ArrayList

  • Thread starter Thread starter Igor
  • Start date Start date
I

Igor

Hi.
I have ArrayList shared by many threads, I synchronized it with mutex. Now I
discovered in MSDN that ArrayList should be synchronized with
lock() and SyncRoot. Is it a problem that I synchronized it with mutex and
what is the difference?

Thanks.
 
Hi, Igor!

You are better to use ArrayList.Synchronized(); method it makes all work for
you.

I> Hi.
I> I have ArrayList shared by many threads, I synchronized it with mutex.
I> Now I discovered in MSDN that ArrayList should be synchronized with
I> lock() and SyncRoot. Is it a problem that I synchronized it with mutex
I> and what is the difference?

I> Thanks.


Me.
 
Igor said:
I have ArrayList shared by many threads, I synchronized it with
mutex. Now I discovered in MSDN that ArrayList should be synchronized
with lock() and SyncRoot. Is it a problem that I synchronized it with
mutex and what is the difference?
Click to expand...

A mutex is rather "heavier", but I imagine it should still work. (It'll
certainly stop simultaneous access, but I don't know for sure whether
it'll cause a memory barrier. I'd imagine it would.)

lock(...) is much easier to work with, of course :)

See
http://www.pobox.com/~skeet/csharp/threads/waithandles.shtml for more
info.
 
Ivan G. said:
You are better to use ArrayList.Synchronized(); method it makes all work for
you.
Click to expand...

No it doesn't. It synchronizes each individual operation. It doesn't
synchronize blocks of code, which is very often what you want to do -
for instance, if you want to iterate through the list.

Personally I'd stick with locking on SyncRoot - you'll have to do it in
some circumstances anyway, so it's easier to be consistent about it
than use Synchronized() and have to work out when that's not
sufficient.
 
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