Right now, we allow anything inside a user to raise or lower any other process's
priority. This feels simple enough to me. Linux disallows raising, but
that's annoying in practice.
links requests SO_ERROR, so in not supporting it, things were unhappy.
Supporting this properly looks a little messy. I guess Socket will need
an m_error member it sets everywhere it returns an error. Or Syscall
could set it, perhaps, but I don't know if that's the right thing to
do, so let's just stub this for now and file a bug.
Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.
By moving the sending (and receiving) thread into the BlockedSignal state,
we ensure that the thread doesn't continue executing until the signal
has been dispatched.
It's good to have a place where we can try out all the different widgets.
This needs some more work on a nice layout, and should also include more
of the widgets. :^)
This is in preparation for eventually using it in userspace.
LinearAddress.h has not been moved for the time being (as it seems to be
only used by a very small part of the code).
Since we transition to a new PageDirectory on exec(), we need a matching
RangeAllocator to go with the new directory. Instead of juggling this in
Process and MemoryManager, simply attach the RangeAllocator to the
PageDirectory instead.
Fixes#61.
This gives us some leeway for WindowServer to queue up a bunch of messages
for one of its clients. Longer-term we should improve DoubleBuffer to be
able to grow dynamically in a way that gets billed to some reasonable place.
Passing this flag to recv() temporarily puts the file descriptor into
non-blocking mode.
Also implement LocalSocket::recv() as a simple forwarding to read().
can_write() was saying yes in situations where write() would overflow the
internal buffer. This patch adds a has_attached_peer() helper to make it
easier to understand what's going on in these functions.
This is not EOF, and never should have been so -- can trip up other code
when porting.
Also updates LibGUI and WindowServer which both relied on the old
behaviour (and didn't work without changes). There may be others, but I
didn't run into them with a quick inspection.
There are now two thread lists, one for runnable threads and one for non-
runnable threads. Thread::set_state() is responsible for moving threads
between the lists.
Each thread also has a back-pointer to the list it's currently in.
select essentially has 3 modes (which is presumably why we're finding it
so hard to get this right in a reliable way :)).
1. NULL timeout -- no timeout on blocking
2. non-NULL timeout that is not zero'd -- timeout on blocking
3. non-NULL but zero timeout -- no blocking at all (immediate poll)
For cases 1 and 2, we want to block the thread. We have a timeout set
only for case 2, though.
Case 3 should not block the thread, and does not have a timeout set.
