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_umtx_op: document UMTX_OP_SEM2_WAIT copyout behavior
authorkevans <kevans@FreeBSD.org>
Tue, 17 Nov 2020 03:26:56 +0000 (03:26 +0000)
committerkevans <kevans@FreeBSD.org>
Tue, 17 Nov 2020 03:26:56 +0000 (03:26 +0000)
commit790b887b590b247429f8f07b300e97bd58c50d5f
tree0a837e5461d8408ed211235ad1b5c5ab7228c33ftree | snapshot
parentee4a4508e1d2ffc741e0f48be0c79ac6fca8254bcommit | diff
_umtx_op: document UMTX_OP_SEM2_WAIT copyout behavior

This clever technique to get a time remaining back was added to support sem_clockwait_np.

Reviewed by: kib, vangyzen
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D27160
lib/libc/sys/_umtx_op.2 diff | blob | history
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