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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/chan/select2.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/chan/select2.go')
-rw-r--r-- | gcc-4.9/gcc/testsuite/go.test/test/chan/select2.go | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/go.test/test/chan/select2.go b/gcc-4.9/gcc/testsuite/go.test/test/chan/select2.go new file mode 100644 index 000000000..ccf9dab81 --- /dev/null +++ b/gcc-4.9/gcc/testsuite/go.test/test/chan/select2.go @@ -0,0 +1,54 @@ +// run + +// Copyright 2010 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 that selects do not consume undue memory. + +package main + +import "runtime" + +func sender(c chan int, n int) { + for i := 0; i < n; i++ { + c <- 1 + } +} + +func receiver(c, dummy chan int, n int) { + for i := 0; i < n; i++ { + select { + case <-c: + // nothing + case <-dummy: + panic("dummy") + } + } +} + +func main() { + runtime.MemProfileRate = 0 + + c := make(chan int) + dummy := make(chan int) + + // warm up + go sender(c, 100000) + receiver(c, dummy, 100000) + runtime.GC() + memstats := new(runtime.MemStats) + runtime.ReadMemStats(memstats) + alloc := memstats.Alloc + + // second time shouldn't increase footprint by much + go sender(c, 100000) + receiver(c, dummy, 100000) + runtime.GC() + runtime.ReadMemStats(memstats) + + // Be careful to avoid wraparound. + if memstats.Alloc > alloc && memstats.Alloc-alloc > 1.1e5 { + println("BUG: too much memory for 100,000 selects:", memstats.Alloc-alloc) + } +} |