IIRC Solaris mutexes are declared either simple spin or adaptive,
an acquisition attempt of the latter only checking the hold
status of the mutex and if held the owner's run status before
making the spin vs. block decision.
I don't believe mixing of the two mutex types within a given path
was permissible as a previously acquired simple spin mutex could
remain held when a subsequent adaptive mutex decided to block.
Although presumably an elevated IPL could have been sufficient to
flag that scenario.
-john
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john.cooper@third-harmonic.com
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