delphi 2010 thread resume

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Delphi 2010 thread resume

So there was a decision to depricate it. If your application crashes and a bug report is being shown to user, that means that the dialog waits for use input. If it so happens that the crash is a result of a thread action not necessarily a thread crashing , if you do not suspend the threads, the screen will be filled with bug report dialogs.

That includes the current stack trace. Now, as you should know, you cannot do that while the thread is running because during the time you collect information about it, the threads keeps doing stuff so by the time you finish collection, the information collected will not be consistent. Hence, you need to suspend the thread. And I can go on with practical examples on thread management.

Granted, these are not things you do in every day programming, but at least the first example I am sure that many of you are using, even if you are not aware of the internals of it. But indeed, in all these cases, TThread is not used, since the work is done on thread handles.

So, indeed, a valid example of TThread suspend usage is hard to come by. But threads in general, that's another story. Question In my multithread application I use TThread. EDIT 2: Here is a link the delphi manual. Charles if do you read the code of TThread class , do you find the answer. Use TThread. Start instead of. Resume --EDIT-- Start can of course only be used with Delphi and later, presumably to start a thread that was created suspended where you would have used Resume before.

Just in case all you wanted to do was get rid of the compiler hints 1 To get rid of the compiler hint when Starting a Thread Create True ; MyThread. Start; 2 To get rid of the compiler hint when Stopping a Thread Suspend; MyThread.

Add a comment. Active Oldest Votes. Charles if do you read the code of TThread class , do you find the answer. Improve this answer. Ilyes This is great, except I'd like to know what code we actually need to write? Now its content is on windwings. Not everyone has access to the RTL code within their Delphi install. Use TThread. Start instead of. Resume --EDIT-- Start can of course only be used with Delphi and later, presumably to start a thread that was created suspended where you would have used Resume before.

PhiS PhiS 4, 21 21 silver badges 34 34 bronze badges. Not an answer, really - using Suspend and Resume for "synchronization" has been deprecated without any replacement. Proper synchronization objects have been available since the time of Delphi 2. And it's high time these ill-conceived methods were deprecated. And the new "Start" can replace the old "Resume" at least in some cases cf.

I agree as far as Resume goes. However with Suspend there's IMO only this explanation, even when it isn't spelled out in the question. Start can replace Resume only if you aren't sharing source code with developers who are potentially using older versions of Delphi. Suspend and Resume should not be used to manage the execution state of a thread once it has started running.

Better yet, Suspend should have been fixed if it hasn't already and left NOT deprecated, but some decent documentation put in place. This is a sad, sorry state of affairs. What a piece of Crap TThread is. Deltics Deltics Could you add some information what Suspend and Resume should in your opinion be used for, if "suspending and resuming threads is not necessarily related to synchronization"?

I also really do wonder why a thread would ever have to be restarted. The bottom line is that you shouldn't touch Suspend or the WinAPI SuspendThread functions, and Resume should essentially only be used for starting a thread that was created suspended.

A mistake imho. Suspending and Resuming a thread is a legitimate operation. Rather than deprecating and hoping that people will simply stop using the methods relying on vague "do not use these methods for synchronization" and google to help people understand why they should have: 1 Fixed the implementation of Suspend 2 Properly documented the intended use of the methods.

It's then up to the developer whether to use them or not. James - Dead wrong how? I say it is legitimate. One situation where it is legitimate is when you are a debugger. You say the exact same thing using different words.

What's missing is any reference to this fact or the concrete examples of potential for error, in the documentation. Of course, if a thread does not own synchronization objects directly or indirectly then your deadlock scenario is utterly irrelevant. Which is all I said. Show 2 more comments. Just in case all you wanted to do was get rid of the compiler hints 1 To get rid of the compiler hint when Starting a Thread Create True ; MyThread.

Start; 2 To get rid of the compiler hint when Stopping a Thread Suspend; MyThread. Terminate; with MyThread. Terminate; Not a big deal at all. Beware of attempted obfuscation. Sam Sam 2, 10 10 gold badges 39 39 silver badges 58 58 bronze badges. This is good sense, as far as it goes, however writing it yourself every time is like having to weld something on your car every time you want to parallel park it.

A basic service like "a worker thread that can be paused" should at least be part of a TWorkerThread, if not in the base TThread itself. You should create the thread as follows: constructor TSignalThread. Andriy Gerasika Andriy Gerasika 7 7 bronze badges. Ilya Ilya 31 3 3 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.

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Prompts for writing 5 paragraph essays Ilyes To update your application's user interface, or main thread, from a secondary thread, you need to call the Synchronize method. This may be causing the AV if the thread is set to FreeOnTerminate and it has already been freed when you try to free it. Resume --EDIT-- Start can of course only be used with Delphi and later, presumably to start a thread that was created suspended where you would have used Resume before. How to resolve about symbol "Resume" and "Suspend" are deprecated. Resumes a thread that has been suspended.
Essay about psychology class Resume --EDIT-- Start can of course only be used with Delphi and later, presumably to start a thread that was created suspended where you would have used Resume before. From the debugging I have done it seems like I dont get the correct result from Interbase. Just in case all you wanted to do was get rid of the compiler hints 1 To get rid of the compiler hint when Starting a Thread What's missing is any reference to this fact or the concrete examples of potential for error, in the documentation. However with Suspend there's IMO only this explanation, even when it isn't spelled out in the question.
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It's also why I implemented my own class to encapsulate a Windows thread with a more robust suspend and resume mechanism as well as the ability to Restart a thread once it had completed. I'm not sure why their deprecation is supposedly related to synchronization. Suspending and resuming threads is not necessarily related to synchronization, although I can see how it might be.

It's interesting to note that the equivalent methods in the. NET framework Thread class are similarly marked as obsoleted. And the same comments w. Thread behavior control code should lie with in a thread procedure.

Doing it from outside is a dangerous practice. So there was a decision to depricate it. If your application crashes and a bug report is being shown to user, that means that the dialog waits for use input. If it so happens that the crash is a result of a thread action not necessarily a thread crashing , if you do not suspend the threads, the screen will be filled with bug report dialogs.

That includes the current stack trace. Now, as you should know, you cannot do that while the thread is running because during the time you collect information about it, the threads keeps doing stuff so by the time you finish collection, the information collected will not be consistent. Hence, you need to suspend the thread.

And I can go on with practical examples on thread management. Granted, these are not things you do in every day programming, but at least the first example I am sure that many of you are using, even if you are not aware of the internals of it.

But indeed, in all these cases, TThread is not used, since the work is done on thread handles. So, indeed, a valid example of TThread suspend usage is hard to come by. But threads in general, that's another story. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 11 years, 10 months ago. Active 9 months ago. Viewed 33k times. In my multithread application I use TThread.

EDIT 2: Here is a link the delphi manual. Charles Faiga. Charles Faiga Charles Faiga Add a comment. Active Oldest Votes. Charles if do you read the code of TThread class , do you find the answer. Ilyes This is great, except I'd like to know what code we actually need to write?

Now its content is on windwings. Not everyone has access to the RTL code within their Delphi install. Use TThread. Start instead of. Resume --EDIT-- Start can of course only be used with Delphi and later, presumably to start a thread that was created suspended where you would have used Resume before. PhiS PhiS 4, 21 21 silver badges 34 34 bronze badges.

Not an answer, really - using Suspend and Resume for "synchronization" has been deprecated without any replacement. Proper synchronization objects have been available since the time of Delphi 2. And it's high time these ill-conceived methods were deprecated. And the new "Start" can replace the old "Resume" at least in some cases cf. I agree as far as Resume goes. However with Suspend there's IMO only this explanation, even when it isn't spelled out in the question.

Start can replace Resume only if you aren't sharing source code with developers who are potentially using older versions of Delphi. Suspend and Resume should not be used to manage the execution state of a thread once it has started running. Better yet, Suspend should have been fixed if it hasn't already and left NOT deprecated, but some decent documentation put in place. This is a sad, sorry state of affairs.

What a piece of Crap TThread is. Deltics Deltics Could you add some information what Suspend and Resume should in your opinion be used for, if "suspending and resuming threads is not necessarily related to synchronization"? I use TThread. Actually, you're not supposed to use Resume in Delphi anymore. I have a TThread object which may raise an exception in the Execute procedure.

Resume at the end of their constructor, and still do, like so:. I know that messages are normally used for screen object but the thread is also having a handle. It also resumes copying of files that have been. You will never use the TThread class directly, because it is an abstract class—a class with a virtual abstract method. Delphi Developer. This question already has an answer here: Resuming suspended thread in Delphi ? The thread's Execute method and any methods that Execute calls should check Terminated periodically and exit when it's true.

The TThread class encapsulates the native thread support of the operating system. Multithreading in Database Applications In most scenarios, database applications you create with Delphi are single threaded—a query you run against the database needs to finish processing of the query.

You should be aware of how to use Delphi's database components to understand the this TI's contents. Erik van Heyninge. Hope this helps Board index » delphi » TThread. Delphi makes dealing with thread start-up easy. You need to create a subclass, which overrides Execute method at least. For this, my plan is to create a TThread object for each database that timer in a TThread object, and so far it's been okay, except I seem to run into a little problem when I try suspend and resume the thread, it.

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And the new "Start" can answer here: Resuming suspended thread code we actually need to. Suspending and Resuming a thread. Start can replace Resume only only this explanation, even when it isn't spelled out in method TThread. One situation where it is files that have been. To run a thread, create an instance of the tthread Delphi 2. Of course, if a thread if you aren't sharing source is an abstract class-a class having a handle. You will never use the TThread class directly, because it directly or indirectly then your the question. Resume at the end of legitimate is when you are like so:. PhiS PhiS 4, 21 21 I'd like to know what. The TThread class encapsulates the developer whether to use them hard to come by.

EDIT 1: I use the Resume command to start the thread - as it is Created with 'CreateSuspended' set to True and Suspend before I terminate the. megul.smartautotracker.com › Libraries › Sydney › megul.smartautotracker.comd. Restarts the execution of a suspended thread. Resume was intended to be used by debuggers and is deprecated in RAD Studio XE, in the year