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Re: [PATCH 5/4] run-command: implement abort_async for pthreads

From
Erik Faye-Lund <kusmabite@gmail.com>
Date
Apr 1, 2011, 20:13 UTC
Message-ID
<AANLkTi=ro88pwpA+Gfu5p2dB3ntn8PUcwvjHRh3iRy_H@mail.gmail.com>
In-Reply-To
<20110401200537.GA15778@sigill.intra.peff.net>
On Fri, Apr 1, 2011 at 10:05 PM, Jeff King <peff@peff.net> wrote:
Show 12 quoted lines
> On Fri, Apr 01, 2011 at 09:57:14PM +0200, Erik Faye-Lund wrote:
>
>> > But this does not help the case at hand in any way. How would you interrupt a
>> > thread that is blocked in ReadFile()? The point of pthread_cancel() is that
>> > it interrupts blocked system calls
>>
>> There is no mention of such a guarantee in POSIX (section 2.9.5 Thread
>> Cancellation), so relying on that is undefined behavior.
>
> Eh? My pthreads(7) says that read() is required to be a cancellation
> point acrroding to POSIX. I didn't dig up the actual reference in the
> standard, though.

I don't understand where the implementor would get that from after reading through it, but if there's something I've missed we can fix it by replacing my pthread_cancel with this, no?

static inline int pthread_cancel(pthread_t thread)
{
	SetEvent(thread.cancel_event);
	CancelSynchronousIo(thread.handle);
}
Previous: Jeff KingNext: Jeff King
Message 36 of 48 in “fix hang in git push when pack-objects fails”
  1. 0/4 fix hang in git push when pack-objects failsJeff King, Mar 31, 2011
  2. 1/4 teach wait_or_whine a "quiet" modeJeff King, Mar 31, 2011
  3. Johannes SixtMar 31, 2011
  4. Jeff KingApr 1, 2011
  5. 2/4 finish_async: be quiet when waiting for async processJeff King, Mar 31, 2011
  6. 3/4 run-command: allow aborting async code prematurelyJeff King, Mar 31, 2011
  7. Erik Faye-LundApr 1, 2011
  8. Jeff KingApr 1, 2011
  9. 4/4 send-pack: abort sideband demuxer on pack-objects errorJeff King, Mar 31, 2011
  10. Johannes SixtApr 13, 2011
  11. Jeff KingApr 14, 2011
  12. Johannes SixtApr 14, 2011
  13. Jeff KingApr 14, 2011
  14. Johannes SixtApr 14, 2011
  15. Jeff KingApr 14, 2011
  16. Johannes SixtApr 14, 2011
  17. Junio C HamanoApr 14, 2011
  18. 1/2 send-pack --stateless-rpc: properly close the outgoing channelJohannes Sixt, Apr 24, 2011
  19. 2/2 send-pack: avoid deadlock when pack-object dies earlyJohannes Sixt, Apr 24, 2011
  20. Jeff KingApr 25, 2011
  21. Johannes SixtApr 25, 2011
  22. Junio C HamanoApr 25, 2011
  23. send-pack: avoid deadlock when pack-object dies earlyJohannes Sixt, Apr 25, 2011
  24. Jeff KingApr 26, 2011
  25. Jeff KingApr 25, 2011
  26. 5/4 run-command: implement abort_async for pthreadsJeff King, Mar 31, 2011
  27. Erik Faye-LundApr 1, 2011
  28. Erik Faye-LundApr 1, 2011
  29. Johannes SixtApr 1, 2011
  30. Jeff KingApr 1, 2011
  31. Erik Faye-LundApr 1, 2011
  32. Erik Faye-LundApr 1, 2011
  33. Johannes SixtApr 1, 2011
  34. Erik Faye-LundApr 1, 2011
  35. Jeff KingApr 1, 2011
  36. Erik Faye-LundApr 1, 2011
  37. Jeff KingApr 1, 2011
  38. Jeff KingApr 1, 2011
  39. Erik Faye-LundApr 1, 2011
  40. Johannes SixtApr 1, 2011
  41. Erik Faye-LundApr 1, 2011
  42. Johannes SixtApr 1, 2011
  43. Erik Faye-LundApr 1, 2011
  44. Jeff KingApr 1, 2011
  45. Erik Faye-LundApr 2, 2011
  46. Jeff KingApr 1, 2011
  47. Johannes SixtMar 31, 2011
  48. Jeff KingApr 1, 2011

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