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PageAllocatorEntryCount

PageAllocatorEntryCount

Description

Live mapped-region count. The number of PageEntry descriptors currently tracking an OS mapping handed out by this allocator and not yet freed. Retained (user-freed but not yet returned to the OS) regions live in free_entries[] and are NOT counted here. Useful for sizing decisions and for tests that need to observe alloc / free behaviour.

Usage example (Cross-references)

Usage examples (Cross-references) 
        size          page       = PageAllocatorPageSize(&alloc);
    
        if (PageAllocatorEntryCount(&alloc) != 0) {
            WriteFmt("init EntryCount != 0\n");
            ok = false;
            ok = false;
        }
        if (PageAllocatorEntryCount(&alloc) != 2) {
            WriteFmt("after 2 allocs EntryCount={} want 2\n", (u64)PageAllocatorEntryCount(&alloc));
            ok = false;
        }
        if (PageAllocatorEntryCount(&alloc) != 2) {
            WriteFmt("after 2 allocs EntryCount={} want 2\n", (u64)PageAllocatorEntryCount(&alloc));
            ok = false;
        }
        }
        // EntryCount drops to 1 (p1 moved to free_entries[]).
        if (PageAllocatorEntryCount(&alloc) != 1) {
            WriteFmt("after free p1 EntryCount={} want 1\n", (u64)PageAllocatorEntryCount(&alloc));
            ok = false;
        // EntryCount drops to 1 (p1 moved to free_entries[]).
        if (PageAllocatorEntryCount(&alloc) != 1) {
            WriteFmt("after free p1 EntryCount={} want 1\n", (u64)PageAllocatorEntryCount(&alloc));
            ok = false;
        }
            AllocatorFree(&alloc, p2);
        }
        if (PageAllocatorEntryCount(&alloc) != 0) {
            WriteFmt("after free p2 EntryCount={} want 0\n", (u64)PageAllocatorEntryCount(&alloc));
            ok = false;
        }
        if (PageAllocatorEntryCount(&alloc) != 0) {
            WriteFmt("after free p2 EntryCount={} want 0\n", (u64)PageAllocatorEntryCount(&alloc));
            ok = false;
        }
        PageAllocatorDeinit(&alloc);
        // Post-deinit the struct is zeroed: both accessors return 0.
        if (PageAllocatorEntryCount(&alloc) != 0) {
            WriteFmt("post-deinit EntryCount != 0\n");
            ok = false;
Last updated on
PageAllocatorDeinitPageAllocatorInit