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revision 1.400 by kryde, Fri Jul 18 01:28:38 2003 UTC revision 1.401 by kryde, Thu Jul 24 00:14:59 2003 UTC
# Line 283  to the distribution" above. Line 283  to the distribution" above.
283  Futures are like promises, but begun immediately in a new thread.  See  Futures are like promises, but begun immediately in a new thread.  See
284  the "Futures" section in the reference manual.  the "Futures" section in the reference manual.
285    
286  ** New syntax: parallel FORM ...  ** New threading functions: parallel, letpar, par-map, and friends
287    
288  Compute the results of FORM ... in parallel (in a separate thread for  These are convenient ways to run calculations in parallel in new
289  each form) and return them as multiple values.  threads.  See "Parallel forms" in the manual for details.
   
 ** New syntax: letpar ((VAR EXP) ...) BODYFORM ...  
   
 Like 'let' but evaluates the binding expressions EXP ... in parallel.  
   
 ** New functions: par-map, par-for-each PROC ARGLIST ...  
   
 Like 'map' and 'for-each' but evaluate the procedure PROC in a  
 separate thread for each (set of) argument(s).  All applications are  
 guaranteed to be completed before the procedure returns.  
   
 ** New functions: n-par-map, n-par-for-each N PROC ARGLIST ...  
   
 Like 'par-map' and 'par-for-each' but evaluate the procedure PROC in N  
 threads.  This is useful when PROC uses large amounts of resources  
 and/or the argument list(s) is/are long so that one thread per (set  
 of) argument(s) would consume too much system resources.  On a  
 dual-CPU system, N = 4 would often be a good choice.  
   
 ** New function: n-for-each-par-map N S-PROC P-PROC ARGLIST ...  
   
 Using N parallel processes, apply S-PROC in serial order to each  
 result of applying P-PROC to each set of arguments in the argument  
 lists ARGLIST ...  
   
 Like a composition of 'for-each' and 'n-par-map', but allows S-PROC to  
 start processing while the results of P-PROC are being produced.  
290    
291  ** Fair mutexes and condition variables  ** Fair mutexes and condition variables
292    

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