Make a small function thread safe

[Brad Tilley]

On Fri, Dec 16, 2011 at 9:24 AM, Brad Tilley <kj4eit at gmail.com> wrote:

>
>
> On Fri, Dec 16, 2011 at 8:33 AM, Tim Wintle <tim.wintle at teamrubber.com>wrote:
>
>> On Fri, 2011-12-16 at 05:21 -0800, Brad Tilley wrote:
>> > 107         void increment_counter( unsigned int& counter )
>> > 108         {
>> > 109                 boost::mutex::scoped_lock lock( counter_lock );
>> > 110                 ++counter;
>> > 111         }
>>
>>
>> with counter_lock:
>>    counter += 1
>>
>>
>> ... where counter_lock is a threading.Lock instance.
>>
>> (see docs for the threading module)
>
>
>
>
> So something like this then:
>
> import threading
>
> shared_container = []
> lock = threading.Lock()
>
> class thread_example( threading.Thread ):
>
>     def __init__( self ):
>         threading.Thread.__init__ (self)
>
>     def run(t):
>         lock
>         shared_container.append(t.name)
>
> # main
>
> threads = []
> for i in xrange(10):
>     thread = thread_example()
>     threads.append(thread)
>
> for thread in threads:
>     thread.start()
>
> for item in shared_container:
>     print item
>
>
Or perhaps run should look like this instead:

    def run(t):
        lock.acquire()
        shared_container.append(t.name)
        lock.release()

That seems a bit barbaric to me, not sure.
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