Re: [osg-users] Stack of actions todo
El Jueves 15 Mayo 2008ES 11:00:41 Vincent Bourdier escribió: Hi all, After a look on the net and in the archive, I think nobody did it before, but I prefer ask to earn time : I need to do something like a stack or a list of actions to apply on the scenegraph (FIFO stack if possible). I've a thread which will create the actions to make, and I need to do theses actions on the render loop, stopping the thread during the flush of the stack. Do OSG implement something like this ? Thanks, Regards, Vincent. Hi Vicent, how would it be different from an update callback? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stack of actions todo
Hi Alberto I just need to control when I flush the stack, to synchonise with the threads. A Callback would flush the stack (and so modify the graph) at the same time of the callbacks which traverse the graph... It is dangerous. I would stop the threads, flush my stack, and notify the threads to continue... 2008/5/15 Alberto Luaces [EMAIL PROTECTED]: El Jueves 15 Mayo 2008ES 11:00:41 Vincent Bourdier escribió: Hi all, After a look on the net and in the archive, I think nobody did it before, but I prefer ask to earn time : I need to do something like a stack or a list of actions to apply on the scenegraph (FIFO stack if possible). I've a thread which will create the actions to make, and I need to do theses actions on the render loop, stopping the thread during the flush of the stack. Do OSG implement something like this ? Thanks, Regards, Vincent. Hi Vicent, how would it be different from an update callback? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stack of actions todo
Hi Robert, You said then you'll need to place a barrier in frame loop to half the frame loop thread I'm not sure to understand how I can do it, and what do you mean by half the frame loop ?? Moreover, I need a stack, that will be re-used for an other way, so I think I'll keep this idea. I suppose the STL is the best way to do it and OSG not implement something more useful for my problem. Thanks, Regards, Vincent. 2008/5/15 Robert Osfield [EMAIL PROTECTED]: Hi Vincent, The OSG designed around the model of single threaded update, multi-thread cull-draw. If you have others threads beyond the main frame loop thread that is want to do updates then you'll need to place a barrier in frame loop to half the frame loop thread while you operations run, then release the barrier when you operations are complete for that frame. Robert. On Thu, May 15, 2008 at 10:39 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: Hi Alberto I just need to control when I flush the stack, to synchonise with the threads. A Callback would flush the stack (and so modify the graph) at the same time of the callbacks which traverse the graph... It is dangerous. I would stop the threads, flush my stack, and notify the threads to continue... 2008/5/15 Alberto Luaces [EMAIL PROTECTED]: El Jueves 15 Mayo 2008ES 11:00:41 Vincent Bourdier escribió: Hi all, After a look on the net and in the archive, I think nobody did it before, but I prefer ask to earn time : I need to do something like a stack or a list of actions to apply on the scenegraph (FIFO stack if possible). I've a thread which will create the actions to make, and I need to do theses actions on the render loop, stopping the thread during the flush of the stack. Do OSG implement something like this ? Thanks, Regards, Vincent. Hi Vicent, how would it be different from an update callback? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stack of actions todo
Hi Vincent, How much threading have you done before, i.e. how confident are you about using threads, blocks and barriers? I asks this as I doubt no how much to assume. Robert. On Thu, May 15, 2008 at 11:25 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: Hi Robert, You said then you'll need to place a barrier in frame loop to half the frame loop thread I'm not sure to understand how I can do it, and what do you mean by half the frame loop ?? Moreover, I need a stack, that will be re-used for an other way, so I think I'll keep this idea. I suppose the STL is the best way to do it and OSG not implement something more useful for my problem. Thanks, Regards, Vincent. 2008/5/15 Robert Osfield [EMAIL PROTECTED]: Hi Vincent, The OSG designed around the model of single threaded update, multi-thread cull-draw. If you have others threads beyond the main frame loop thread that is want to do updates then you'll need to place a barrier in frame loop to half the frame loop thread while you operations run, then release the barrier when you operations are complete for that frame. Robert. On Thu, May 15, 2008 at 10:39 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: Hi Alberto I just need to control when I flush the stack, to synchonise with the threads. A Callback would flush the stack (and so modify the graph) at the same time of the callbacks which traverse the graph... It is dangerous. I would stop the threads, flush my stack, and notify the threads to continue... 2008/5/15 Alberto Luaces [EMAIL PROTECTED]: El Jueves 15 Mayo 2008ES 11:00:41 Vincent Bourdier escribió: Hi all, After a look on the net and in the archive, I think nobody did it before, but I prefer ask to earn time : I need to do something like a stack or a list of actions to apply on the scenegraph (FIFO stack if possible). I've a thread which will create the actions to make, and I need to do theses actions on the render loop, stopping the thread during the flush of the stack. Do OSG implement something like this ? Thanks, Regards, Vincent. Hi Vicent, how would it be different from an update callback? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stack of actions todo
I'm not very familiar with threads, and no more with OpenThreads... but I learn quickly if I understand. But if I need to spend a week to understant and set it, I'd better make my stack I think... Vincent 2008/5/15 Robert Osfield [EMAIL PROTECTED]: Hi Vincent, How much threading have you done before, i.e. how confident are you about using threads, blocks and barriers? I asks this as I doubt no how much to assume. Robert. On Thu, May 15, 2008 at 11:25 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: Hi Robert, You said then you'll need to place a barrier in frame loop to half the frame loop thread I'm not sure to understand how I can do it, and what do you mean by half the frame loop ?? Moreover, I need a stack, that will be re-used for an other way, so I think I'll keep this idea. I suppose the STL is the best way to do it and OSG not implement something more useful for my problem. Thanks, Regards, Vincent. 2008/5/15 Robert Osfield [EMAIL PROTECTED]: Hi Vincent, The OSG designed around the model of single threaded update, multi-thread cull-draw. If you have others threads beyond the main frame loop thread that is want to do updates then you'll need to place a barrier in frame loop to half the frame loop thread while you operations run, then release the barrier when you operations are complete for that frame. Robert. On Thu, May 15, 2008 at 10:39 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: Hi Alberto I just need to control when I flush the stack, to synchonise with the threads. A Callback would flush the stack (and so modify the graph) at the same time of the callbacks which traverse the graph... It is dangerous. I would stop the threads, flush my stack, and notify the threads to continue... 2008/5/15 Alberto Luaces [EMAIL PROTECTED]: El Jueves 15 Mayo 2008ES 11:00:41 Vincent Bourdier escribió: Hi all, After a look on the net and in the archive, I think nobody did it before, but I prefer ask to earn time : I need to do something like a stack or a list of actions to apply on the scenegraph (FIFO stack if possible). I've a thread which will create the actions to make, and I need to do theses actions on the render loop, stopping the thread during the flush of the stack. Do OSG implement something like this ? Thanks, Regards, Vincent. Hi Vicent, how would it be different from an update callback? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stack of actions todo
Hi Vincent, The OSG designed around the model of single threaded update, multi-thread cull-draw. If you have others threads beyond the main frame loop thread that is want to do updates then you'll need to place a barrier in frame loop to half the frame loop thread while you operations run, then release the barrier when you operations are complete for that frame. Robert. On Thu, May 15, 2008 at 10:39 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: Hi Alberto I just need to control when I flush the stack, to synchonise with the threads. A Callback would flush the stack (and so modify the graph) at the same time of the callbacks which traverse the graph... It is dangerous. I would stop the threads, flush my stack, and notify the threads to continue... 2008/5/15 Alberto Luaces [EMAIL PROTECTED]: El Jueves 15 Mayo 2008ES 11:00:41 Vincent Bourdier escribió: Hi all, After a look on the net and in the archive, I think nobody did it before, but I prefer ask to earn time : I need to do something like a stack or a list of actions to apply on the scenegraph (FIFO stack if possible). I've a thread which will create the actions to make, and I need to do theses actions on the render loop, stopping the thread during the flush of the stack. Do OSG implement something like this ? Thanks, Regards, Vincent. Hi Vicent, how would it be different from an update callback? ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stack of actions todo
On Thu, May 15, 2008 at 11:43 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: I'm not very familiar with threads, and no more with OpenThreads... but I learn quickly if I understand. But if I need to spend a week to understant and set it, I'd better make my stack I think... Have a read through docs on pthreads as OpenThreads is maps pthreads functionality quite well, basically providing a C++ wrapper for the underlying thread implementation and a few help classes on top. The core OSG has a few further higher level help classes like osg::Operation and osg::OperationThread that you could use. A basic grounding with threading in general will help you understand the issues. Also do searches through the OSG itself to see how it uses various OpenThreads classes. Don't expect threading to come easy though, it's can be a hard topic the first time you start working on it, so invest the time now you'll benefit from this for the rest of your career. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Stack of actions todo
Thanks for your help, I'll try to look at it in details. Regards, Vincent. 2008/5/15 Robert Osfield [EMAIL PROTECTED]: On Thu, May 15, 2008 at 11:43 AM, Vincent Bourdier [EMAIL PROTECTED] wrote: I'm not very familiar with threads, and no more with OpenThreads... but I learn quickly if I understand. But if I need to spend a week to understant and set it, I'd better make my stack I think... Have a read through docs on pthreads as OpenThreads is maps pthreads functionality quite well, basically providing a C++ wrapper for the underlying thread implementation and a few help classes on top. The core OSG has a few further higher level help classes like osg::Operation and osg::OperationThread that you could use. A basic grounding with threading in general will help you understand the issues. Also do searches through the OSG itself to see how it uses various OpenThreads classes. Don't expect threading to come easy though, it's can be a hard topic the first time you start working on it, so invest the time now you'll benefit from this for the rest of your career. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
