Delphi string thread safe

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August undefined, 2024

WebMay 2, 2013 · No conflicts about thread safety and a clear description on causality. For a thread-safe queue, look at TThreadedQueue if you have Delphi-XE2 or newer. Here is an example outlining the above described queue approach. WebJun 20, 2024 · Pass the reference to this object via the additional parameters in PostMessage is an open door to unexpected memory leaks, IMHO - a thread-safe queue is IMHO much safer: in this case, you just send a notification message, and all pending information is retrieved from the queue, even by-passing the deprecated values, if needed.

Are class properties thread safe in delphi? - Stack Overflow

WebAug 27, 2024 · Newer Delphi versions come with CodeSite. SmartInspect is another alternative. Use synchronization primitives to make your class thread-safe: TCriticalSection, TMREWSync Make sure you understand the issues involved in multithreading and synchronization before attempting to write a thread-safe logging framework. WebOct 31, 2015 · How i can pass pchar from the DLL? dll must be compatible with other apps, not just delphi. In help is written that it is dangerous to pass pointers to local variables, if we make this variable global, the code will not be thread-safe. We can safely pass a wide string,but in this case, the dll will not be compatible with other (non-Delphi) apps. scientific reports issn number

multithreading - Thread-safe in delphi - Stack Overflow

WebMar 31, 2011 · As long as there is only one thread that can write to them, then yes, they're thread safe. The real problem with thread safety is two threads trying to modify a value … WebMar 28, 2024 · Introduction. Many multi-threading or parallel programming libraries adopt a task model. In such a model, the main thread prepares a number of tasks and throws … WebMay 25, 2015 · Yes, it is unsafe to let one thread modify a string field whilst another thread can read it at the same time, – TLama May 23, 2015 at 11:35 How can I make it safe ? – Marus Gradinaru May 23, 2015 at 14:16 Add a comment 1 Answer Sorted by: 0 You have a variable shared between multiple threads, with one thread modifying the variable. praxis dr. blum bad ems

Are class properties thread safe in delphi? - Stack Overflow

delphi - Updating StringGrid from Thread - Stack Overflow

WebJan 20, 2013 · Nov 19, 2008 at 17:20. The original link appears dead - I think it was the same as this article by Martin Harvey. – Gary Walker. Feb 17 at 14:26. Add a comment. 2. You really should look at TThreadList. The methods .Add, .Remove, .Clear automatically lock the list for you. If needed, you can also lock/unlock as needed: WebSep 13, 2003 · You can build thread safe algorithms on top of the current string type, but you could not remove the overhead of built-in locking. In summary: not making … scientific reports for authorsWebJan 20, 2024 · "This is part of a class helper for TStream" - My code is also from a class helper of my own :) Though I was pretty sure it will not work with Delphi 2010 unless I change the string to AnsiString (which I just did recently). Though, I am not really interested in saving UNICOE, I admit, I will update my code (using yours) to support UNICODE. … scientific reports hearing electrons

"WebJan 29, 2024 · GetName: string; begin Result:= GetSafeValue (FName); end; function TipUser. SetName (const AValue: string); begin Result:= SetSafeValue (FName, AValue); end; So the question is, is this cleaner implementation that could exist of a multithreaded data class, is it really thread-safe? Sorry for my bad english. 😉 " - Delphi string thread safe

Delphi string thread safe

WebSep 13, 2003 · string type was made thread safe in D5. If I look at the system unit, there are comments throughout the code about thread safe reference counting. However we have been getting random access violations in our application in the system unit that implements the long string functions. _LstrAsg, _LstrClr etc. I wrote a simple test case as follows Webprocedure TThreadStringList.SetValues(const Name: string; S: string); begin LockList; try FStringList.Values[Name] := S; finally UnlockList; end; end; function …

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WebMay 14, 2013 · Use one Logging thread that dequeues the TStringList instances, writes them to the file and then frees them. This isolates the log writes from disk/network delays, removes any reliance on dodgy file-locking and will actually work reliably. Share Improve this answer Follow answered May 14, 2013 at 13:13 Martin James 24.3k 3 35 58 http://www.delphigroups.info/2/04/521955.html

WebOct 20, 2011 · The standard doesn't guarantee anything about threads. So to do anything with threads in C++, you have to rely on implementation-defined guarantees. And Then you can safely use std::string because each implementation tells you whether or not it is safe to use in a threaded environment. WebMay 19, 2011 · For the method to be multi-thread safe (i.e. re-entrant) you should provide the temporary strings as parameters... I use this trick to have valid a dynamic array of TVarData containing some AnsiString content in a class. In fact, TVarData and TVarRec both uses such non referenced pointer to strings, which can be confusing.

WebNov 19, 2013 · No, it is not thread-safe, you need to protect shared resources from concurrent access, whether that be with a critical section or interlocked API, that is your choice. AFAIK, Nothing in Delphi is thread-safe externally. Things that use threads themselves should of course be, but on the outside, you need to always consider thread … WebMar 28, 2024 · Many multi-threading or parallel programming libraries adopt a task model. In such a model, the main thread prepares a number of tasks and throws them at a pool of threads to be executed. This model works very well in most cases, but there are some cases in which it is not ideal. The game engine project is such a case.

WebAug 22, 2024 · Even in Delphi 7 string reference counting is thread safe. The relevant code is in LStrAsg from system.pas, which also in Delphi 7 uses locks for that. Your problems must have had other reasons. Note: manipulating the string variables is not thread safe out of itself, but the string instances that these variables reference are. – … scientific reports impactWebApr 7, 2024 · Viewed 141 times. 1. Basically, what I need to do is this: Show the user a "Please wait ..." form (lets call it waitForm) on top of the main form, execute http methods (get and post), and close the waitForm after I get the http response. Since the http post method communicates with a physical device, it takes a while for the response to return ... praxis dr bonke flintsbachWebSep 29, 2013 · In addition to the fact that you are posting a local variable, the TWinControl.Handle property is not thread-safe, either. You should use the TApplication.Handle property instead, or use AllocateHWnd () to create your own window. scientific reports maria beiraWebMay 4, 2024 · Regarding the string, that could be a problem if you are casting from a regular Delphi string. Delphi strings are reference counted, so by the time your message handler tries to access the string, it may have been deallocated. It might be a good idea to allocate the string yourself with StrNew. – Dangph May 3, 2024 at 5:43 Thanks for the idea. praxis dr. braun wertheimWebMay 31, 2024 · About Delphi Thread Safety Patterns. While the thread safety of a particular piece of code depends on the surrounding context and how it is used, some … scientific reports if 2017WebJul 9, 2013 · First by using the busy loop David refers to, second by causing lots of additional and unnecessary thread context switches. Get rid of the thread, create a simple thread-safe log queue, and have it post a single message to the GUI thread when the first item is added to the queue. praxis dr bock wiesbadenWebMay 18, 2024 · Before calling the thread-safe form of Format, you must populate AFormatSettings with localization information. To populate AFormatSettings with a set of … scientific reports issn no