0
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src/base/shared_memory_unittest.cc
brettw@google.com 176aa48371 Add Terminate() to the Process object, have RenderProcessHost use this to avoid some more Windows specific code.
Move Process and SharedMemory into the base namespace (most changes).

Review URL: http://codereview.chromium.org/10895

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@5446 0039d316-1c4b-4281-b951-d872f2087c98
2008-11-14 03:25:15 +00:00

185 lines
5.6 KiB
C++

// Copyright (c) 2006-2008 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 "base/basictypes.h"
#include "base/platform_thread.h"
#include "base/shared_memory.h"
#include "testing/gtest/include/gtest/gtest.h"
static const int kNumThreads = 5;
namespace base {
namespace {
// Each thread will open the shared memory. Each thread will take a different 4
// byte int pointer, and keep changing it, with some small pauses in between.
// Verify that each thread's value in the shared memory is always correct.
class MultipleThreadMain : public PlatformThread::Delegate {
public:
explicit MultipleThreadMain(int16 id) : id_(id) {}
~MultipleThreadMain() {}
// PlatformThread::Delegate interface.
void ThreadMain() {
const int kDataSize = 1024;
std::wstring test_name = L"SharedMemoryOpenThreadTest";
SharedMemory memory;
bool rv = memory.Create(test_name, false, true, kDataSize);
EXPECT_TRUE(rv);
rv = memory.Map(kDataSize);
EXPECT_TRUE(rv);
int *ptr = static_cast<int*>(memory.memory()) + id_;
EXPECT_EQ(*ptr, 0);
for (int idx = 0; idx < 100; idx++) {
*ptr = idx;
PlatformThread::Sleep(1); // Short wait.
EXPECT_EQ(*ptr, idx);
}
memory.Close();
}
private:
int16 id_;
DISALLOW_COPY_AND_ASSIGN(MultipleThreadMain);
};
#if defined(OS_WIN)
// Each thread will open the shared memory. Each thread will take the memory,
// and keep changing it while trying to lock it, with some small pauses in
// between. Verify that each thread's value in the shared memory is always
// correct.
class MultipleLockThread : public PlatformThread::Delegate {
public:
explicit MultipleLockThread(int id) : id_(id) {}
~MultipleLockThread() {}
// PlatformThread::Delegate interface.
void ThreadMain() {
const int kDataSize = sizeof(int);
SharedMemoryHandle handle = NULL;
{
SharedMemory memory1;
EXPECT_TRUE(memory1.Create(L"SharedMemoryMultipleLockThreadTest",
false, true, kDataSize));
EXPECT_TRUE(memory1.ShareToProcess(GetCurrentProcess(), &handle));
// TODO(paulg): Implement this once we have a posix version of
// SharedMemory::ShareToProcess.
EXPECT_TRUE(true);
}
SharedMemory memory2(handle, false);
EXPECT_TRUE(memory2.Map(kDataSize));
volatile int* const ptr = static_cast<int*>(memory2.memory());
for (int idx = 0; idx < 20; idx++) {
memory2.Lock();
int i = (id_ << 16) + idx;
*ptr = i;
PlatformThread::Sleep(1); // Short wait.
EXPECT_EQ(*ptr, i);
memory2.Unlock();
}
memory2.Close();
}
private:
int id_;
DISALLOW_COPY_AND_ASSIGN(MultipleLockThread);
};
#endif
} // namespace
TEST(SharedMemoryTest, OpenClose) {
const int kDataSize = 1024;
std::wstring test_name = L"SharedMemoryOpenCloseTest";
// Open two handles to a memory segment, confirm that they are mapped
// separately yet point to the same space.
SharedMemory memory1;
bool rv = memory1.Open(test_name, false);
EXPECT_FALSE(rv);
rv = memory1.Create(test_name, false, false, kDataSize);
EXPECT_TRUE(rv);
rv = memory1.Map(kDataSize);
EXPECT_TRUE(rv);
SharedMemory memory2;
rv = memory2.Open(test_name, false);
EXPECT_TRUE(rv);
rv = memory2.Map(kDataSize);
EXPECT_TRUE(rv);
EXPECT_NE(memory1.memory(), memory2.memory()); // Compare the pointers.
// Make sure we don't segfault. (it actually happened!)
ASSERT_NE(memory1.memory(), static_cast<void*>(NULL));
ASSERT_NE(memory2.memory(), static_cast<void*>(NULL));
// Write data to the first memory segment, verify contents of second.
memset(memory1.memory(), '1', kDataSize);
EXPECT_EQ(memcmp(memory1.memory(), memory2.memory(), kDataSize), 0);
// Close the first memory segment, and verify the second has the right data.
memory1.Close();
char *start_ptr = static_cast<char *>(memory2.memory());
char *end_ptr = start_ptr + kDataSize;
for (char* ptr = start_ptr; ptr < end_ptr; ptr++)
EXPECT_EQ(*ptr, '1');
// Close the second memory segment.
memory2.Close();
}
#if defined(OS_WIN)
// Create a set of 5 threads to each open a shared memory segment and write to
// it. Verify that they are always reading/writing consistent data.
TEST(SharedMemoryTest, MultipleThreads) {
PlatformThreadHandle thread_handles[kNumThreads];
MultipleThreadMain* thread_delegates[kNumThreads];
// Spawn the threads.
for (int16 index = 0; index < kNumThreads; index++) {
PlatformThreadHandle pth;
thread_delegates[index] = new MultipleThreadMain(index);
EXPECT_TRUE(PlatformThread::Create(0, thread_delegates[index], &pth));
thread_handles[index] = pth;
}
// Wait for the threads to finish.
for (int index = 0; index < kNumThreads; index++) {
PlatformThread::Join(thread_handles[index]);
delete thread_delegates[index];
}
}
// Create a set of threads to each open a shared memory segment and write to it
// with the lock held. Verify that they are always reading/writing consistent
// data.
TEST(SharedMemoryTest, Lock) {
PlatformThreadHandle thread_handles[kNumThreads];
MultipleLockThread* thread_delegates[kNumThreads];
// Spawn the threads.
for (int index = 0; index < kNumThreads; ++index) {
PlatformThreadHandle pth;
thread_delegates[index] = new MultipleLockThread(index);
EXPECT_TRUE(PlatformThread::Create(0, thread_delegates[index], &pth));
thread_handles[index] = pth;
}
// Wait for the threads to finish.
for (int index = 0; index < kNumThreads; ++index) {
PlatformThread::Join(thread_handles[index]);
delete thread_delegates[index];
}
}
#endif
} // namespace base