Thanks for all the replies. I mistakenly convinced myself that an object instance belonged to a particular thread as it would if it was in another process (space). However I realise this is not the case.
I am confused as to why you would pass messages to communicate between threads though, could you not just update a central memory location? Or is this because of the race condition? I think I just need to find a real world example to put it into context. Michael Darling Solution Developer ROOM Solutions Ltd mailto:[EMAIL PROTECTED] -----Original Message----- From: Rob Kennedy [mailto:[EMAIL PROTECTED] <SNIP> A thread can send a message to a window that belongs to another thread. In that case, the sending thread will wait for the receiving thread to handle the message and return a result. Variables are just memory locations. They don't belong to any threads. Two threads reading from the same memory location simultaneously is safe. The unsafe thing is when you have one thread writing to a memory location and another thread reading or writing to that same location. Then you have a race condition and might end up with corrupted data. Protect against that situation with some form of synchronization. A critical section is a common technique. <SNIP> -------------------------------------------------------- Room Solutions Limited is a leading supplier of solutions and services to non-life commercial insurance markets. Room Solutions Limited is registered in England and Wales with company number 2503575. Its registered office is at 100 New Bridge Street, London EC4V 6YA, United Kingdom. CONFIDENTIALITY NOTICE/DISCLAIMER This email and any attachments are confidential, protected by copyright/intellectual property rights and may be legally privileged. The information transmitted is intended only for the person or entity to which it is addressed. If you are not the intended recipient, dissemination or copying of this email is prohibited. If you have received this in error, please notify us by forwarding this email to the following address: [EMAIL PROTECTED] , and then delete the email completely from your system. This email and any attachments have been scanned for computer viruses by a market leading anti-virus system. However, it is the responsibility of the recipient to conduct its own security measures. No responsibility is accepted by ROOM Solutions Limited for loss or damage arising from the receipt or use of this email and any attachments. No responsibility is accepted by ROOM Solutions Limited for personal emails. ROOM Solutions Ltd, http://www.roomsolutions.net -------------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________ _______________________________________________ Delphi mailing list -> [email protected] http://www.elists.org/mailman/listinfo/delphi
