mirror of
https://github.com/golang/go
synced 2024-11-22 11:24:49 -07:00
72 lines
2.2 KiB
Go
72 lines
2.2 KiB
Go
/*
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
|
|
* Neither the name of "The Computer Language Benchmarks Game" nor the
|
|
name of "The Computer Language Shootout Benchmarks" nor the names of
|
|
its contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/* The Computer Language Benchmarks Game
|
|
* http://shootout.alioth.debian.org/
|
|
*
|
|
* contributed by The Go Authors.
|
|
*/
|
|
|
|
package main
|
|
|
|
import (
|
|
"flag";
|
|
"fmt";
|
|
"os";
|
|
)
|
|
|
|
var n = flag.Int("n", 1000, "how many passes")
|
|
|
|
const Nthread = 503
|
|
|
|
func f(i int, in <-chan int, out chan<- int) {
|
|
for {
|
|
n := <-in;
|
|
if n == 0 {
|
|
fmt.Printf("%d\n", i);
|
|
os.Exit(0);
|
|
}
|
|
out <- n - 1
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
flag.Parse();
|
|
|
|
one := make(chan int); // will be input to thread 1
|
|
var in, out chan int = nil, one;
|
|
for i := 1; i <= Nthread-1; i++ {
|
|
in, out = out, make(chan int);
|
|
go f(i, in, out);
|
|
}
|
|
go f(Nthread, out, one);
|
|
one <- *n;
|
|
<-make(chan int); // hang until ring completes
|
|
}
|