cvs commit: src/sys/kern syscalls.master src/sys/sys sysproto.h umtx.h

David Xu davidxu at
Tue Mar 28 09:29:34 UTC 2006

Dag-Erling Smorgrav wrote:
> des         2006-03-28 09:18:34 UTC
>   FreeBSD src repository
>   Modified files:
>     sys/kern             syscalls.master 
>     sys/sys              sysproto.h umtx.h 
>   Log:
>   The undocumented and deprecated system call _umtx_op() takes two pointer
>   arguments.  The first one is never used (all callers pass in 0); the
>   second is sometimes used to pass in a struct timespec * which is used as
>   a timeout and never modified.  Constify that argument so callers can pass
>   a const struct timespec * without jumping through hoops.
>   Revision  Changes    Path
>   1.214     +1 -1      src/sys/kern/syscalls.master
>   1.193     +1 -1      src/sys/sys/sysproto.h
>   1.18      +3 -3      src/sys/sys/umtx.h

This is an incorrect change, please backout it. the _umtx_op parameters
never should only accept const void *, in fact, the interface was
designed to extendable for future use. you can use __DECONST macro in
umtx.h to disable compiler warnings, breaking it could cause FreeBSD to 
not have optimized thread library can be when you want to
change umtx code, please discuss with me first.

David Xu

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