125 lines
4.0 KiB
C++
125 lines
4.0 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#if defined(OS_WIN)
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#include <windows.h>
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#include <process.h>
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#endif
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#include "base/threading/simple_thread.h"
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#include "base/threading/thread_local_storage.h"
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#include "testing/gtest/include/gtest/gtest.h"
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#if defined(OS_WIN)
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// Ignore warnings about ptr->int conversions that we use when
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// storing ints into ThreadLocalStorage.
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#pragma warning(disable : 4311 4312)
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#endif
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namespace base {
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namespace {
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const int kInitialTlsValue = 0x5555;
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const int kFinalTlsValue = 0x7777;
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// How many times must a destructor be called before we really are done.
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const int kNumberDestructorCallRepetitions = 3;
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static ThreadLocalStorage::StaticSlot tls_slot = TLS_INITIALIZER;
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class ThreadLocalStorageRunner : public DelegateSimpleThread::Delegate {
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public:
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explicit ThreadLocalStorageRunner(int* tls_value_ptr)
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: tls_value_ptr_(tls_value_ptr) {}
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virtual ~ThreadLocalStorageRunner() {}
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virtual void Run() OVERRIDE {
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*tls_value_ptr_ = kInitialTlsValue;
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tls_slot.Set(tls_value_ptr_);
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int *ptr = static_cast<int*>(tls_slot.Get());
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EXPECT_EQ(ptr, tls_value_ptr_);
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EXPECT_EQ(*ptr, kInitialTlsValue);
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*tls_value_ptr_ = 0;
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ptr = static_cast<int*>(tls_slot.Get());
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EXPECT_EQ(ptr, tls_value_ptr_);
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EXPECT_EQ(*ptr, 0);
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*ptr = kFinalTlsValue + kNumberDestructorCallRepetitions;
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}
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private:
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int* tls_value_ptr_;
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DISALLOW_COPY_AND_ASSIGN(ThreadLocalStorageRunner);
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};
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void ThreadLocalStorageCleanup(void *value) {
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int *ptr = reinterpret_cast<int*>(value);
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// Destructors should never be called with a NULL.
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ASSERT_NE(reinterpret_cast<int*>(NULL), ptr);
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if (*ptr == kFinalTlsValue)
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return; // We've been called enough times.
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ASSERT_LT(kFinalTlsValue, *ptr);
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ASSERT_GE(kFinalTlsValue + kNumberDestructorCallRepetitions, *ptr);
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--*ptr; // Move closer to our target.
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// Tell tls that we're not done with this thread, and still need destruction.
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tls_slot.Set(value);
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}
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} // namespace
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TEST(ThreadLocalStorageTest, Basics) {
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ThreadLocalStorage::Slot slot;
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slot.Set(reinterpret_cast<void*>(123));
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int value = reinterpret_cast<intptr_t>(slot.Get());
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EXPECT_EQ(value, 123);
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}
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#if defined(THREAD_SANITIZER)
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// Do not run the test under ThreadSanitizer. Because this test iterates its
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// own TSD destructor for the maximum possible number of times, TSan can't jump
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// in after the last destructor invocation, therefore the destructor remains
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// unsynchronized with the following users of the same TSD slot. This results
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// in race reports between the destructor and functions in other tests.
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#define MAYBE_TLSDestructors DISABLED_TLSDestructors
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#else
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#define MAYBE_TLSDestructors TLSDestructors
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#endif
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TEST(ThreadLocalStorageTest, MAYBE_TLSDestructors) {
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// Create a TLS index with a destructor. Create a set of
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// threads that set the TLS, while the destructor cleans it up.
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// After the threads finish, verify that the value is cleaned up.
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const int kNumThreads = 5;
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int values[kNumThreads];
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ThreadLocalStorageRunner* thread_delegates[kNumThreads];
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DelegateSimpleThread* threads[kNumThreads];
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tls_slot.Initialize(ThreadLocalStorageCleanup);
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// Spawn the threads.
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for (int index = 0; index < kNumThreads; index++) {
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values[index] = kInitialTlsValue;
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thread_delegates[index] = new ThreadLocalStorageRunner(&values[index]);
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threads[index] = new DelegateSimpleThread(thread_delegates[index],
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"tls thread");
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threads[index]->Start();
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}
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// Wait for the threads to finish.
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for (int index = 0; index < kNumThreads; index++) {
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threads[index]->Join();
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delete threads[index];
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delete thread_delegates[index];
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// Verify that the destructor was called and that we reset.
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EXPECT_EQ(values[index], kFinalTlsValue);
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}
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tls_slot.Free(); // Stop doing callbacks to cleanup threads.
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}
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} // namespace base
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