blob: 3edee975810e504c8423bc98c176c9a793b2b7da [file] [log] [blame]
package cgotest
/*
void callback(void *f);
void callGoFoo(void) {
extern void goFoo(void);
goFoo();
}
*/
import "C"
import (
"runtime"
"testing"
"unsafe"
)
// nestedCall calls into C, back into Go, and finally to f.
func nestedCall(f func()) {
// NOTE: Depends on representation of f.
// callback(x) calls goCallback(x)
C.callback(*(*unsafe.Pointer)(unsafe.Pointer(&f)))
}
//export goCallback
func goCallback(p unsafe.Pointer) {
(*(*func())(unsafe.Pointer(&p)))()
}
func testCallback(t *testing.T) {
var x = false
nestedCall(func() { x = true })
if !x {
t.Fatal("nestedCall did not call func")
}
}
func testCallbackGC(t *testing.T) {
nestedCall(runtime.GC)
}
func lockedOSThread() bool // in runtime.c
func testCallbackPanic(t *testing.T) {
// Make sure panic during callback unwinds properly.
if lockedOSThread() {
t.Fatal("locked OS thread on entry to TestCallbackPanic")
}
defer func() {
s := recover()
if s == nil {
t.Fatal("did not panic")
}
if s.(string) != "callback panic" {
t.Fatal("wrong panic:", s)
}
if lockedOSThread() {
t.Fatal("locked OS thread on exit from TestCallbackPanic")
}
}()
nestedCall(func() { panic("callback panic") })
panic("nestedCall returned")
}
func testCallbackPanicLoop(t *testing.T) {
// Make sure we don't blow out m->g0 stack.
for i := 0; i < 100000; i++ {
TestCallbackPanic(t)
}
}
func testCallbackPanicLocked(t *testing.T) {
runtime.LockOSThread()
defer runtime.UnlockOSThread()
if !lockedOSThread() {
t.Fatal("runtime.LockOSThread didn't")
}
defer func() {
s := recover()
if s == nil {
t.Fatal("did not panic")
}
if s.(string) != "callback panic" {
t.Fatal("wrong panic:", s)
}
if !lockedOSThread() {
t.Fatal("lost lock on OS thread after panic")
}
}()
nestedCall(func() { panic("callback panic") })
panic("nestedCall returned")
}
// Callback with zero arguments used to make the stack misaligned,
// which broke the garbage collector and other things.
func testZeroArgCallback(t *testing.T) {
defer func() {
s := recover()
if s != nil {
t.Fatal("panic during callback:", s)
}
}()
C.callGoFoo()
}
//export goFoo
func goFoo() {
x := 1
for i := 0; i < 10000; i++ {
// variadic call mallocs + writes to
variadic(x, x, x)
if x != 1 {
panic("bad x")
}
}
}
func variadic(x ...interface{}) {}
func testBlocking(t *testing.T) {
c := make(chan int)
go func() {
for i := 0; i < 10; i++ {
c <- <-c
}
}()
nestedCall(func() {
for i := 0; i < 10; i++ {
c <- i
if j := <-c; j != i {
t.Errorf("out of sync %d != %d", j, i)
}
}
})
}