Groups > comp.programming.threads > #1345

Re: condvars of ACE framwork - possible bug

Newsgroups	comp.programming.threads
Date	2013-02-07 19:27 -0800
References	(3 earlier) <5ded78d9-8988-45aa-8de0-ccc4b702f7e8@googlegroups.com> <b2771477-2f19-412e-85e5-b30586c4f72c@fv9g2000vbb.googlegroups.com> <4e4762e3-fdf3-4c48-a928-5102961b32b4@googlegroups.com> <ba029ea2-c7b4-44d8-aca7-e87a8be7e93e@x13g2000vby.googlegroups.com> <2321de2f-319e-4858-94be-8215513d2e75@googlegroups.com>
Message-ID	<9e0fa7c5-90ee-428d-a159-696512467bfe@y9g2000vbb.googlegroups.com> (permalink)
Subject	Re: condvars of ACE framwork - possible bug
From	Michael Podolsky <michael.podolsky.69@gmail.com>

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> I agree with your analysis. Under Posix semantics, a signal() should only ever release a thread that is currently blocked in a wait(). In this case, a wait() is being satisfied by a prior call to signal() in the same thread - oops.

A signal may release any thread -- that is what spurious wake ups
about and that is where rechecking the predicate helps.

What is bad in this scenario - the signal is not delivered to  the
thread it must have been delivered.

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Thread

condvars of ACE framwork - possible bug Michael Podolsky <michael.podolsky.69@gmail.com> - 2013-02-04 22:38 -0800
  Re: condvars of ACE framwork - possible bug Codeplug <graham.greene@charter.net> - 2013-02-06 13:42 -0800
    Re: condvars of ACE framwork - possible bug Michael Podolsky <michael.podolsky.69@gmail.com> - 2013-02-06 18:36 -0800
      Re: condvars of ACE framwork - possible bug Codeplug <graham.greene@charter.net> - 2013-02-06 19:39 -0800
        Re: condvars of ACE framwork - possible bug Michael Podolsky <michael.podolsky.69@gmail.com> - 2013-02-06 20:01 -0800
          Re: condvars of ACE framwork - possible bug Codeplug <graham.greene@charter.net> - 2013-02-06 20:16 -0800
            Re: condvars of ACE framwork - possible bug Michael Podolsky <michael.podolsky.69@gmail.com> - 2013-02-06 20:30 -0800
              Re: condvars of ACE framwork - possible bug Codeplug <graham.greene@charter.net> - 2013-02-07 09:05 -0800
                Re: condvars of ACE framwork - possible bug Michael Podolsky <michael.podolsky.69@gmail.com> - 2013-02-07 19:27 -0800
  Re: condvars of ACE framwork - possible bug Noob <root@127.0.0.1> - 2013-02-07 11:54 +0100
    Re: condvars of ACE framwork - possible bug Michael Podolsky <michael.podolsky.69@gmail.com> - 2013-02-07 19:24 -0800

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