[Hurd] Fix hang on fork
diff mbox

Message ID 20140828183157.GH3011@type.youpi.perso.aquilenet.fr
State New
Headers show

Commit Message

Samuel Thibault Aug. 28, 2014, 6:31 p.m. UTC
Roland McGrath, le Thu 28 Aug 2014 11:21:08 -0700, a écrit :
> Fix comment formatting, put space before paren,

Right, I really need to teach my editor to do the comments properly
automatically...

> write a ChangeLog entry.

This is what I had put, is some information still missing?

* sysdeps/mach/hurd/fork.c (__fork): Lock SS->lock around __proc_dostop() call.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

---
 sysdeps/mach/hurd/fork.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Roland McGrath Aug. 28, 2014, 8:04 p.m. UTC | #1
> This is what I had put, is some information still missing?

Oh, was that in the message?  I must have missed it because I didn't see a
ChangeLog header.

> * sysdeps/mach/hurd/fork.c (__fork): Lock SS->lock around __proc_dostop() call.

Don't use () as if it were part of a function name.  Otherwise that is just
right (though it's ok to omit " (__fork)" in a libc file whose file name
matches the function).

> +      /* Keep our SS locked while stopping other threads, so they don't get a
> +         chance to be having it locked in the copied space.  */

I didn't bother to say that this sentence is rather awkward to a native
English speaker: s/to be having it locked/to have it locked/.

The formatting is now correct, so you can go ahead and commit.


Thanks,
Roland
Samuel Thibault Aug. 28, 2014, 8:13 p.m. UTC | #2
Roland McGrath, le Thu 28 Aug 2014 13:04:14 -0700, a écrit :
> > This is what I had put, is some information still missing?
> 
> Oh, was that in the message?  I must have missed it because I didn't see a
> ChangeLog header.

Ah, probably, indeed.

> (though it's ok to omit " (__fork)" in a libc file whose file name
> matches the function).

Ok.

Thanks,
Samuel

Patch
diff mbox

diff --git a/sysdeps/mach/hurd/fork.c b/sysdeps/mach/hurd/fork.c
index ab11bab..1f0b8a3 100644
--- a/sysdeps/mach/hurd/fork.c
+++ b/sysdeps/mach/hurd/fork.c
@@ -122,9 +122,13 @@  __fork (void)
       ports_locked = 1;
 
 
+      /* Keep our SS locked while stopping other threads, so they don't get a
+         chance to be having it locked in the copied space.  */
+      __spin_lock (&ss->lock);
       /* Stop all other threads while copying the address space,
 	 so nothing changes.  */
       err = __proc_dostop (_hurd_ports[INIT_PORT_PROC].port, ss->thread);
+      __spin_unlock (&ss->lock);
       if (!err)
 	{
 	  stopped = 1;