On Saturday, 11 February 2012 at 01:31:29 UTC, Ali Çehreli wrote:
Sorry for the double-post; I have asked the same question on
D.learn earlier but I think this is more of a question to this
forum.
Tested on Ubuntu 11.10 64-bit dmd.
The following program gets stuck during the writeln() call.
- Note that the foo() call alone works fine.
- Also note that the program works fine when there is no
writeln() call nor foo() call. All elements get processed in
that case and the results are ignored.
Am I using taskPool.map incorrectly or is this a bug? Can you
help identify where the problem may be? How is writeln() using
the range differently than foo() to cause this behavior?
import std.stdio;
import std.parallelism;
import core.thread;
int func(int i)
{
writeln("processing ", i);
return i;
}
void main()
{
auto results = taskPool.map!func([1,2,3,4,5,6,7,8], 2);
writeln(results); // <-- Gets stuck HERE
foo(results); // this works fine
}
void foo(R)(R range)
{
for ( ; !range.empty; range.popFront()) {
writeln(range.front);
}
}
Thank you,
Ali
For what I see, maybe that's because it's a "non-random access
ranges". So to access "results", you need access from it's
aggregate...
try this inside your main:
foreach(int r; results)
writeln(r);
// foo(results); // this works fin
