Exemplo n.º 1
0
void* FixedAllocator::Allocate()
{
    if (allocChunk_ == 0 || allocChunk_->blocksAvailable_ == 0)
    {
        Chunks::iterator i = chunks_.begin();
        for (;; ++i)
        {
            if (i == chunks_.end())
            {
                // Initialize
                chunks_.reserve(chunks_.size() + 1);
                Chunk newChunk;
                newChunk.Init(blockSize_, numBlocks_);
                chunks_.push_back(newChunk);
                allocChunk_ = &chunks_.back();
                deallocChunk_ = &chunks_.front();
                break;
            }
            if (i->blocksAvailable_ > 0)
            {
                allocChunk_ = &*i;
                break;
            }
        }
    }
    assert(allocChunk_ != 0);
    assert(allocChunk_->blocksAvailable_ > 0);
    
    return allocChunk_->Allocate(blockSize_);
}
Exemplo n.º 2
0
bool FixedAllocator::MakeNewChunk( void )
{
    bool allocated = false;
    try
    {
        std::size_t size = chunks_.size();
        // Calling chunks_.reserve *before* creating and initializing the new
        // Chunk means that nothing is leaked by this function in case an
        // exception is thrown from reserve.
        if ( chunks_.capacity() == size )
        {
            if ( 0 == size ) size = 4;
            chunks_.reserve( size * 2 );
        }
        Chunk newChunk;
        allocated = newChunk.Init( blockSize_, numBlocks_ );
        if ( allocated )
            chunks_.push_back( newChunk );
    }
    catch ( ... )
    {
        allocated = false;
    }
    if ( !allocated ) return false;

    allocChunk_ = &chunks_.back();
    deallocChunk_ = &chunks_.front();
    return true;
}
Exemplo n.º 3
0
 // create new chunk at front of chain of chunks
 //
 Chunk*
 Zone::NewChunk(int size)
 {
   Chunk* chunk = reinterpret_cast<Chunk*>(Malloced::New(size));
   if (chunk != 0) {
     chunk->Init(head_, size);
     head_ = chunk;
   }
   return chunk;
 }