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-rw-r--r--test/init1.go53
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() {
+}