6 files changed, 11 insertions, 552 deletions
diff --git a/pkg/flipcall/BUILD b/pkg/flipcall/BUILD
deleted file mode 100644
index c810c7946..000000000
--- a/pkg/flipcall/BUILD
+++ /dev/null
@@ -1,34 +0,0 @@
-load("//tools:defs.bzl", "go_library", "go_test")
-
-licenses(["notice"])
-
-go_library(
-    name = "flipcall",
-    srcs = [
-        "ctrl_futex.go",
-        "flipcall.go",
-        "flipcall_unsafe.go",
-        "futex_linux.go",
-        "io.go",
-        "packet_window.go",
-    ],
-    visibility = ["//visibility:public"],
-    deps = [
-        "//pkg/abi/linux",
-        "//pkg/log",
-        "//pkg/memutil",
-        "//pkg/sync",
-        "@org_golang_x_sys//unix:go_default_library",
-    ],
-)
-
-go_test(
-    name = "flipcall_test",
-    size = "small",
-    srcs = [
-        "flipcall_example_test.go",
-        "flipcall_test.go",
-    ],
-    library = ":flipcall",
-    deps = ["//pkg/sync"],
-)
diff --git a/pkg/flipcall/flipcall_example_test.go b/pkg/flipcall/flipcall_example_test.go
deleted file mode 100644
index 2e28a149a..000000000
--- a/pkg/flipcall/flipcall_example_test.go
+++ /dev/null
@@ -1,113 +0,0 @@
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package flipcall
-
-import (
-	"bytes"
-	"fmt"
-
-	"gvisor.dev/gvisor/pkg/sync"
-)
-
-func Example() {
-	const (
-		reqPrefix     = "request "
-		respPrefix    = "response "
-		count         = 3
-		maxMessageLen = len(respPrefix) + 1 // 1 digit
-	)
-
-	pwa, err := NewPacketWindowAllocator()
-	if err != nil {
-		panic(err)
-	}
-	defer pwa.Destroy()
-	pwd, err := pwa.Allocate(PacketWindowLengthForDataCap(uint32(maxMessageLen)))
-	if err != nil {
-		panic(err)
-	}
-	var clientEP Endpoint
-	if err := clientEP.Init(ClientSide, pwd); err != nil {
-		panic(err)
-	}
-	defer clientEP.Destroy()
-	var serverEP Endpoint
-	if err := serverEP.Init(ServerSide, pwd); err != nil {
-		panic(err)
-	}
-	defer serverEP.Destroy()
-
-	var serverRun sync.WaitGroup
-	serverRun.Add(1)
-	go func() {
-		defer serverRun.Done()
-		i := 0
-		var buf bytes.Buffer
-		// wait for first request
-		n, err := serverEP.RecvFirst()
-		if err != nil {
-			return
-		}
-		for {
-			// read request
-			buf.Reset()
-			buf.Write(serverEP.Data()[:n])
-			fmt.Println(buf.String())
-			// write response
-			buf.Reset()
-			fmt.Fprintf(&buf, "%s%d", respPrefix, i)
-			copy(serverEP.Data(), buf.Bytes())
-			// send response and wait for next request
-			n, err = serverEP.SendRecv(uint32(buf.Len()))
-			if err != nil {
-				return
-			}
-			i++
-		}
-	}()
-	defer func() {
-		serverEP.Shutdown()
-		serverRun.Wait()
-	}()
-
-	// establish connection as client
-	if err := clientEP.Connect(); err != nil {
-		panic(err)
-	}
-	var buf bytes.Buffer
-	for i := 0; i < count; i++ {
-		// write request
-		buf.Reset()
-		fmt.Fprintf(&buf, "%s%d", reqPrefix, i)
-		copy(clientEP.Data(), buf.Bytes())
-		// send request and wait for response
-		n, err := clientEP.SendRecv(uint32(buf.Len()))
-		if err != nil {
-			panic(err)
-		}
-		// read response
-		buf.Reset()
-		buf.Write(clientEP.Data()[:n])
-		fmt.Println(buf.String())
-	}
-
-	// Output:
-	// request 0
-	// response 0
-	// request 1
-	// response 1
-	// request 2
-	// response 2
-}
diff --git a/pkg/flipcall/flipcall_linux_state_autogen.go b/pkg/flipcall/flipcall_linux_state_autogen.go
new file mode 100644
index 000000000..ce37ac4e1
--- /dev/null
+++ b/pkg/flipcall/flipcall_linux_state_autogen.go
@@ -0,0 +1,5 @@
+// automatically generated by stateify.
+
+// +build linux
+
+package flipcall
diff --git a/pkg/flipcall/flipcall_state_autogen.go b/pkg/flipcall/flipcall_state_autogen.go
new file mode 100644
index 000000000..0e03c2a65
--- /dev/null
+++ b/pkg/flipcall/flipcall_state_autogen.go
@@ -0,0 +1,3 @@
+// automatically generated by stateify.
+
+package flipcall
diff --git a/pkg/flipcall/flipcall_test.go b/pkg/flipcall/flipcall_test.go
deleted file mode 100644
index 33fd55a44..000000000
--- a/pkg/flipcall/flipcall_test.go
+++ /dev/null
@@ -1,405 +0,0 @@
-// Copyright 2019 The gVisor Authors.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package flipcall
-
-import (
-	"runtime"
-	"testing"
-	"time"
-
-	"gvisor.dev/gvisor/pkg/sync"
-)
-
-var testPacketWindowSize = pageSize
-
-type testConnection struct {
-	pwa      PacketWindowAllocator
-	clientEP Endpoint
-	serverEP Endpoint
-}
-
-func newTestConnectionWithOptions(tb testing.TB, clientOpts, serverOpts []EndpointOption) *testConnection {
-	c := &testConnection{}
-	if err := c.pwa.Init(); err != nil {
-		tb.Fatalf("failed to create PacketWindowAllocator: %v", err)
-	}
-	pwd, err := c.pwa.Allocate(testPacketWindowSize)
-	if err != nil {
-		c.pwa.Destroy()
-		tb.Fatalf("PacketWindowAllocator.Allocate() failed: %v", err)
-	}
-	if err := c.clientEP.Init(ClientSide, pwd, clientOpts...); err != nil {
-		c.pwa.Destroy()
-		tb.Fatalf("failed to create client Endpoint: %v", err)
-	}
-	if err := c.serverEP.Init(ServerSide, pwd, serverOpts...); err != nil {
-		c.pwa.Destroy()
-		c.clientEP.Destroy()
-		tb.Fatalf("failed to create server Endpoint: %v", err)
-	}
-	return c
-}
-
-func newTestConnection(tb testing.TB) *testConnection {
-	return newTestConnectionWithOptions(tb, nil, nil)
-}
-
-func (c *testConnection) destroy() {
-	c.pwa.Destroy()
-	c.clientEP.Destroy()
-	c.serverEP.Destroy()
-}
-
-func testSendRecv(t *testing.T, c *testConnection) {
-	// This shared variable is used to confirm that synchronization between
-	// flipcall endpoints is visible to the Go race detector.
-	state := 0
-	var serverRun sync.WaitGroup
-	serverRun.Add(1)
-	go func() {
-		defer serverRun.Done()
-		t.Logf("server Endpoint waiting for packet 1")
-		if _, err := c.serverEP.RecvFirst(); err != nil {
-			t.Errorf("server Endpoint.RecvFirst() failed: %v", err)
-			return
-		}
-		state++
-		if state != 2 {
-			t.Errorf("shared state counter: got %d, wanted 2", state)
-		}
-		t.Logf("server Endpoint got packet 1, sending packet 2 and waiting for packet 3")
-		if _, err := c.serverEP.SendRecv(0); err != nil {
-			t.Errorf("server Endpoint.SendRecv() failed: %v", err)
-			return
-		}
-		state++
-		if state != 4 {
-			t.Errorf("shared state counter: got %d, wanted 4", state)
-		}
-		t.Logf("server Endpoint got packet 3")
-	}()
-	defer func() {
-		// Ensure that the server goroutine is cleaned up before
-		// c.serverEP.Destroy(), even if the test fails.
-		c.serverEP.Shutdown()
-		serverRun.Wait()
-	}()
-
-	t.Logf("client Endpoint establishing connection")
-	if err := c.clientEP.Connect(); err != nil {
-		t.Fatalf("client Endpoint.Connect() failed: %v", err)
-	}
-	state++
-	if state != 1 {
-		t.Errorf("shared state counter: got %d, wanted 1", state)
-	}
-	t.Logf("client Endpoint sending packet 1 and waiting for packet 2")
-	if _, err := c.clientEP.SendRecv(0); err != nil {
-		t.Fatalf("client Endpoint.SendRecv() failed: %v", err)
-	}
-	state++
-	if state != 3 {
-		t.Errorf("shared state counter: got %d, wanted 3", state)
-	}
-	t.Logf("client Endpoint got packet 2, sending packet 3")
-	if err := c.clientEP.SendLast(0); err != nil {
-		t.Fatalf("client Endpoint.SendLast() failed: %v", err)
-	}
-	t.Logf("waiting for server goroutine to complete")
-	serverRun.Wait()
-}
-
-func TestSendRecv(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testSendRecv(t, c)
-}
-
-func testShutdownBeforeConnect(t *testing.T, c *testConnection, remoteShutdown bool) {
-	if remoteShutdown {
-		c.serverEP.Shutdown()
-	} else {
-		c.clientEP.Shutdown()
-	}
-	if err := c.clientEP.Connect(); err == nil {
-		t.Errorf("client Endpoint.Connect() succeeded unexpectedly")
-	}
-}
-
-func TestShutdownBeforeConnectLocal(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownBeforeConnect(t, c, false)
-}
-
-func TestShutdownBeforeConnectRemote(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownBeforeConnect(t, c, true)
-}
-
-func testShutdownDuringConnect(t *testing.T, c *testConnection, remoteShutdown bool) {
-	var clientRun sync.WaitGroup
-	clientRun.Add(1)
-	go func() {
-		defer clientRun.Done()
-		if err := c.clientEP.Connect(); err == nil {
-			t.Errorf("client Endpoint.Connect() succeeded unexpectedly")
-		}
-	}()
-	time.Sleep(time.Second) // to allow c.clientEP.Connect() to block
-	if remoteShutdown {
-		c.serverEP.Shutdown()
-	} else {
-		c.clientEP.Shutdown()
-	}
-	clientRun.Wait()
-}
-
-func TestShutdownDuringConnectLocal(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringConnect(t, c, false)
-}
-
-func TestShutdownDuringConnectRemote(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringConnect(t, c, true)
-}
-
-func testShutdownBeforeRecvFirst(t *testing.T, c *testConnection, remoteShutdown bool) {
-	if remoteShutdown {
-		c.clientEP.Shutdown()
-	} else {
-		c.serverEP.Shutdown()
-	}
-	if _, err := c.serverEP.RecvFirst(); err == nil {
-		t.Errorf("server Endpoint.RecvFirst() succeeded unexpectedly")
-	}
-}
-
-func TestShutdownBeforeRecvFirstLocal(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownBeforeRecvFirst(t, c, false)
-}
-
-func TestShutdownBeforeRecvFirstRemote(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownBeforeRecvFirst(t, c, true)
-}
-
-func testShutdownDuringRecvFirstBeforeConnect(t *testing.T, c *testConnection, remoteShutdown bool) {
-	var serverRun sync.WaitGroup
-	serverRun.Add(1)
-	go func() {
-		defer serverRun.Done()
-		if _, err := c.serverEP.RecvFirst(); err == nil {
-			t.Errorf("server Endpoint.RecvFirst() succeeded unexpectedly")
-		}
-	}()
-	time.Sleep(time.Second) // to allow c.serverEP.RecvFirst() to block
-	if remoteShutdown {
-		c.clientEP.Shutdown()
-	} else {
-		c.serverEP.Shutdown()
-	}
-	serverRun.Wait()
-}
-
-func TestShutdownDuringRecvFirstBeforeConnectLocal(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringRecvFirstBeforeConnect(t, c, false)
-}
-
-func TestShutdownDuringRecvFirstBeforeConnectRemote(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringRecvFirstBeforeConnect(t, c, true)
-}
-
-func testShutdownDuringRecvFirstAfterConnect(t *testing.T, c *testConnection, remoteShutdown bool) {
-	var serverRun sync.WaitGroup
-	serverRun.Add(1)
-	go func() {
-		defer serverRun.Done()
-		if _, err := c.serverEP.RecvFirst(); err == nil {
-			t.Errorf("server Endpoint.RecvFirst() succeeded unexpectedly")
-		}
-	}()
-	defer func() {
-		// Ensure that the server goroutine is cleaned up before
-		// c.serverEP.Destroy(), even if the test fails.
-		c.serverEP.Shutdown()
-		serverRun.Wait()
-	}()
-	if err := c.clientEP.Connect(); err != nil {
-		t.Fatalf("client Endpoint.Connect() failed: %v", err)
-	}
-	if remoteShutdown {
-		c.clientEP.Shutdown()
-	} else {
-		c.serverEP.Shutdown()
-	}
-	serverRun.Wait()
-}
-
-func TestShutdownDuringRecvFirstAfterConnectLocal(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringRecvFirstAfterConnect(t, c, false)
-}
-
-func TestShutdownDuringRecvFirstAfterConnectRemote(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringRecvFirstAfterConnect(t, c, true)
-}
-
-func testShutdownDuringClientSendRecv(t *testing.T, c *testConnection, remoteShutdown bool) {
-	var serverRun sync.WaitGroup
-	serverRun.Add(1)
-	go func() {
-		defer serverRun.Done()
-		if _, err := c.serverEP.RecvFirst(); err != nil {
-			t.Errorf("server Endpoint.RecvFirst() failed: %v", err)
-		}
-		// At this point, the client must be blocked in c.clientEP.SendRecv().
-		if remoteShutdown {
-			c.serverEP.Shutdown()
-		} else {
-			c.clientEP.Shutdown()
-		}
-	}()
-	defer func() {
-		// Ensure that the server goroutine is cleaned up before
-		// c.serverEP.Destroy(), even if the test fails.
-		c.serverEP.Shutdown()
-		serverRun.Wait()
-	}()
-	if err := c.clientEP.Connect(); err != nil {
-		t.Fatalf("client Endpoint.Connect() failed: %v", err)
-	}
-	if _, err := c.clientEP.SendRecv(0); err == nil {
-		t.Errorf("client Endpoint.SendRecv() succeeded unexpectedly")
-	}
-}
-
-func TestShutdownDuringClientSendRecvLocal(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringClientSendRecv(t, c, false)
-}
-
-func TestShutdownDuringClientSendRecvRemote(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringClientSendRecv(t, c, true)
-}
-
-func testShutdownDuringServerSendRecv(t *testing.T, c *testConnection, remoteShutdown bool) {
-	var serverRun sync.WaitGroup
-	serverRun.Add(1)
-	go func() {
-		defer serverRun.Done()
-		if _, err := c.serverEP.RecvFirst(); err != nil {
-			t.Errorf("server Endpoint.RecvFirst() failed: %v", err)
-			return
-		}
-		if _, err := c.serverEP.SendRecv(0); err == nil {
-			t.Errorf("server Endpoint.SendRecv() succeeded unexpectedly")
-		}
-	}()
-	defer func() {
-		// Ensure that the server goroutine is cleaned up before
-		// c.serverEP.Destroy(), even if the test fails.
-		c.serverEP.Shutdown()
-		serverRun.Wait()
-	}()
-	if err := c.clientEP.Connect(); err != nil {
-		t.Fatalf("client Endpoint.Connect() failed: %v", err)
-	}
-	if _, err := c.clientEP.SendRecv(0); err != nil {
-		t.Fatalf("client Endpoint.SendRecv() failed: %v", err)
-	}
-	time.Sleep(time.Second) // to allow serverEP.SendRecv() to block
-	if remoteShutdown {
-		c.clientEP.Shutdown()
-	} else {
-		c.serverEP.Shutdown()
-	}
-	serverRun.Wait()
-}
-
-func TestShutdownDuringServerSendRecvLocal(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringServerSendRecv(t, c, false)
-}
-
-func TestShutdownDuringServerSendRecvRemote(t *testing.T) {
-	c := newTestConnection(t)
-	defer c.destroy()
-	testShutdownDuringServerSendRecv(t, c, true)
-}
-
-func benchmarkSendRecv(b *testing.B, c *testConnection) {
-	var serverRun sync.WaitGroup
-	serverRun.Add(1)
-	go func() {
-		defer serverRun.Done()
-		if b.N == 0 {
-			return
-		}
-		if _, err := c.serverEP.RecvFirst(); err != nil {
-			b.Errorf("server Endpoint.RecvFirst() failed: %v", err)
-			return
-		}
-		for i := 1; i < b.N; i++ {
-			if _, err := c.serverEP.SendRecv(0); err != nil {
-				b.Errorf("server Endpoint.SendRecv() failed: %v", err)
-				return
-			}
-		}
-		if err := c.serverEP.SendLast(0); err != nil {
-			b.Errorf("server Endpoint.SendLast() failed: %v", err)
-		}
-	}()
-	defer func() {
-		c.serverEP.Shutdown()
-		serverRun.Wait()
-	}()
-
-	if err := c.clientEP.Connect(); err != nil {
-		b.Fatalf("client Endpoint.Connect() failed: %v", err)
-	}
-	runtime.GC()
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		if _, err := c.clientEP.SendRecv(0); err != nil {
-			b.Fatalf("client Endpoint.SendRecv() failed: %v", err)
-		}
-	}
-	b.StopTimer()
-}
-
-func BenchmarkSendRecv(b *testing.B) {
-	c := newTestConnection(b)
-	defer c.destroy()
-	benchmarkSendRecv(b, c)
-}
diff --git a/pkg/flipcall/flipcall_unsafe_state_autogen.go b/pkg/flipcall/flipcall_unsafe_state_autogen.go
new file mode 100644
index 000000000..0e03c2a65
--- /dev/null
+++ b/pkg/flipcall/flipcall_unsafe_state_autogen.go
@@ -0,0 +1,3 @@
+// automatically generated by stateify.
+
+package flipcall