called by MemAlloc when it is disposed to notify its memory block
increase map count and return cached pointer if map count was zero, it maps the memory to the cached pointer before
decrease map count and unmap memory if it reaches zero
Atomically loads the number of active references.
Atomically increment the reference count.
Atomically decrement the reference count. If refCount reaches zero, and disposeOnZero is set, the object is locked with its own mutex, and dispose is called. In most cases, the calling code should set disposeOnZero, unless it is intended to release the object to give it away. (such as at the end of a builder function)
Returns whether the refCount >= 1. This increases the refCount by 1. rcLock should be used to keep weak reference and ensures that the resource is not disposed. The operation is atomic.
Dispose the underlying resource
A block of memory associated to one DeviceMemory