Initial commit: Go 1.23 release state

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() {
+}