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author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/testsuite/go.test/test/sieve.go | |
parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/testsuite/go.test/test/sieve.go')
-rw-r--r-- | gcc-4.9/gcc/testsuite/go.test/test/sieve.go | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/go.test/test/sieve.go b/gcc-4.9/gcc/testsuite/go.test/test/sieve.go new file mode 100644 index 000000000..0cd120c54 --- /dev/null +++ b/gcc-4.9/gcc/testsuite/go.test/test/sieve.go @@ -0,0 +1,45 @@ +// build + +// Copyright 2009 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Test basic concurrency: the classic prime sieve. +// Do not run - loops forever. + +package main + +// Send the sequence 2, 3, 4, ... to channel 'ch'. +func Generate(ch chan<- int) { + for i := 2; ; i++ { + ch <- i // Send 'i' to channel 'ch'. + } +} + +// Copy the values from channel 'in' to channel 'out', +// removing those divisible by 'prime'. +func Filter(in <-chan int, out chan<- int, prime int) { + for { + i := <-in // Receive value of new variable 'i' from 'in'. + if i%prime != 0 { + out <- i // Send 'i' to channel 'out'. + } + } +} + +// The prime sieve: Daisy-chain Filter processes together. +func Sieve() { + ch := make(chan int) // Create a new channel. + go Generate(ch) // Start Generate() as a subprocess. + for { + prime := <-ch + print(prime, "\n") + ch1 := make(chan int) + go Filter(ch, ch1, prime) + ch = ch1 + } +} + +func main() { + Sieve() +} |