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Subject: Re: [boost] [1.44] Beta progress?
From: Gaetano Mendola (mendola_at_[hidden])
Date: 2010-07-26 10:40:53

On 07/26/2010 04:01 PM, Anthony Williams wrote:
> Undefined behaviour --- all concurrent calls to condition_variable::wait
> must use the same mutex. You can use different mutexes with
> condition_variable_any, and you can use different mutexes for separate
> waits, but not for concurrent ones.

That pattern was indeed the result of a bug in our application.
I was wondering if that can be spotted with a runtime error (or an
assert for the matter) at least with NDEBUG not defined, for example
the condition_variable::wait can check with __sync_bool_compare_and_swap
if it's running concurrently with another call with a different mutex.

I'm actualy using the above technique to spot if someone is using a
not thread safe class concurrently from different threads.

Gaetano Mendola

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