scoped_ptr<base::SharedMemory> RenderThreadImpl::AllocateSharedMemory(
    size_t size) {
  return scoped_ptr<base::SharedMemory>(
      HostAllocateSharedMemoryBuffer(size));
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.