Incomplete.

Proposed

Futex

Add a futex kernel trap to GNU Mach. This can be useful for nicer locking primitives, including inter-process primitives. vm_allocate can be used as an example in the gnumach source tree for how to add a kernel trap.

GNU Savannah task #6231

Patches on bug-hurd

IRC, freenode, #hurd, 2014-01-20

<teythoon> braunr: i meant to ask about the futex stuff
<teythoon> what do you mean when you talk about the interface ?
<teythoon> i imagined something like this
<braunr> more precisely ?
<teythoon> for shared futexes, do not use a pointer, but a right
  referencing a memory object, and the offset ?
<braunr> why not a pointer ?
<braunr> well, an address
<teythoon> that's how it's currently done, right ?
<teythoon> in marins prototype i mean
<braunr> yes
<braunr> it's a task/address pair
<teythoon> so the only concern is the access in the kernel ?
<braunr> hum not only no
<braunr> or yes, but there are multiple ways to access
<teythoon> i meant to say this, for me, it would be very helpful if you
  were more explicit when you describe how you picture something
<braunr> i thought i did it clearly
<braunr> i even agree with what roland describes
<braunr> which looks even clearer
<braunr> also, i said i didn't picture it completely
<braunr> :)
<braunr> i didn't want to work on that, only review
<teythoon> sure, but what might be clear to you is most likely not that
  clear to me
<braunr> ok