private void InternalEventPagesReleased(PagesInUse pages)
{
// if these previously in use pages are contiguous with a free block of pages, add them to that block.
bool block_found = false;
for (int i = 0; i < m_EmptyPages.Count; i++)
{
if (m_EmptyPages[i].FirstPage == pages.FollowingPage)
{
m_EmptyPages[i].FirstPage = pages.FirstPage;
m_EmptyPages[i].PageLength += pages.PageLength;
m_InUsePages.Remove(pages);
block_found = true;
break;
}
if (m_EmptyPages[i].FollowingPage == pages.FirstPage)
{
m_EmptyPages[i].PageLength += pages.PageLength;
m_InUsePages.Remove(pages);
block_found = true;
break;
}
}
// otherwise add a new free block of pages.
if (!block_found)
{
m_EmptyPages.Add(new PagesAvailable(pages.FirstPage, pages.PageLength));
m_InUsePages.Remove(pages);
}
if (m_ContiguousMonitorCount++ >= 32)
MergeContiguousEmptyBlocks();
}
public Bookmark RequestContiguousFreePages(int count)
{
for (int i = 0; i < m_EmptyPages.Count; i++)
{
if (m_EmptyPages[i].PageLength >= count)
{
PagesAvailable available = m_EmptyPages[i];
PagesInUse new_pages = new PagesInUse(available.FirstPage, m_Offset, count, InternalEventPagesReleased);
available.FirstPage += count;
available.PageLength -= count;
m_InUsePages.Add(new_pages);
return new_pages.GetBookmark();
}
}
Logging.Fatal(string.Format("RequestContiguousFreePages failed with page count of {0}.", count));
return null;
}
