Move spinlock to SingleSizeCache rather than the slab allocator.
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Key: HBASE-4289
URL: https://issues.apache.org/jira/browse/HBASE-4289
Project: HBase
Issue Type: Sub-task
Reporter: Li Pi
Assignee: Li Pi
Priority: Trivial
The spinlock shouldn't be implemented in the slab allocator, as we don't
necessarily want to spinlock if we try to request too much memory. Instead,
null should be returned, and we'll let the user of the slab allocator determine
what it should do in an OOM situation.
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