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diff --git a/net/disk_cache/mapped_file_unittest.cc b/net/disk_cache/mapped_file_unittest.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "base/file_util.h"
+#include "net/disk_cache/disk_cache_test_util.h"
+#include "net/disk_cache/mapped_file.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+int g_cache_tests_max_id;
+volatile int g_cache_tests_received;
+volatile bool g_cache_tests_error;
+
+// Implementation of FileIOCallback for the tests.
+class FileCallbackTest: public disk_cache::FileIOCallback {
+ public:
+ explicit FileCallbackTest(int id) : id_(id), reuse_(0) {}
+ explicit FileCallbackTest(int id, bool reuse)
+ : id_(id), reuse_(reuse_ ? 0 : 1) {}
+ ~FileCallbackTest() {}
+
+ virtual void OnFileIOComplete(int bytes_copied);
+ private:
+ int id_;
+ int reuse_;
+};
+
+void FileCallbackTest::OnFileIOComplete(int bytes_copied) {
+ if (id_ > g_cache_tests_max_id) {
+ NOTREACHED();
+ g_cache_tests_error = true;
+ } else if (reuse_) {
+ DCHECK(1 == reuse_);
+ if (2 == reuse_)
+ g_cache_tests_error = true;
+ reuse_++;
+ }
+
+ g_cache_tests_received++;
+}
+
+// Wait up to 2 secs without callbacks, or until we receive expected callbacks.
+void WaitForCallbacks(int expected) {
+ if (!expected)
+ return;
+
+ int iterations = 0;
+ int last = 0;
+ while (iterations < 40) {
+ SleepEx(50, TRUE);
+ if (expected == g_cache_tests_received)
+ return;
+ if (last == g_cache_tests_received)
+ iterations++;
+ else
+ iterations = 0;
+ }
+}
+
+} // namespace
+
+TEST(DiskCacheTest, MappedFile_SyncIO) {
+ std::wstring filename = GetCachePath();
+ file_util::AppendToPath(&filename, L"a_test");
+ scoped_refptr<disk_cache::MappedFile> file(new disk_cache::MappedFile);
+ ASSERT_TRUE(CreateCacheTestFile(filename.c_str()));
+ ASSERT_TRUE(file->Init(filename, 8192));
+
+ char buffer1[20];
+ char buffer2[20];
+ CacheTestFillBuffer(buffer1, sizeof(buffer1), false);
+ strcpy_s(buffer1, "the data");
+ EXPECT_TRUE(file->Write(buffer1, sizeof(buffer1), 8192));
+ EXPECT_TRUE(file->Read(buffer2, sizeof(buffer2), 8192));
+ EXPECT_STREQ(buffer1, buffer2);
+}
+
+TEST(DiskCacheTest, MappedFile_AsyncIO) {
+ std::wstring filename = GetCachePath();
+ file_util::AppendToPath(&filename, L"a_test");
+ scoped_refptr<disk_cache::MappedFile> file(new disk_cache::MappedFile);
+ ASSERT_TRUE(CreateCacheTestFile(filename.c_str()));
+ ASSERT_TRUE(file->Init(filename, 8192));
+
+ FileCallbackTest callback(1);
+ g_cache_tests_error = false;
+ g_cache_tests_max_id = 0;
+ g_cache_tests_received = 0;
+
+ char buffer1[20];
+ char buffer2[20];
+ CacheTestFillBuffer(buffer1, sizeof(buffer1), false);
+ strcpy_s(buffer1, "the data");
+ bool completed;
+ EXPECT_TRUE(file->Write(buffer1, sizeof(buffer1), 1024 * 1024, &callback,
+ &completed));
+ int expected = completed ? 0 : 1;
+
+ g_cache_tests_max_id = 1;
+ WaitForCallbacks(expected);
+
+ EXPECT_TRUE(file->Read(buffer2, sizeof(buffer2), 1024 * 1024, &callback,
+ &completed));
+ if (!completed)
+ expected++;
+
+ WaitForCallbacks(expected);
+
+ EXPECT_EQ(expected, g_cache_tests_received);
+ EXPECT_FALSE(g_cache_tests_error);
+ EXPECT_STREQ(buffer1, buffer2);
+}