[THIN] Re: Quickbooks 2008 on CAE and W2k3
- From: "Steve Greenberg" <steveg@xxxxxxxxxxxxxx>
- To: <thin@xxxxxxxxxxxxx>
- Date: Fri, 26 Sep 2008 10:41:20 -0700
Wow, no toilet jokes yet, I thought you all would be over that one!!
Steve Greenberg
Thin Client Computing
34522 N. Scottsdale Rd D8453
Scottsdale, AZ 85266
(602) 432-8649
www.thinclient.net
steveg@xxxxxxxxxxxxxx
_____
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Steve Greenberg
Sent: Friday, September 26, 2008 8:53 AM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Quickbooks 2008 on CAE and W2k3
Well since I didn't know what either a mutex or a semaphore was I found this
and share it here:
<http://geekswithblogs.net/shahed/archive/2006/06/09/81268.aspx>
http://geekswithblogs.net/shahed/archive/2006/06/09/81268.aspx
Mutex vs. Semaphore, what is the difference?
The Toilet Example (c) Copyright 2005, Niclas Winquist ;)
Mutex:
Is a key to a toilet. One person can have the key - occupy the toilet - at
the time. When finished, the person gives (frees) the key to the next person
in the queue.
Officially: "Mutexes are typically used to serialise access to a section of
re-entrant code that cannot be executed concurrently by more than one
thread. A mutex object only allows one thread into a controlled section,
forcing other threads which attempt to gain access to that section to wait
until the first thread has exited from that section."
Ref: Symbian Developer Library
(A mutex is really a semaphore with value 1.)
Semaphore:
Is the number of free identical toilet keys. Example, say we have four
toilets with identical locks and keys. The semaphore count - the count of
keys - is set to 4 at beginning (all four toilets are free), then the count
value is decremented as people are coming in. If all toilets are full, ie.
there are no free keys left, the semaphore count is 0. Now, when eq. one
person leaves the toilet, semaphore is increased to 1 (one free key), and
given to the next person in the queue.
Officially: "A semaphore restricts the number of simultaneous users of a
shared resource up to a maximum number. Threads can request access to the
resource (decrementing the semaphore), and can signal that they have
finished using the resource (incrementing the semaphore)."
Ref: Symbian Developer Library
Steve Greenberg
Thin Client Computing
34522 N. Scottsdale Rd D8453
Scottsdale, AZ 85266
(602) 432-8649
www.thinclient.net
steveg@xxxxxxxxxxxxxx
_____
From: thin-bounce@xxxxxxxxxxxxx [mailto:thin-bounce@xxxxxxxxxxxxx] On Behalf
Of Rick Mack
Sent: Thursday, September 25, 2008 7:47 PM
To: thin@xxxxxxxxxxxxx
Subject: [THIN] Re: Quickbooks 2008 on CAE and W2k3
Hi Gehan,
Quickbooks 2008/2007 uses a global mutex as a semaphore so that only one
instance of QB will run.
I specificall covered how to handle the QB global mutex issue in my talk at
Briforum 2008. You should be able to get my video from
<http://www.briforum.com/BriForum-2008-Chicago/session.asp?id=338>
http://www.briforum.com/BriForum-2008-Chicago/session.asp?id=338
regards,
Rick
--
Ulrich Mack
Quest Software
Provision Networks Division
On Tue, Sep 23, 2008 at 3:27 PM, < <mailto:Gehan.DeSilva@xxxxxxxxxxx>
Gehan.DeSilva@xxxxxxxxxxx> wrote:
Hello
Im most curious about this also as i have not yet been able to get this
going.
Nick when you run Quickbooks with multiple users at the same time does it
throw a message "Quickbooks is already running"
Regards
____________________________________________________
Gehan De Silva
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