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Re: pthread mutex used like a semaphore. Why does it work?

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On Mon, 19 May 2014 08:32:53 +0200, Xavier Roche wrote:

> On 05/18/2014 08:51 PM, Charles T. Smith wrote:
>> I'm looking at a piece of code where one thread locks a mutex at
>> regular intervals and a different thread frees that lock.  I thought it
>> was an error for a different thread to free a mutex, but it seems to be
>> working and there's no error code.
> 
> It probably "works", but it is also probably... not thread-safe.

In what way, not thread-safe?  You mean if there were more than these two 
threads?  I mean, if it works in this, the intended case, then what could 
be unsafe about it...

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pthread mutex used like a semaphore.  Why does it work? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-18 18:51 +0000
  Re: pthread mutex used like a semaphore.  Why does it work? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-18 19:26 +0000
  Re: pthread mutex used like a semaphore.  Why does it work? Xavier Roche <xroche@free.fr.NOSPAM.invalid> - 2014-05-19 08:32 +0200
    Re: pthread mutex used like a semaphore.  Why does it work? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-19 08:16 +0000
  Re: pthread mutex used like a semaphore.  Why does it work? Richard Kettlewell <rjk@greenend.org.uk> - 2014-05-19 09:12 +0100
    Re: pthread mutex used like a semaphore.  Why does it work? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-19 08:27 +0000
  Re: pthread mutex used like a semaphore.  Why does it work? Mark <i@dontgetlotsofspamanymore.invalid> - 2014-05-19 10:50 +0100
  Re: pthread mutex used like a semaphore.  Why does it work? Chick Tower <c.tower@deadspam.com> - 2014-05-19 19:16 +0000
    Re: pthread mutex used like a semaphore.  Why does it work? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-20 10:24 +0000
      Re: pthread mutex used like a semaphore.  Why does it work? David Brown <david.brown@hesbynett.no> - 2014-05-20 21:27 +0200
      Re: pthread mutex used like a semaphore.  Why does it work? Chick Tower <c.tower@deadspam.com> - 2014-05-21 02:22 +0000
    Re: pthread mutex used like a semaphore.  Why does it work? Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2014-05-20 22:33 -0400
  Re: pthread mutex used like a semaphore.  Why does it work? James Moe <jimoeDESPAM@sohnen-moe.com> - 2014-05-20 11:13 -0700
    Re: pthread mutex used like a semaphore.  Why does it work? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-20 19:39 +0000
      Re: pthread mutex used like a semaphore.  Why does it work? Mark <i@dontgetlotsofspamanymore.invalid> - 2014-05-22 08:59 +0100

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