2024 Delphi string thread safe

Delphi string thread safe

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August undefined, 2024

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 … 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.

multithreading - Implement thread-safe logging - Stack Overflow

WebFeb 19, 2015 · Add that string pointer into a global or parent-global TList or TThreadList depending on whether you have thread-safe ways of accessing the TList or not. Depending on when you want to sort I would sort the list either as soon as the thread changes its string in its string pointer or do the sort after many threads' string pointers have changed ... 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 … how many episodes does monster musume have

Multi thread safe event in Delphi - Stack Overflow

Webprocedure TThreadStringList.SetValues(const Name: string; S: string); begin LockList; try FStringList.Values[Name] := S; finally UnlockList; end; end; function … 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: http://www.delphigroups.info/2/04/521955.html high variability 意味

In Delphi, is OutputDebugString thread safe? - Stack Overflow

delphi - How to handle Log in a Threaded manner - Stack Overflow

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. WebJul 24, 2015 · Writing a thread safe code in Delphi involves the basic care you would have in any other language, which means to deal with race conditions. A race condition … high variability abaWebJan 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. … how many episodes does naruto have shippuden

"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. – … " - Delphi string thread safe

Delphi string thread safe

Creating/Using FileStream Thread Safe - Stack Overflow

WebMay 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. http://www.delphigroups.info/2/04/521955.html

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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 … WebFeb 20, 2024 · Yes, then FPass will be guaranteed to point to a long string heap object of refcount 1. – Andreas Rejbrand Feb 20, 2024 at 13:27 2 If there is no writing after multiple threads start accessing the data, then reading is thread safe. But your question would be more clear if you have added some code.

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. WebSep 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.

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. 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

WebJul 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.

WebMay 18, 2024 · Before calling the thread-safe form of Format, you must populate AFormatSettings with localization information. To populate AFormatSettings with a set of … high variability examplesWebMay 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. high variabilityWebJan 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. 😉 high variability histogramWebAug 16, 2024 · To add to Barry's answer: It is definitely thread-safe if the string that got passed came from a local variable inside the callers scope. In that case that local variable will hold a valid reference and the only way (assuming just valid pascal code, no fiddling around in asm) for that local variable to be changed is if your call returns. high vapor pressure and boiling pointWebJun 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. how many episodes does naruto have in totalWebAug 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. high variability ctg high variable