BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Thread::WaitFor() issue Goto page 1, 2, 3 ... 30, 31, 32  Next          BorlandTalk.com Forum Index -> C++ Builder (Language C++) View previous topic :: View next topic   Author Message server Guest Posted: Fri Feb 17, 2006 9:03 am    Post subject: Thread::WaitFor() issue message unavailable Back to top Kiwi Guest Posted: Fri Feb 17, 2006 9:03 am    Post subject: Re: Thread::WaitFor() issue Hi Remy, I think I tried a form of your example below and found that with the code in the main form thread->Terminate(); // This didn't allow the thread to get to the Execute() function thread->WaitFor(); and if I changed the order to thread->WaitFor(); // Then the main program waited here for the thread to finish thread->Terminate(); // so using the thread is a waste of time. What am I missing? I have a main program and several threads, say, threadA, threadB, and threadC. The main program calls the threads and what I want is for threadB to wait for threadA to finish (if threadA is running). How would you recommend I use the thread->WaitFor() in this case. Thanks, Roger "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> wrote in message news:43d7cc2a$1 (AT) newsgroups (DOT) borland.com... Quote: "Leonid R" <waxhall (AT) yahoo (DOT) com> wrote in message news:43d7977f$1 (AT) newsgroups (DOT) borland.com... Whenever I'm trying to use Thread::WaitFor() function I'm receiving "Thread Error: The handle is invalid (6)" exception message box. I am assuming that you are using BCB 6 or higher, is that right? BCB 6 introduced that bug into WaitFor() (see QC #6080 for details). The issue only happens when you have the thread's FreeOnTerminate property set to true, since the thread's handle gets destroyed while WaitFor() is still waiting on it. The reason you get the exception is because Borland changed the way WaitFor() handles errors in BCB 6. Earlier versions did not throw the exception, WaitFor() existed normally instead. In short, do NOT use FreeOnTerminate with WaitFor(). FreeOnTerminate is best used only when you want ot start the thread and forget about it, not keeping track of it at all. But if you need to wait on the thread, then you should free the thread manually after the waiting is finished, ie: void __fastcall TMainForm::Button1Click(TObject *Sender) { if( !thread ) thread = new TTestThread(false); } void __fastcall TMainForm::Button2Click(TObject *Sender) { if( thread ) { thread->Terminate(); thread->WaitFor(); delete thread; thread = NULL; } } Gambit Back to top Ed Mulroy Guest Posted: Mon Mar 27, 2006 2:03 pm    Post subject: Re: Need help - Can't program today Thanks for the comments. Catch by reference: A great comment that solves possible problems. Same for the remark about 'explicit'. Much thanks!!! There is no need to overload []. It is not the function of the class to wrap an array type. It is to hide the altered behavior of the current C++ new vs the way C++' new of 17 years ago worked so that an old program could be handled with a current compiler. I only put the delete [] call into the denstructor to make things easier so that I could erase them rather than convert the "delete" calls to "delete []". Yes, I know a new char[0] will not throw an exception and will provide a unique address. As you can see from the comment in the code, in this case it should fail. The #include <string> is why it did not complain about the missing definition of bad_alloc. .. Ed Quote: From: Alisdair Meredith alisdair.meredith@no-spam-splease (AT) uk (DOT) renaultf1.com Subject: Re: Need help - Can't program today Date: Sunday, March 26, 2006 10:52 PM Ed Mulroy wrote: Quote: Comments invited. #include <cstring> // for NULL template <typename T> class MyNew { public: MyNew(unsigned howmany = 1) : tsize(howmany) { try { buf = (howmany) ? new T[howmany] : NULL; } catch (bad_alloc) { buf = NULL; } } ~MyNew() { delete [] buf; } operator T* () { return buf; } const MyNew & operator = (const MyNew &) const { return *this; } unsigned AllocSize() const { return tsize; } private: T *buf; unsigned tsize; MyNew(const MyNew &); // unimplemented }; This copy assignment operator is just asking for trouble. MyNew< int > a( 5 ); MyNew< int > b( 10 ); a = b; int * pa = a; int * pb = b; if( pa != pb ) { std::cout << "I am SURE I assigned a = b" << endl; } That said, an assignment operator that is const?! That should have been the real clue, in hindsight - this class does something strange. It is unusual to have something assignable but not copyable anyway. MyNew< int > a( 10 ); MyNew< int > b = a; // error on this line b = a; // but no on this I mild efficiency/correctness issue would be to catch std::bad_alloc by (const) reference. In theory the new operator can throw an exception derived from std::bad_alloc, and catch-by-value will miss it. std::bad_alloc is declared in header <stdexcept> - so you have more than std namespace problems if this compiles in your test harness. I presume you know that new int[0] is well formed in C++ and will return a unique pointer each time it is called? i.e. there is no need for the workaround for the size 0 array, although you may choose to do so for other reasons beyond the scope of this example. It seems odd to wrap an array type, but not overload operator[]. You should probably make the constructor explicit, unless you want the following code to compile: MyNew< int > a = 10; Back to top hank Guest Posted: Thu Apr 27, 2006 8:03 am    Post subject: Re: Adding Languages to a Project(BDS2006) Quote: Hi all: Borland Help say that: You can add languages to your project by using the Satellite Assembly Wizard (.NET) or Resource DLL Wizard (Win32). For each language that you add, the wizard generates a resource module project in your project group. Each resource module project is given an extension based on the language¡¦s locale. To add a language to a project 1.. Save and build your project. 2.. With your project open in the IDE, choose Project->Languages->Add. The wizard is displayed. But I can't find the Project->Languages item , Why ? Please help. Back to top Hans Galema Guest Posted: Fri Apr 28, 2006 9:03 am    Post subject: Re: Invalid value of struct tm's 'tm_isdst'-element (when tr MR wrote: Quote: 2nd April 2006, 2:59 (=> is_now_summertime==false) 2nd April 2006, 3:00 (=> is_now_summertime==true) you meant: tm->tm_isdst. <help for localtime> localtime accepts the address of a value returned by time and returns a pointer to the structure of type tm containing the time elements. It corrects for the time zone and possible daylight saving time. The global long variable _timezone contains the difference in seconds between GMT and local standard time (in PST, _timezone is 8 x 60 x 60). The global variable _daylight is used to tell the RTL's functions (mktime & localtime) whether they should take daylight saving time into account if it runs into a date that would normally fall into that category. It is set to 1 if the daylight savings time conversion should be applied. These values are set by tzset, not by the user program directly. </help> Did you check _daylight ? Hans. Back to top Guest Posted: Sun Apr 30, 2006 5:03 am    Post subject: Re: Invalid value of struct tm's 'tm_isdst'-element (when tr Thanks for the answer: Quote: Did you check _daylight ? Yes, I did. It is 1. I found out the problem lies in the function int _isDST (unsigned hour, unsigned yday, unsigned month, unsigned year) located inside the file timefunc.c. A commentary inside it says /* Month is either April or October. Up through 1986, the starting * day for DST is the last Sunday in April; after that it is * the first Sunday in April. The last day of DST is the last Sunday * in October. */ This seems not to be correct: According to another source in the internet: since 1996 summertime in Germany begins at the last sunday in march 2:00 MEZ and ends at the last sunday in october at 3:00 MESZ. Checking this under windows, this seems correct (at least in the recent years):: E.g. setting current date to 26th march 2006 and time to 1:59:59, 2 secs later windows displays time as 3:00:01. ? How can I check in which country the current computer is located in, to be able to calculate the summer-time individually (or displaying a message, that the summertime-calculation is not available for this country)? (I suppose _timezone would be helpful, but not enough, because some nearby countries handle summertime differently too). Thank you, Michael Back to top vavan Guest Posted: Tue May 02, 2006 6:03 am    Post subject: Re: Invalid value of struct tm's 'tm_isdst'-element (when tr On Sun, 30 Apr 2006 05:45:45 +0200, <MR> wrote: Quote: This seems not to be correct: there is a long-standing bug in bcb rtl related to DST handling. recently I sent fixed sources to borland engineer currently assigned to rtl tasks. I hope borland finally will include those fixes. I can send them to you if you show your email. you'll need to rebuild rtl though. I personally couldn't rebuilt bds rtl yet (make failed) -- Vladimir Ulchenko aka vavan Back to top AlexB Guest Posted: Tue May 30, 2006 12:22 pm    Post subject: Re: How to avoid this Clayton Arends wrote: Quote: Do you have a QC link or other reference to point me to? At your service: 19753 Alex. Back to top yu xing Guest Posted: Tue May 30, 2006 12:45 pm    Post subject: Re: Codeguard Error your code causes memory leak! you should use // delete []Columns; Back to top Clayton Arends Guest Posted: Tue May 30, 2006 1:05 pm    Post subject: Re: How to avoid this *gulp* Thanks for that scary bedtime story. Now I'm going to go to sleep and have nightmares over all of the places I've used this notation. This might explain some tiny memory leaks in my apps that I've never been able to quite figure out. Now, to satisfy my limited scope requirement: { int p; while ((p = string.Pos("$")) != 0) { } } -or even uglier/scarier- for (int p; (p = string.Pos("$")) != 0; ) { } Thanks for bringing this to my attention, - Clayton Back to top Ed Mulroy Guest Posted: Tue May 30, 2006 5:19 pm    Post subject: Re: How to avoid this Quote: Now, to satisfy my limited scope requirement: { int p; while ((p = string.Pos("$")) != 0) { } } FWIW: I did things like that for years, especially in older C code. One day I decided to investigate it further, examining the generated code. I found that the compiler is fairly good at limiting the scope. 'p' would normally be a register althoug a memory location might be used depending upon how involved the code in the loop is. After the loop it was used for something else (if needed). Your scope-limiting concerns mainly address your own coding. Judging from the amount of time you've been posting on here and the content of your posts, I doubt that is much of a problem for you. However if someone else gets to modify your code then I take that back :-) .. Ed Quote: Clayton Arends wrote in message news:447bfca2$1 (AT) newsgroups (DOT) borland.com... *gulp* Thanks for that scary bedtime story. Now I'm going to go to sleep and have nightmares over all of the places I've used this notation. This might explain some tiny memory leaks in my apps that I've never been able to quite figure out. Now, to satisfy my limited scope requirement: { int p; while ((p = string.Pos("$")) != 0) { } } -or even uglier/scarier- for (int p; (p = string.Pos("$")) != 0; ) { } Thanks for bringing this to my attention, Back to top Clayton Arends Guest Posted: Tue May 30, 2006 9:09 pm    Post subject: Re: How to avoid this "Ed Mulroy" <dont_email_me (AT) bitbuc (DOT) ket> wrote in message news:447c3867$1 (AT) newsgroups (DOT) borland.com... Quote: Your scope-limiting concerns mainly address your own coding. Quite true. My main concern in cases like this is in clarifying the intent of my code. Quote: Judging from the amount of time you've been posting on here and the content of your posts, I doubt that is much of a problem for you. Thanks for that. - Clayton Back to top Bob Gonder Guest Posted: Tue May 30, 2006 10:00 pm    Post subject: Re: puttext()-problems, if DOS-Box is larger than dos-box-sc <MR> wrote: Quote: How can I get the (x,y) coordinate to use for puttext(), if I want to write to let's say the current cursor-position? I think you need to apply winleft and wintop to curx and cury. Also, your rectangle might need clipping by winright and winbottom Quote: struct text_info TextInfoStartup; gettextinfo(&TextInfoStartup); CurrentTextAttrib=TextInfoStartup.attribute; CurrentCursorX=TextInfoStartup.curx; CurrentCursorY=TextInfoStartup.cury; CurrentCursorX=TextInfoStartup.curx - TextInfoStartup.winleft; CurrentCursorY=TextInfoStartup.cury - TextInfoStartup.wintop; Quote: Perhaps there is an altternative for puttext()!? Yes, the Win Console functions. GetConsoleScreenBufferInfo() SetConsoleCursorPosition() WriteConsole() And many more. Back to top Thomas Maeder [TeamB] Guest Posted: Wed May 31, 2006 1:10 am    Post subject: Re: Codeguard Error yu xing <mail2yzx (AT) 126 (DOT) com> writes: Quote: your code causes memory leak! Maybe. More exactly, his code has undefined behavior. A memory leak is just one possible outcome. Quote: you should use // delete []Columns; Correct. Back to top AlexB Guest Posted: Wed May 31, 2006 8:35 am    Post subject: Re: How to avoid this Clayton Arends wrote: Quote: Now I'm going to go to sleep and have nightmares ... And it's only one thing among others. How often do you browse through the list of QC reports about critical bugs in codegeneration? Any normal programmer would go crazy with it. But borland crew sleep "the sleep of the just" for years. Take a look on this NG thread: "Q: I would like to know what are the most famous applications developed under BCB platform 5 or 6? A: Keith Chuvala of the United Space Alliance (and a former TeamB member) was a speaker at DevCon this week. One of his sessions demonstrated the functionality of his team's "WorldMap" application, which is developed exclusively in BCB for use by NASA on its space shuttles and the International Space Station (ISS) for tracking real-time orbital postitioning of shuttles, the IIS, satellites." Astronauts are adventurous guys... Alex. 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