Multithreading problem

[Boni]

Dear all,
it seems that I have a multithreadng problem. I am not sure.
class A
UID as integer
shared ctr as integer=0
sub new()
UID=ctr
ctr+=1
end sub

end

Sometime I get 2 A objects with the same UID. I don't explicitely start
thread. Also it it possible that my class library is called from many
threads.
In order to find out, if it is really threading problem I need unique some
sort thread ID, which will be unique for each thread ?
But I can find only domainID in threading.thread.
Please is it possible to get some unique threadID or hashcode or something
else in .NET 1.1?

[Ken Tucker [MVP]]

Hi,

SyncLock prevents multiple threads from executing the same code at
the same time.

http://msdn.microsoft.com/library/de...tmsynclock.asp

Ken
---------------------------
"Boni" <oilia@nospam> wrote in message
news:OZ**************@TK2MSFTNGP12.phx.gbl...

Dear all,
it seems that I have a multithreadng problem. I am not sure.
class A
UID as integer
shared ctr as integer=0
sub new()
UID=ctr
ctr+=1
end sub

end

Sometime I get 2 A objects with the same UID. I don't explicitely start
thread. Also it it possible that my class library is called from many
threads.
In order to find out, if it is really threading problem I need unique some
sort thread ID, which will be unique for each thread ?
But I can find only domainID in threading.thread.
Please is it possible to get some unique threadID or hashcode or something
else in .NET 1.1?

[Boni]

Hi Ken
I know SyncLock. The problem is that I am not really sure if it is because
of multithreading. So I would like to output threadID or some other unique
thread info.
Is it possible?
Thanks,
Boni
"Ken Tucker [MVP]" <vb***@bellsouth.net> schrieb im Newsbeitrag
news:OB**************@TK2MSFTNGP15.phx.gbl...

Hi,

SyncLock prevents multiple threads from executing the same code at
the same time.

http://msdn.microsoft.com/library/de...tmsynclock.asp

Ken
---------------------------
"Boni" <oilia@nospam> wrote in message
news:OZ**************@TK2MSFTNGP12.phx.gbl...

Dear all,
it seems that I have a multithreadng problem. I am not sure.
class A
UID as integer
shared ctr as integer=0
sub new()
UID=ctr
ctr+=1
end sub

end

Sometime I get 2 A objects with the same UID. I don't explicitely start
thread. Also it it possible that my class library is called from many
threads.
In order to find out, if it is really threading problem I need unique
some sort thread ID, which will be unique for each thread ?
But I can find only domainID in threading.thread.
Please is it possible to get some unique threadID or hashcode or
something else in .NET 1.1?

[AMercer]

To safely do what you want, try Threading.Interlocked.Increment().
Also, be advised that static applies to an AppDomain, a gotcha for the unwary.

[david]

On 2005-09-05, AMercer <AM*****@discussions.microsoft.com> wrote:

To safely do what you want, try Threading.Interlocked.Increment().
That won't fix the problem, since it's possible for objects in different
threads to acquire the same UID previous to the atomic increment.

Also, be advised that static applies to an AppDomain, a gotcha for the unwary.

[AMercer]

> That won't fix the problem, since it's possible for objects in different

threads to acquire the same UID previous to the atomic increment.

in the constructor,
uid=Threading.Interlocked.Increment(ctr)
gets the job done for all threads in the same appdomain.

[david]

On 2005-09-05, AMercer <AM*****@discussions.microsoft.com> wrote:

That won't fix the problem, since it's possible for objects in different
threads to acquire the same UID previous to the atomic increment.

in the constructor,
uid=Threading.Interlocked.Increment(ctr)
gets the job done for all threads in the same appdomain.

You're right of course. Somehow I got focused on the fact that the
assignment was on a different line in the original post and commented
on that.