[9fans] port/allocb.c question

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* [9fans] port/allocb.c question
@ 2009-12-09 16:55 Venkatesh Srinivas
  2009-12-09 17:59 ` Charles Forsyth
  0 siblings, 1 reply; 3+ messages in thread
From: Venkatesh Srinivas @ 2009-12-09 16:55 UTC (permalink / raw)
  To: Fans of the OS Plan 9 from Bell Labs

Hi,

In _allocb() in port/allocb.c, there is an _xinc(&b->ref) on a long
inside the Block header. No one else ought have a pointer to this
block yet, seeing as its not done being allocated. Is there any reason
a locked increment is being used?

-- vs

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [9fans] port/allocb.c question
  2009-12-09 16:55 [9fans] port/allocb.c question Venkatesh Srinivas
@ 2009-12-09 17:59 ` Charles Forsyth
  2009-12-09 20:23   ` geoff
  0 siblings, 1 reply; 3+ messages in thread
From: Charles Forsyth @ 2009-12-09 17:59 UTC (permalink / raw)
  To: 9fans

>Is there any reason a locked increment is being used?

good question. i thought it might be a new tradition.
i don't think it's needed.



^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [9fans] port/allocb.c question
  2009-12-09 17:59 ` Charles Forsyth
@ 2009-12-09 20:23   ` geoff
  0 siblings, 0 replies; 3+ messages in thread
From: geoff @ 2009-12-09 20:23 UTC (permalink / raw)
  To: 9fans

I think it's just the idiom we adopted when we added reference
counting.




^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2009-12-09 20:23 UTC | newest]

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2009-12-09 16:55 [9fans] port/allocb.c question Venkatesh Srinivas
2009-12-09 17:59 ` Charles Forsyth
2009-12-09 20:23   ` geoff

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