bdccf0bbac
As per r177853, we need to avoid using errno inside user mutex code, since signal handlers can interfere with it and mess up libthr internal state. So, implement _umtx_op_err() instead, which makes a raw syscall and returns the error value directly instead of using errno. Approved by: jhibbits (mentor) Differential Revision: https://reviews.freebsd.org/D20946 |
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