PPAPI: Purposely leak ProxyLock, fix shutdown race

ppapi/shared_impl/proxy_lock_unittest.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <string>
+
+#include "base/bind.h"
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "base/memory/ref_counted.h"
+#include "ppapi/shared_impl/proxy_lock.h"
+#include "ppapi/shared_impl/test_globals.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace ppapi {
+
+namespace {
+
+bool expect_to_be_locked = false;
+void CheckLockState() {
+  if (expect_to_be_locked) {
+    ProxyLock::AssertAcquired();
+  } else {
+    // If we expect to be unlocked, try to lock. We rely on the checking inside
+    // base::Lock that prevents recursive locking.
+    ProxyAutoLock lock;
+  }
+}
+
+int called_num = 0;
+
+class CheckLockStateInDestructor
+    : public base::RefCounted<CheckLockStateInDestructor> {
+ public:
+  CheckLockStateInDestructor() {}
+  void Method() {
+    ++called_num;
+  }
+ private:
+  friend class base::RefCounted<CheckLockStateInDestructor>;
+  ~CheckLockStateInDestructor() {
+    CheckLockState();
+  }
+  DISALLOW_COPY_AND_ASSIGN(CheckLockStateInDestructor);
+};
+
+void TestCallback_0() {
+  CheckLockState();
+  ++called_num;
+}
+
+void TestCallback_1(int p1) {
+  CheckLockState();
+  ++called_num;
+}
+
+void TestCallback_2(int p1, const std::string& p2) {
+  CheckLockState();
+  ++called_num;
+}
+
+struct Param {};
+void TestCallback_3(int p1, const std::string& p2, Param p3) {
+  CheckLockState();
+  ++called_num;
+}
+
+}  // namespace
+
+TEST(PpapiProxyLockTest, Locking) {
+  TestGlobals globals;
+  base::Lock lock;
+  globals.set_proxy_lock(&lock);
+  expect_to_be_locked = true;
+
+  base::Callback<void()> cb0;
+  {
+    ProxyAutoLock lock;
+    cb0 = RunWhileLocked(base::Bind(TestCallback_0));
+  }
+  cb0.Run();
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+
+  {
+    ProxyAutoLock lock;
+    cb0 = RunWhileLocked(base::Bind(TestCallback_1, 123));
+  }
+  cb0.Run();
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+
+  {
+    ProxyAutoLock lock;
+    scoped_refptr<CheckLockStateInDestructor> object =
+        new CheckLockStateInDestructor();
+    cb0 = RunWhileLocked(
+              base::Bind(&CheckLockStateInDestructor::Method,
+                         object));
+    // Note after this scope, the Callback owns the only reference.
+  }
+  cb0.Run();
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+
+  base::Callback<void(int)> cb1;
+  {
+    ProxyAutoLock lock;
+    cb1 = RunWhileLocked(base::Bind(TestCallback_1));
+  }
+  cb1.Run(123);
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+
+  base::Callback<void(int, const std::string&)> cb2;
+  {
+    ProxyAutoLock lock;
+    cb2 = RunWhileLocked(base::Bind(TestCallback_2));
+  }
+  cb2.Run(123, std::string("yo"));
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+
+  base::Callback<void(int, const std::string&, Param)> cb3;
+  {
+    ProxyAutoLock lock;
+    cb3 = RunWhileLocked(base::Bind(TestCallback_3));
+  }
+  cb3.Run(123, std::string("yo"), Param());
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+
+  base::Callback<void(const std::string&)> cb1_string;
+  {
+    ProxyAutoLock lock;
+    cb1_string = RunWhileLocked(base::Bind(TestCallback_2, 123));
+  }
+  cb1_string.Run(std::string("yo"));
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+
+  {
+    ProxyAutoLock lock;
+    cb0 = RunWhileLocked(base::Bind(TestCallback_2, 123, std::string("yo")));
+  }
+  cb0.Run();
+  ASSERT_EQ(1, called_num);
+  called_num = 0;
+}
+
+TEST(PpapiProxyLockTest, Unlocking) {
+  TestGlobals globals;
+  base::Lock lock;
+  globals.set_proxy_lock(&lock);
+  expect_to_be_locked = false;
+  // These calls should all try to _unlock_, so we must be locked before
+  // entering them.
+  ProxyAutoLock auto_lock;
+
+  {
+    CallWhileUnlocked(TestCallback_0);
+    ASSERT_EQ(1, called_num);
+    called_num = 0;
+  } {
+    CallWhileUnlocked(TestCallback_1, 123);
+    ASSERT_EQ(1, called_num);
+    called_num = 0;
+  } {
+    // TODO(dmichael): Make const-ref arguments work properly with type
+    // deduction.
+    CallWhileUnlocked<void, int, const std::string&>(
+        TestCallback_2, 123, std::string("yo"));
+    ASSERT_EQ(1, called_num);
+    called_num = 0;
+  } {
+    base::Callback<void()> callback(base::Bind(TestCallback_0));
+    CallWhileUnlocked(callback);
+    ASSERT_EQ(1, called_num);
+    called_num = 0;
+  }
+}
+
+}  // namespace ppapi