Subject: Re: p_flag in struct proc: int -> uint64_t
To: Juergen Hannken-Illjes <firstname.lastname@example.org>
From: Jason Thorpe <email@example.com>
Date: 10/09/2006 15:45:28
On Oct 9, 2006, at 1:43 AM, Juergen Hannken-Illjes wrote:
> The latter. Call xxx_set() and xxx_get() with locks held.
Ok, well, getspecific is guaranteed to never sleep -- it acquires a
simple_lock, but that should ~never be contended, and it will only
spin in the contented case. For LWPs, it currently does not even
acquire the simple_lock, because an LWPs specificdata should only be
accessed by the LWP itself (except under certain very controlled
For setspecific, I could add a setspecific_nowait, but I'm concerned
about what the failure mode is supposed to be if it were to fail...
would you unwind your state, and try to set the data some other way,
or would you fail the operation in some fashion?