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Diffstat (limited to '')
-rw-r--r-- | test/init1.go | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/test/init1.go b/test/init1.go new file mode 100644 index 0000000..0803dce --- /dev/null +++ b/test/init1.go @@ -0,0 +1,53 @@ +// run + +// Copyright 2011 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 goroutines and garbage collection run during init. + +package main + +import "runtime" + +var x []byte + +func init() { + c := make(chan int) + go send(c) + <-c + + const N = 1000 + const MB = 1 << 20 + b := make([]byte, MB) + for i := range b { + b[i] = byte(i%10 + '0') + } + s := string(b) + + memstats := new(runtime.MemStats) + runtime.ReadMemStats(memstats) + sys, numGC := memstats.Sys, memstats.NumGC + + // Generate 1,000 MB of garbage, only retaining 1 MB total. + for i := 0; i < N; i++ { + x = []byte(s) + } + + // Verify that the garbage collector ran by seeing if we + // allocated fewer than N*MB bytes from the system. + runtime.ReadMemStats(memstats) + sys1, numGC1 := memstats.Sys, memstats.NumGC + if sys1-sys >= N*MB || numGC1 == numGC { + println("allocated 1000 chunks of", MB, "and used ", sys1-sys, "memory") + println("numGC went", numGC, "to", numGC1) + panic("init1") + } +} + +func send(c chan int) { + c <- 1 +} + +func main() { +} |