GetOneSpan()

scl::span * Spices::CentralCache::GetOneSpan ( scl::span_list & list, size_t size )

staticprivate

Get a not empty span.

Parameters

[in,out]	list	span list.
[in]	size	aligned bytes.

Returns

Returns span.

Find span in cc.

Release mutex.

get pages count.

get a new span.

get start/end pointer.

split pages to blocks.

Get mutex.

Push to list.

Find span in cc.

Release mutex.

get pages count.

get a new span.

get start/end pointer.

split pages to blocks.

Get mutex.

Push to list.

Definition at line 48 of file CentralCache.cpp.

    {
        scl::span* it = list.Begin();
        while (it != list.End())
        {
            if (it->m_FreeList != nullptr)
            {
                return it;
            }
            else
            {
                it = it->m_Next;
            }
        }
 
        list.GetMutex().unlock();
 
        size_t k = MemoryPool::GetPages(size);
 
        scl::span* s   = PageCache::Get()->NewSpan(k);
        s->m_IsUse     = true;
        s->m_BlockSize = size;
 
        char* start = reinterpret_cast<char*>(         s->m_PageId << MemoryPool::PAGE_SHIFT );
        char* end   = reinterpret_cast<char*>(start + (s->m_NPages << MemoryPool::PAGE_SHIFT));
 
        s->m_FreeList = start;
 
        {
            void* tail = start;
            start += size;
 
            int i = 0;
            while (start + size <= end)
            {
                ++i;
                MemoryPool::PointerSpace(tail) = start;
                start += size;
                tail = MemoryPool::PointerSpace(tail);
            }
            MemoryPool::PointerSpace(tail) = nullptr;
        }
 
        list.GetMutex().lock();
 
        list.PushFront(s);
 
        return s;
    }

References scl::span_list::Begin(), scl::span_list::End(), scl::span::m_FreeList, scl::span::m_IsUse, scl::span::m_Next, Spices::MemoryPool::PointerSpace(), and scl::span_list::PushFront().