On Sun, 2007-10-21 at 19:48 -0700, Erick Tryzelaar wrote: > Right now schannel's read is a proc which means you have to explicitly > pass in a variable that is assigned the value read from the channel. > I think this was how things were done before generators.
Yes, you can try an experiment with read in a generator. It should be lifted out and inlined away. If the generator remains as a closure it may fail, because the closure of a generator is still a functional closure, not a procedural closures, so it cannot yield and thus can't issue a service call. HOWEVER this does raise an interesting point (thanks!!). IF I manage to get the new garbage collector stuff working, with a conservative stack scan, it may be possible to enter the 'user space operating system' (the driver) with a callback instead of a yield. The only constraint is that the current fthread has to be continued, because the suspension is INSIDE a call and there is no way to swap machine stacks. This means that a call to do a garbage collection would be 'callbackable' to invent a mouthful. However channel I/O cannot be: you can't 'unschedule' an fthread which is going to continue to execute when the callback returns. However we DO have code in the compiler to completely eliminate functions now, replacing them all with procedures. So, EXCEPT for callbacks driven from C code, it should be possible to even do channel I/O in functions, by procedurizing them. the trick is to procedurize functions that have to be and not others, because the machine stack remains much faster than the heap for allocations. A procedurized version of Ackermann's function runs marginally slower than C. (The functional version using the stack is almost twice as fast as C). -- John Skaller <skaller at users dot sf dot net> Felix, successor to C++: http://felix.sf.net ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Felix-language mailing list Felix-language@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/felix-language
