Re: [Lazarus] TTimer woes (newbie)
On 03/31/2014 07:51 PM, Flávio Etrusco wrote: TTimer in Windows (and the basic timer support in Windows ) is implemented using window messages and you're not allowing the app to process messages inside your loop. This necessity is not limited to Windows nor to TTimer. Any Object Pascal Event handler (hence most code done in normal projects) is driven by the Project's Event Queue (which in Windows in turn is driven by Windows messages). In fact using Application.ProcessMessages in a loop is a workaround that is necessary when you really need a long winding loop in one of the (main Thread-) - Events) calculating something. It is a lot better style to do short events, whenever possible (maybe doing the long winding stuff in a TThread). Infinite (polling) loops in fact are (close to) forbidden, as they eat up CPU cycles that can better be used for other activities in the project or in any other program running on that PC. In fact Bob is not doing this (eating up CPU Cycles), but he uses wait(), which only hampers it's own project. This also usually is (close to) forbidden in the main thread, as the GUI will stop working while the main thread waits. Thus he should either use a TTimer instead of waiting and continue the work to be done in a newly entered Timer Event, or execute the code that includes the wait() in a TThread. -Michael -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] TTimer woes (newbie)
On 01/04/2014 09:44, Michael Schnell wrote: In fact Bob is not doing this (eating up CPU Cycles), but he uses wait(), which only hampers it's own project. Actually Bob's wait uses his own TTimer-based code, and is not well designed. As Flavio wrote, he would be best to replace all his waits with a Sleep, and remove his timer altogether. Howard -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] Better implementation of GetTickcount using clock_gettime
I use GetTickCount a lot to keep track of timeouts. On windows, it is guaranteed to be monotonic, so my usual if GetTickCount-StartTimeTimeout then.. works fine (yes, even when the time wraps around, provided StartTime is defined as DWORD and Timeout is smaller than a DWORD, of course I could use GetTickCount64 but usually the 32bits version is enough). For unix the implementation uses fpgettimeofday but that's not monotonic, so it could break the above code. For linux a more accurate implementation could be function GetTickCount64: QWord; var tp: timespec; begin clock_gettime(CLOCK_MONOTONIC, @tp); Result := (Int64(tp.tv_sec) * 1000) + (tp.tv_nsec div 100); end; And I say linux because CLOCK_MONOTONIC is only defined there in fpc, though it should be available even in other systems: http://pubs.opengroup.org/onlinepubs/9699919799/functions/clock_getres.html Bye -- Luca Olivetti Wetron Automation Technology http://www.wetron.es Tel. +34 935883004 Fax +34 935883007 -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Better implementation of GetTickcount using clock_gettime
On 04/01/2014 12:20 PM, Luca Olivetti wrote: For linux a more accurate implementation could be function GetTickCount64: QWord; var tp: timespec; begin clock_gettime(CLOCK_MONOTONIC, @tp); Result := (Int64(tp.tv_sec) * 1000) + (tp.tv_nsec div 100); end; And I say linux because CLOCK_MONOTONIC is only defined there in fpc, though it should be available even in other systems: CLOCK_MONOTONIC is available only for kernels = 2.6.26. zeljko -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Better implementation of GetTickcount using clock_gettime
On Tue, Apr 01, 2014 at 12:45:54PM +0200, zeljko wrote: On 04/01/2014 12:20 PM, Luca Olivetti wrote: For linux a more accurate implementation could be function GetTickCount64: QWord; var tp: timespec; begin clock_gettime(CLOCK_MONOTONIC, @tp); Result := (Int64(tp.tv_sec) * 1000) + (tp.tv_nsec div 100); end; And I say linux because CLOCK_MONOTONIC is only defined there in fpc, though it should be available even in other systems: CLOCK_MONOTONIC is available only for kernels = 2.6.26. No, it's been around since before 2.6. Henry -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Better implementation of GetTickcount using clock_gettime
On 04/01/2014 01:57 PM, Henry Vermaak wrote: On Tue, Apr 01, 2014 at 12:45:54PM +0200, zeljko wrote: On 04/01/2014 12:20 PM, Luca Olivetti wrote: For linux a more accurate implementation could be function GetTickCount64: QWord; var tp: timespec; begin clock_gettime(CLOCK_MONOTONIC, @tp); Result := (Int64(tp.tv_sec) * 1000) + (tp.tv_nsec div 100); end; And I say linux because CLOCK_MONOTONIC is only defined there in fpc, though it should be available even in other systems: CLOCK_MONOTONIC is available only for kernels = 2.6.26. No, it's been around since before 2.6. You're right. I've been on CLOCK_MONOTONIC_RAW which is available since 2.6.28 actually so my complete information was wrong ;) zeljko -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] TTimer woes (newbie)
On 03/31/2014 01:51 PM, Flávio Etrusco wrote: ... I guess simply changing your loop to: +++ repeat Application.ProcessMessages; until not timer1.enabled; +++ should make it work. That loop will work, but the CPU usage will be 100% and the CPU will run warm and the battery life on a laptop will be bad. I'd normally add a Sleep(10) in the loop to avoid those problems. Best regards, Paul www.TurboControl.com -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] LazOpenGLContext won't install
I am using version 1.2~rc2+dfsg-1 and get the following error when trying to install the LazOpenGLContext 0.0.1 package then Save and Rebuild IDE: (1,1) Fatal: Can not find unit lazopenglcontext used by Lazarus. Check if package LazOpenGLContext is in the dependencies. What steps are required to install the lazopenglcontext package? Or is there a more up-to-date method of getting 3D display in a Lazarus application? Thanks, Anthony -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] LazOpenGLContext won't install
On Tue, 1 Apr 2014 12:27:41 -0400 Anthony Tekatch anth...@unihedron.com wrote: I am using version 1.2~rc2+dfsg-1 We don't provide such a version. Where did you get that? How did you install Lazarus? Do you use gtk1 or gtk2? What fpc version do you use? and get the following error when trying to install the LazOpenGLContext 0.0.1 package then Save and Rebuild IDE: (1,1) Fatal: Can not find unit lazopenglcontext used by Lazarus. Check if package LazOpenGLContext is in the dependencies. What steps are required to install the lazopenglcontext package? Or is there a more up-to-date method of getting 3D display in a Lazarus application? It works fine for me under Linux/gtk2. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] LazOpenGLContext won't install
On Tue, 1 Apr 2014 18:46:26 +0200, Mattias Gaertner nc-gaert...@netcologne.de wrote: On Tue, 1 Apr 2014 12:27:41 -0400 Anthony Tekatch anth...@unihedron.com wrote: I am using version 1.2~rc2+dfsg-1 We don't provide such a version. Where did you get that? How did you install Lazarus? From the Debian testing repository. Do you use gtk1 or gtk2? gtk2 What fpc version do you use? 2.6.2 and get the following error when trying to install the LazOpenGLContext 0.0.1 package then Save and Rebuild IDE: (1,1) Fatal: Can not find unit lazopenglcontext used by Lazarus. Check if package LazOpenGLContext is in the dependencies. What steps are required to install the lazopenglcontext package? Or is there a more up-to-date method of getting 3D display in a Lazarus application? It works fine for me under Linux/gtk2. Thank you for your reply. What version/source of Lazarus do you suggest that I use (which has a working LazOpenGLContext package)? Thanks, Anthony -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Better implementation of GetTickcount using clock_gettime
On Tue, 01 Apr 2014 12:20:53 +0200 Luca Olivetti l...@wetron.es wrote: [...] function GetTickCount64: QWord; var tp: timespec; begin clock_gettime(CLOCK_MONOTONIC, @tp); Result := (Int64(tp.tv_sec) * 1000) + (tp.tv_nsec div 100); end; [...] Thanks. GetTickCount64 now uses it on Linux. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Better implementation of GetTickcount using clock_gettime
El 01/04/14 20:03, Mattias Gaertner ha escrit: On Tue, 01 Apr 2014 12:20:53 +0200 Luca Olivetti l...@wetron.es wrote: [...] function GetTickCount64: QWord; var tp: timespec; begin clock_gettime(CLOCK_MONOTONIC, @tp); Result := (Int64(tp.tv_sec) * 1000) + (tp.tv_nsec div 100); end; [...] Thanks. GetTickCount64 now uses it on Linux. Wow, that was fast. Thank you. Bye -- Luca Olivetti Wetron Automation Technology http://www.wetron.es Tel. +34 935883004 Fax +34 935883007 -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] LazOpenGLContext won't install
On Tue, 1 Apr 2014 13:57:57 -0400 Anthony Tekatch anth...@unihedron.com wrote: [...] What version/source of Lazarus do you suggest that I use (which has a working LazOpenGLContext package)? See here: http://wiki.lazarus.freepascal.org/Getting_Lazarus Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] LazOpenGLContext won't install
On Tue, 1 Apr 2014 20:10:03 +0200, Mattias Gaertner nc-gaert...@netcologne.de wrote: On Tue, 1 Apr 2014 13:57:57 -0400 Anthony Tekatch anth...@unihedron.com wrote: What version/source of Lazarus do you suggest that I use (which has a working LazOpenGLContext package)? See here: http://wiki.lazarus.freepascal.org/Getting_Lazarus That did the trick. I installed from the Debian binaries there. Thanks! Anthony -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Prevent visual updates
That is a great idea Mattias! a timer with 1 as interval is fast enough for responce application and slow enough to avoid flickering Thanks! -Αρχικό μήνυμα- From: Mattias Gaertner Sent: Sunday, March 30, 2014 11:17 PM To: lazarus@lists.lazarus.freepascal.org Subject: Re: [Lazarus] Prevent visual updates On Sun, 30 Mar 2014 23:11:41 +0300 Chris Crori cror...@yahoo.com wrote: Doublebuffered did not solve my problem i have a panel that i make visible depending on a flag. in a unique situation, this flag must change 2 times, so it's my bad, not the LCL's if i could disable the LCL messages in that unique situation, it would be very helpfull, but if i can't do that, i m sure i ll find another way Hide/Show the panel on Idle or via a Timer. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Prevent visual updates
On 01/04/2014 20:43, Chris Crori wrote: That is a great idea Mattias! a timer with 1 as interval is fast enough for responce application and slow enough to avoid flickering Another very good way to do this, is using Application.QueueAsync -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Prevent visual updates
QueueAsync. Thread safe and multiplatform... I will look into that Martin, seems like a solution to many problems Thank you! -Αρχικό μήνυμα- From: Martin Frb Sent: Tuesday, April 01, 2014 11:12 PM To: Lazarus mailing list Subject: Re: [Lazarus] Prevent visual updates On 01/04/2014 20:43, Chris Crori wrote: That is a great idea Mattias! a timer with 1 as interval is fast enough for responce application and slow enough to avoid flickering Another very good way to do this, is using Application.QueueAsync -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Prevent visual updates
QueueAsync works great! Martin you rock! ;) -Αρχικό μήνυμα- From: Chris Crori Sent: Wednesday, April 02, 2014 1:07 AM To: Lazarus mailing list Subject: Re: [Lazarus] Prevent visual updates QueueAsync. Thread safe and multiplatform... I will look into that Martin, seems like a solution to many problems Thank you! -Αρχικό μήνυμα- From: Martin Frb Sent: Tuesday, April 01, 2014 11:12 PM To: Lazarus mailing list Subject: Re: [Lazarus] Prevent visual updates On 01/04/2014 20:43, Chris Crori wrote: That is a great idea Mattias! a timer with 1 as interval is fast enough for responce application and slow enough to avoid flickering Another very good way to do this, is using Application.QueueAsync -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
