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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