Jason Evans 7b65180b32 Fix a race condition in the "arenas.extend" mallctl. ...

Fix a race condition in the "arenas.extend" mallctl that could lead to
internal data structure corruption.  The race could be hit if one
thread called the "arenas.extend" mallctl while another thread
concurrently triggered initialization of one of the lazily created
arenas.

2013-10-20 14:39:33 -07:00

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