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Delphi string thread safe

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

Passing PChar from the Delphi DLL - Stack Overflow

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 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. fos bos in https://xcore-music.com

multithreading - Implement thread-safe logging - Stack Overflow

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. 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 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. fosbos landshut dingolfing

Thread Safe Strings - delphi - delphigroups.info

Category:multithreading - Thread-safe in delphi - Stack Overflow

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Delphi string thread safe

delphi - It is safe to change variable values of a thread from the …

WebMay 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 … 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.

Delphi string thread safe

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

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 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.

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. WebApr 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 ...

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 …

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: fosbos landshut fpaWebprocedure TThreadStringList.SetValues(const Name: string; S: string); begin LockList; try FStringList.Values[Name] := S; finally UnlockList; end; end; function … fos bos lehrplan vwlWebJul 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. fos bos lehrplan bayern