Re: [Plib-users] Multithreading in FG

[Hemalatha S. <hem...@re...>]

 =A0=0AHi,=0AThanks for your reply.=0AWe are trying to project three views(=
center,left,right) on to three projector screens.Aircraft data(lat,lon,alt =
etc) is sent to these three systems from one system through ethernet.=0A=0A=
We need to synchronize all the three views.=0A=0AWe have tried one of the m=
echanism to synchronize.......=0A=0ABefore swapping buffers, the left and r=
ight systems send done signal to the center system.Once the center system r=
ecieves done signal from both the systems, it sends release signal to both =
the system saying that it can swap the buffers.=0ABy doing this there was s=
ome improvement seen but with some delay.=0A=0A=0APlz help me to sort out t=
his problem.=0A=0AWaiting for your reply.=0ARegards,=0AHemalatha=0A=0AOn Tu=
e, 29 Aug 2006 steve wrote :=0A>I havn't given much thought to threading al=
ternate frames - the=0A>reason being that the increase in latency is not wo=
rth the savings=0A>in frame time.  I design flight simulators for a living =
- and the=0A>fight to keep latency down is at least as important as the fig=
ht to=0A>keep frame rates up.=0A>=0A>Nothing in PLIB was ever designed for =
threading - so expect a LOT=0A>of things to break!=0A>=0A>Sadly, you are on=
 your own on this one - this is not a path I'm=0A>interested in treading - =
it's a steep and twisty path and it's=0A>leading in the wrong direction.=0A=
>=0A>Good luck!=0A>=0A>Hemalatha Sharma wrote:=0A>>   Hi,=0A>>We are using =
Flightgear version 0.9.4, in which we are trying to implement multi-threadi=
ng. In one thread, processing of next frame will be done and in the other, =
rendering of the previous frame. Here, fgMainLoop() is split into two threa=
ds, all the processing before calling fgRenderFrame() in one thread, i.e. s=
ubsystem updates, input/output updates, tile manager updates,  etc., and fg=
RenderFrame() in the other thread.=0A>>=0A>>Is this the correct method of s=
plitting processing and rendering of frame data?=0A>>=0A>>We are using the =
below to create a thread:=0A>>hThread[1] =3D CreateThread(NULL,0,(LPTHREAD_=
START_ROUTINE)fgRenderFrame1,NULL,0,&dwID[1]);=0A>>       CloseHandle(hThre=
ad[1]);=0A>>=0A>>Using the above gives us stack dump error.=0A>>=0A>>Please=
 give us a solution as to how to implement threading.=0A>>Eagerly waiting f=
or your reply.=0A