Is STL queue Thread Safe?

[Sriram Rajagopalan]

Hi,

Are STL queues thread safe in the scenario below:

I have 2 threads, one pushing to the rear end of the STL queue.. then
posting a semaphore- The other thread waits for the semaphore and would
access the front of the queue. The semaphore is initialized to 0.

Is there a possiblity of race condition in the above scenario?

Thanks,
Sriram.

[John Harrison]

Re: Is STL queue Thread Safe?


"Sriram Rajagopalan" <sriram@mot.com > wrote in message
news:cmveo6$ogs $1@newshost.mot .com...[color=blue]
> Hi,
>
> Are STL queues thread safe in the scenario below:
>
> I have 2 threads, one pushing to the rear end of the STL queue.. then
> posting a semaphore- The other thread waits for the semaphore and would
> access the front of the queue. The semaphore is initialized to 0.
>
> Is there a possiblity of race condition in the above scenario?
>
> Thanks,
> Sriram.
>[/color]

C++ standard makes no mentions of threads at all. So whether your STL is
thread safe depends entirely on the implementation. Consult your
documentation.

john

[Stephan Br?nnimann]

Re: Is STL queue Thread Safe?

"Sriram Rajagopalan" <sriram@mot.com > wrote in message news:<cmveo6$og s$1@newshost.mo t.com>...[color=blue]
> Hi,
>
> Are STL queues thread safe in the scenario below:
>
> I have 2 threads, one pushing to the rear end of the STL queue.. then
> posting a semaphore- The other thread waits for the semaphore and would
> access the front of the queue. The semaphore is initialized to 0.[/color]

Please be more specific:
What are you using as semaphore?
[color=blue]
>
> Is there a possiblity of race condition in the above scenario?
>
> Thanks,
> Sriram.[/color]

C++ does not deal with threads, currently there are many on-going
discussions in c.l.c++.m.
By this nothing of the STL is thread-safe.

If you properly control the access to the queue with a semaphore
then yes, it is thread safe.

regards,
Stephan Brönnimann
broeni@osb-systems.com
Open source rating and billing engine for communication networks.