåsdal
2026-06-09 01:06:48 +02:00
parent 6b9b058859
commit 1477f5b396
6 changed files with 123 additions and 78 deletions
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src/main.c
+23 -11
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@@ -5,6 +5,7 @@
void arena_dump(const Arena *arena)
{
return;
MemoryBlock *block = arena->current;
puts("@@@@@@@@@@");
while (block) {
@@ -21,7 +22,10 @@ void arena_dump(const Arena *arena)
static void arena_test_1(void)
{
ArenaParams arena_params = {};
arena_params.size = 1024+MemoryBlock_Header_Size;
U32 arena_size = MB(1) + MemoryBlock_Header_Size;
U32 commit_size = KB(8);
arena_params.size = arena_size;
arena_params.commit_size = commit_size;
Arena arena;
arena_init(&arena, &arena_params);
arena_dump(&arena);
@@ -43,22 +47,28 @@ static void arena_test_1(void)
static void arena_test_2(void)
{
ArenaParams arena_params = {};
arena_params.size = 1024+MemoryBlock_Header_Size;
U32 arena_size = MB(1) + MemoryBlock_Header_Size;
U32 commit_size = KB(16);
U32 push_size = KB(32);
arena_params.size = arena_size;
arena_params.commit_size = commit_size;
Arena arena;
arena_init(&arena, &arena_params);
void *ptr;
ptr = arena_push(&arena, 1024, 8);
MemoryZero(ptr, 1024);
ptr = arena_push(&arena, push_size, 8);
MemoryZero(ptr, push_size);
printf("Allocated ptr %p\n", ptr);
arena_dump(&arena);
ArenaCheckPoint checkpoint = arena_temp_begin(&arena);
ptr = arena_push(&arena, 4096, 8);
MemoryZero(ptr, 4096);
ptr = arena_push(&arena, MB(2), 8);
MemoryZero(ptr, MB(2));
ptr = arena_push(&arena, 4096, 8);
MemoryZero(ptr, 4096);
ptr = arena_push(&arena, commit_size * 3, 8);
MemoryZero(ptr, commit_size * 3 );
ptr = arena_push(&arena, commit_size , 8);
MemoryZero(ptr, commit_size );
ArenaCheckPoint checkpoint2 = arena_temp_begin(&arena);
ptr = arena_push(&arena, 64, 8);
@@ -69,9 +79,11 @@ static void arena_test_2(void)
arena_temp_end(&checkpoint);
arena_pop_to(&arena, 1088);
arena_dump(&arena);
ptr = arena_push(&arena, 1, 1);
ptr = arena_push(&arena, 1, KB(16));
((U8*)ptr)[0] = 0x37;
ptr = arena_push(&arena, 1, 1);
ptr = arena_push(&arena, 1, KB(16));
((U8*)ptr)[0] = 0x73;
ptr = arena_push(&arena, 1, KB(4));
((U8*)ptr)[0] = 0x73;
arena_pop_to(&arena, 1089);
arena_dump(&arena);
@@ -82,6 +94,6 @@ static void arena_test_2(void)
int main(int argc, char *argv[])
{
arena_test_1();
//arena_test_1();
arena_test_2();
}