Fix SIGCHLD suspension for fork()-based file locks (i.e., Solaris).
Also, fix commit ea51d32e, which broke termination of process groups
where the main process terminated before the rest of the group,
because it used sigwait() before the terminate action.
Make the GC always use the mmap() block cache, since mmap() on Solaris
allocates much more than a page when a single page is requested.
Enable places and threads by default on x86 and x86_64.
Fix pthread-related compilation flags.
the check is to avoid drawing check syntax arrows
that go too far away; this may not be really possible
anymore, but in the past the old limit could be hit with
a long file and an arrow that went its length
Add `dimension-integer?', `position-integer?',
`spacing-integer?', and `positive-dimension-integer?' to make
the documentation, especially, more parameterized over the
limit.
Also, make the slider limits match the dimension/position limit,
since they're often related.
Things go wrong with, for example, a canvas that is
larger than 32k in a dimension. It looks like there's
a problem on each platform, although not exactly the
same problem. Meanwhile, even larger scrollable panels
can work ok on platforms other than Windows.
Closes PR 13849
I'm not sure if the precise details of how this function behaves
(specifically that it copies snips that aren't cacheable) is
important, but I suspect the implementation is more authoritative
that the docs in this case, so document what it really does.
closes PR 13956
since snips will silently fail to be inserted when
they are already inserted and some ports just take
snips and insert them into editors without copying
them first
closes PR 13960
closes PR 13946
This is probably not the optimal way to make this change; better would
have been to refactor the existing provide/contract implementation so
it does not glom the provides all together in the first place (instead
of pulling them out afterwards). Do it this way anyways, because I
have a big pile of contract-system changes in another branch that also
changes around how provide/contract works: this way will be much
easier to rebase those changes off of.
