internal unsafe void VisitSpecialData(DirectReferenceVisitor visitor)
{
HandlePage *limit = null;
HandlePage *began;
do
{
// Repeat this loop as long as new pages appear.
// REVIEW: I'm not sure this is needed, the write barrier might
// take care of this for us.
began = pages;
for (HandlePage *page = began; page != limit; page = page->next)
{
// Get the bounds.
HandleEntry *entry = ((HandleEntry *)(page + 1));
HandleEntry *elimit = entry + handlesPerPage;
for (; entry < elimit; entry++)
{
entry->Visit(visitor);
}
}
limit = pages;
} while (pages != began);
}
internal unsafe UIntPtr FreeAllPages()
{
// We assume that external code has insured thread safety.
freeList = null;
for (HandlePage *next; pages != null; pages = next)
{
next = pages->next;
MemoryManager.KernelFree((UIntPtr)pages, 1, process);
}
return((UIntPtr)pageCount * MemoryManager.PageSize);
}
internal unsafe HandleEntry *AllocateEntry()
{
HandleEntry *entry = AllocateExisting();
if (entry != null)
{
return(entry);
}
#if SINGULARITY_KERNEL
Kernel.Waypoint(830);
#endif // SINGULARITY_KERNEL
// Need to allocate a new page.
HandlePage *page
= (HandlePage *)MemoryManager.KernelAllocate(
1, process, 0, PageType.Shared);
#if SINGULARITY_KERNEL
Kernel.Waypoint(831);
#endif // SINGULARITY_KERNEL
if (page == null)
{
return(null);
}
// Get the bounds.
HandleEntry *beg = ((HandleEntry *)(page + 1));
HandleEntry *end = beg + handlesPerPage - 1;
// Save off the first entry to return.
entry = beg++;
entry->Set(null);
entry->next = null;
// Initialize the free list in the rest of the entries.
for (HandleEntry *step = beg; step < end; step++)
{
step->Set(null);
step->next = step + 1;
}
end->Set(null);
end->next = null;
// Initialize the page header and insert into the page list.
page->SetTable(this);
page->next = null;
HandlePage *last;
do
{
last = pages;
page->next = last;
// Interlocked.CompareExchange only updates pages if it hasn't
// changed within this loop.
} while (last != Interlocked.CompareExchange(ref pages, page, last));
// Then insert into the free list.
HandleEntry *next;
do
{
next = freeList;
end->next = next;
// Interlocked.CompareExchange only updates freeList if it hasn't
// changed with this loop.
} while (next != Interlocked.CompareExchange(ref freeList, beg, next));
Interlocked.Increment(ref pageCount);
return(entry);
}
internal unsafe HandleTable(Process process)
{
pages = null;
freeList = null;
}
internal static unsafe HandleTable FindOwner(HandleEntry *entry)
{
HandlePage *page = (HandlePage *)MemoryManager.PageAlign((UIntPtr)entry);
return(page->GetTable());
}