Delphi string thread safe

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August undefined, 2024

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

multithreading - Implement thread-safe logging - 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. 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 ... thom christopher one life to live 1996

A new mutlti-threading library for Delphi. (darkThreading)

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. 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. thom claessen

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Sending a string from anonymous thread to UI with PostMessage

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 ... 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. thom clowerWebNov 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 … ukraine offering citizenship

"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 … " - Delphi string thread safe

Delphi string thread safe

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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 … 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. – …

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Webprocedure TThreadStringList.SetValues(const Name: string; S: string); begin LockList; try FStringList.Values[Name] := S; finally UnlockList; end; end; function … 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.

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

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 …

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

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 ukraine official lanWebSep 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. ukraine offer money to russian soldiersWebJun 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. thom ciminoWebAug 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. thom christopher imagesWebDec 2, 2024 · Is OutputDebugString (PAnsiChar ('')); thread safe? I/we have been using it in threads for debugging, and it never occurred to me if I should be doing it a different way. (Delphi 7) multithreading delphi delphi-7 outputdebugstring Share Improve this question Follow edited Dec 2, 2024 at 22:49 Peter Mortensen 31k 21 105 126 ukraine offers to tow russian tankWebMar 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. thom classWebMar 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 … thom christopher imdb