[m-rev.] diff: Fix bug #233

[Julien Fischer]

On Thu, 24 Nov 2011, Paul Bone wrote:

> Fix an error where the runtime system aborted with "sem_post: Invalid
> argument".
>
> runtime/mercury_context.c:
>    The error message as important, since sem_timedwait actually raised the
>    error.  When this occurred the error was incorrectly reported as being
>    raised by the sem_post syscall.
>
>    Use >= rather than > when testing if the nanoseconds field of a timeval
>    structure for sem_timedwait should overflow into the seconds field.

Does this also need to go on to the release branch?

Julien.
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