Using synchronize does not negate the benefits of using a thread. It all depends on how you are using synchronize. For example, you might have a lengthy process and you want that to run in the background. When you create the thread - in suspend mode, you can pass it parameters (eg. create properties on the TThread subclass). You then tell the thread to resume. On your UI, you might have a cancel button that when clicked, sets a boolean variable. Periodically, the thread may check the value of this variable and terminates if required. You can protect access to this variable using a simple critical section lock. However, the thread also needs to tell the UI when it has complete. This can be done using synchronize - the sync. method runs in the main thread and can safely access the VCL.
How much data does the thread need to read from your UI controls? ----- Original Message ----- From: "Ross Levis" <[EMAIL PROTECTED]> To: "Multiple recipients of list delphi" <[EMAIL PROTECTED]> Sent: Wednesday, September 24, 2003 3:40 PM Subject: Re: [DUG]: random thread crashes > Hi Dennis > > Using synchronize will negate the effect of using a thread in the first > place. I'm not using any methods but I am reading properties. Should I > copy the value of all properties into say global variables before calling > the thread? > > Regards, > Ross Levis. > > ----- Original Message ----- > From: "Dennis Chuah" <[EMAIL PROTECTED]> > To: "Multiple recipients of list delphi" <[EMAIL PROTECTED]> > Sent: Wednesday, September 24, 2003 2:02 PM > Subject: Re: [DUG]: random thread crashes > > > > > > The VCL is not thread safe and parts of it are not re-entrant. You might > > need to use synchronize to sync to your main thread before you call any > VCL > > methods. > > -------------------------------------------------------------------------- - > New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] > Website: http://www.delphi.org.nz > To UnSub, send email to: [EMAIL PROTECTED] > with body of "unsubscribe delphi" > Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/ > --------------------------------------------------------------------------- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz To UnSub, send email to: [EMAIL PROTECTED] with body of "unsubscribe delphi" Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/
