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// Copyright 2015 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.
//go:build !plan9 && !windows
// +build !plan9,!windows
package main
/*
#include <pthread.h>
void go_callback();
static void *thr(void *arg) {
go_callback();
return 0;
}
static void foo() {
pthread_t th;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, 256 << 10);
pthread_create(&th, &attr, thr, 0);
pthread_join(th, 0);
}
*/
import "C"
import (
"fmt"
"os"
"runtime"
"sync/atomic"
_ "unsafe" // for go:linkname
)
func init() {
register("CgoCallbackGC", CgoCallbackGC)
}
//export go_callback
func go_callback() {
if e := extraMInUse.Load(); e == 0 {
fmt.Printf("in callback extraMInUse got %d want >0\n", e)
os.Exit(1)
}
runtime.GC()
grow()
runtime.GC()
}
var cnt int
func grow() {
x := 10000
sum := 0
if grow1(&x, &sum) == 0 {
panic("bad")
}
}
func grow1(x, sum *int) int {
if *x == 0 {
return *sum + 1
}
*x--
sum1 := *sum + *x
return grow1(x, &sum1)
}
func CgoCallbackGC() {
P := 100
if os.Getenv("RUNTIME_TEST_SHORT") != "" {
P = 10
}
if e := extraMInUse.Load(); e != 0 {
fmt.Printf("before testing extraMInUse got %d want 0\n", e)
os.Exit(1)
}
done := make(chan bool)
// allocate a bunch of stack frames and spray them with pointers
for i := 0; i < P; i++ {
go func() {
grow()
done <- true
}()
}
for i := 0; i < P; i++ {
<-done
}
// now give these stack frames to cgo callbacks
for i := 0; i < P; i++ {
go func() {
C.foo()
done <- true
}()
}
for i := 0; i < P; i++ {
<-done
}
if e := extraMInUse.Load(); e != 0 {
fmt.Printf("after testing extraMInUse got %d want 0\n", e)
os.Exit(1)
}
fmt.Printf("OK\n")
}
//go:linkname extraMInUse runtime.extraMInUse
var extraMInUse atomic.Uint32