pthread_sigmask(SIG_SETMASK, &oset, nil);

	if (err != 0) {
		fatalf("pthread_create failed: %s", strerror(err));
	}
}

extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	free(v);

	crosscall1(ts.fn, setg_gcc, ts.g);
	return nil;

	pthread_sigmask(SIG_SETMASK, &oset, nil);

	if (err != 0) {
		fatalf("pthread_create failed: %s", strerror(err));
	}
}

extern void crosscall_s390x(void (*fn)(void), void *g);

static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	free(v);

	// Save g for this thread in C TLS
	setg_gcc((void*)ts.g);

	crosscall_s390x(ts.fn, (void*)ts.g);
	return nil;

	pthread_sigmask(SIG_SETMASK, &oset, nil);

	if (err != 0) {
		fatalf("pthread_create failed: %s", strerror(err));
	}
}

extern void crosscall_ppc64(void (*fn)(void), void *g);

static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	_cgo_tsan_acquire();
	free(v);
	_cgo_tsan_release();

	// Save g for this thread in C TLS
	setg_gcc((void*)ts.g);

	int tries;
	pthread_t thread;
	int r;
	struct timespec ts;

	for (tries = 0; tries < 20; tries++) {
		r = pthread_create(&thread, NULL, &sigthreadfunc, NULL);
		if (r == 0) {
			return pthread_join(thread, NULL);
		}
		if (r != EAGAIN) {
			return r;
		}
		ts.tv_sec = 0;
		ts.tv_nsec = (tries + 1) * 1000 * 1000; // Milliseconds.
		nanosleep(&ts, NULL);
	}
	return EAGAIN;

func (gs *gState[R]) blockedSyscallEnd(ts trace.Time, stack trace.Stack, ctx *traceContext) {
	name := "exit blocked syscall"
	gs.setStartCause(ts, name, trace.SyscallP, stack)

	// Emit an syscall exit instant event for the "Syscall" lane.
	ctx.Instant(traceviewer.InstantEvent{
		Name:     name,
		Ts:       ctx.elapsed(ts),
		Resource: trace.SyscallP,
		Stack:    ctx.Stack(viewerFrames(stack)),

func testServeIndexHtmlFS(t *testing.T, mode testMode) {
	const want = "index.html says hello\n"
	ts := newClientServerTest(t, mode, FileServer(Dir("."))).ts
	defer ts.Close()

	for _, path := range []string{"/testdata/", "/testdata/index.html"} {
		res, err := ts.Client().Get(ts.URL + path)
		if err != nil {
			t.Fatal(err)
		}
		b, err := io.ReadAll(res.Body)
		if err != nil {

	pthread_sigmask(SIG_SETMASK, &oset, nil);

	if (err != 0) {
		fatalf("pthread_create failed: %s", strerror(err));
	}
}

extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
static void*
threadentry(void *v)
{
	ThreadStart ts;
	stack_t ss;

	ts = *(ThreadStart*)v;
	free(v);

	// On NetBSD, a new thread inherits the signal stack of the

	pthread_sigmask(SIG_SETMASK, &oset, nil);

	if (err != 0) {
		fatalf("pthread_create failed: %s", strerror(err));
	}
}

extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
static void*
threadentry(void *v)
{
	ThreadStart ts;

	ts = *(ThreadStart*)v;
	_cgo_tsan_acquire();
	free(v);
	_cgo_tsan_release();

	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
	return nil;

			ts := newClientServerTest(t, mode, h).ts
			go proxy(t)
			c := ts.Client()
			c.Transport.(*Transport).Proxy = ProxyURL(pu)
			r, err := c.Head(ts.URL)
			if err != nil {
				t.Fatal(err)
			}
			if r.Header.Get(sentinelHeader) != sentinelValue {
				t.Errorf("Failed to retrieve sentinel value")
			}
			got := <-ch
			ts.Close()
			tsu, err := url.Parse(ts.URL)

	}

	switch mode {
	case http1Mode:
		cst.ts.Start()
	case https1Mode:
		cst.ts.StartTLS()
	case http2Mode:
		ExportHttp2ConfigureServer(cst.ts.Config, nil)
		cst.ts.TLS = cst.ts.Config.TLSConfig
		cst.ts.StartTLS()
	default:
		t.Fatalf("unknown test mode %v", mode)
	}
	cst.c = cst.ts.Client()
	cst.tr = cst.c.Transport.(*Transport)
	if mode == http2Mode {