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// 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
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