Implement memory decommit

src/main.c

@@ -162,6 +162,34 @@ static void arena_test_4(void)
 
     arena_free(&arena);
 }
+
+static void arena_test_decommit(void)
+{
+    TRACEF("\n");
+
+    U32 page_size = platform_page_size();
+    ArenaOptions arena_params = {};
+    U32 arena_size  = MB(1) + MemoryBlock_Header_Size;
+    U32 commit_size = KB(64);
+    arena_params.size = arena_size;
+    arena_params.commit_size = commit_size;
+    Arena arena;
+    arena_init(&arena, &arena_params);
+    void *ptr = arena_push(&arena, commit_size * 10, 8);
+    MemoryZero(ptr, commit_size * 10);
+    arena_reset(&arena);
+
+    void *pre_ptr = arena_push(&arena, 5, 4);
+
+    ATemp tmp = arena_temp_begin(&arena);
+    ptr = arena_push(&arena, commit_size * 2 + 13, 8);
+    MemoryZero(ptr, commit_size * 2 + 13);
+    arena_temp_end(&tmp);
+    MemoryZero(pre_ptr, 5);
+
+    arena_free(&arena);
+}
+
 void miniarena_test1(void)
 {
     #define  arena_size  4096
@@ -290,8 +318,10 @@ int main(int argc, char *argv[])
     // arena_test_2();
     // arena_test_3();
     // arena_test_4();
-//    miniarena_test1();
-    apool_test();
-    apool_test_autogrow();
+    arena_test_decommit();
+
+    // miniarena_test1();
+    // apool_test();
+    // apool_test_autogrow();
 }