linux-imx

Note that under this approach, contrary to previous PI-futex approaches,

there is no prior 'registration' of a PI-futex. [which is not quite

possible anyway, due to existing ABI properties of pthread mutexes.]

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Also, under this scheme, 'robustness' and 'PI' are two orthogonal

properties of futexes, and all four combinations are possible: futex,

robust-futex, PI-futex, robust+PI-futex.

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More details about priority inheritance can be found in