Re: Bound Threads

[Sven Panne]

I just skimmed over Wolfgang's PDF and things look quite reasonable.
Just to make sure I have understood everything correctly: To make
HOpenGL work in the presence of a threaded RTS, the only places which
need a change are the stub factories for GLUT callbacks, where a "bound"
attribute is required now.

What about the foreign import of glutMainLoop (the main native dispatcher
for GLUT, which calls the Haskell callbacks mentioned above when an event
occurs and blocks the rest of the time)? It is currently "safe", is this
OK? Or should it be "threadsafe"? I must admit that I can't remember the
exact semantic distinction between those two attributes anymore... :-}

Cheers,
   S.
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Re: Bound Threads

[Wolfgang Thaller]

Sven Panne wrote:

Just to make sure I have understood everything correctly: To make
HOpenGL work in the presence of a threaded RTS, the only places which
need a change are the stub factories for GLUT callbacks, where a 
"bound"
attribute is required now.
Correct.

What about the foreign import of glutMainLoop (the main native 
dispatcher
for GLUT, which calls the Haskell callbacks mentioned above when an 
event
occurs and blocks the rest of the time)? It is currently "safe", is 
this
OK? Or should it be "threadsafe"?
It should probably be "threadsafe", just in case somebody wants to do 
some (non-OpenGL) work in the background.

I must admit that I can't remember the
exact semantic distinction between those two attributes anymore... :-}
The problem is, nobody does... the original implementation didn't work 
in all cases. The original implementation made "safe" calls block all 
other haskell threads in some cases, and crashed in other cases. 
"Threadsafe" means that calling the foreign import shouldn't block or 
otherwise disturb other haskell threads. "Safe" means... well... almost 
nobody seems to know, and still fewer people agree on it.
In the current "HEAD", there is no difference between threadsafe and 
safe. If someone comes up with a clear specification of why and how 
"safe" should be different from threadsafe, things might change again.
This issue is (I think/hope) entirely orthogonal to the Bound Threads 
proposal.

Cheers,

Wolfgang

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