Gets the current memory usage for a runtime.

STDAPI_(JsErrorCode)
    JsGetRuntimeMemoryUsage(
    _In_ JsRuntimeHandle runtime,
    _Out_ size_t *memoryUsage);

• runtime: The runtime whose memory usage is to be retrieved.
• memoryUsage: The runtime's current memory usage, in bytes.

The code JsNoError if the operation succeeded, a failure code otherwise.

Memory usage can be always be retrieved, regardless of whether or not the runtime is active on another thread.