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// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
/* Copyright (c) 2006, 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.
*
* ---
* Author: Sanjay Ghemawat
*/
#include <stdio.h>
#include "base/logging.h"
#include "base/atomicops.h"
#define GG_ULONGLONG(x) static_cast<uint64>(x)
#define NUM_BITS(T) (sizeof(T) * 8)
template <class AtomicType>
static void TestCompareAndSwap(AtomicType (*compare_and_swap_func)
(volatile AtomicType*, AtomicType, AtomicType)) {
AtomicType value = 0;
AtomicType prev = (*compare_and_swap_func)(&value, 0, 1);
ASSERT_EQ(1, value);
ASSERT_EQ(0, prev);
// Use test value that has non-zero bits in both halves, more for testing
// 64-bit implementation on 32-bit platforms.
const AtomicType k_test_val = (GG_ULONGLONG(1) <<
(NUM_BITS(AtomicType) - 2)) + 11;
value = k_test_val;
prev = (*compare_and_swap_func)(&value, 0, 5);
ASSERT_EQ(k_test_val, value);
ASSERT_EQ(k_test_val, prev);
value = k_test_val;
prev = (*compare_and_swap_func)(&value, k_test_val, 5);
ASSERT_EQ(5, value);
ASSERT_EQ(k_test_val, prev);
}
template <class AtomicType>
static void TestAtomicExchange(AtomicType (*atomic_exchange_func)
(volatile AtomicType*, AtomicType)) {
AtomicType value = 0;
AtomicType new_value = (*atomic_exchange_func)(&value, 1);
ASSERT_EQ(1, value);
ASSERT_EQ(0, new_value);
// Use test value that has non-zero bits in both halves, more for testing
// 64-bit implementation on 32-bit platforms.
const AtomicType k_test_val = (GG_ULONGLONG(1) <<
(NUM_BITS(AtomicType) - 2)) + 11;
value = k_test_val;
new_value = (*atomic_exchange_func)(&value, k_test_val);
ASSERT_EQ(k_test_val, value);
ASSERT_EQ(k_test_val, new_value);
value = k_test_val;
new_value = (*atomic_exchange_func)(&value, 5);
ASSERT_EQ(5, value);
ASSERT_EQ(k_test_val, new_value);
}
// This is a simple sanity check that values are correct. Not testing
// atomicity
template <class AtomicType>
static void TestStore() {
const AtomicType kVal1 = static_cast<AtomicType>(0xa5a5a5a5a5a5a5a5LL);
const AtomicType kVal2 = static_cast<AtomicType>(-1);
AtomicType value;
base::subtle::NoBarrier_Store(&value, kVal1);
ASSERT_EQ(kVal1, value);
base::subtle::NoBarrier_Store(&value, kVal2);
ASSERT_EQ(kVal2, value);
base::subtle::Release_Store(&value, kVal1);
ASSERT_EQ(kVal1, value);
base::subtle::Release_Store(&value, kVal2);
ASSERT_EQ(kVal2, value);
}
// This is a simple sanity check that values are correct. Not testing
// atomicity
template <class AtomicType>
static void TestLoad() {
const AtomicType kVal1 = static_cast<AtomicType>(0xa5a5a5a5a5a5a5a5LL);
const AtomicType kVal2 = static_cast<AtomicType>(-1);
AtomicType value;
value = kVal1;
ASSERT_EQ(kVal1, base::subtle::NoBarrier_Load(&value));
value = kVal2;
ASSERT_EQ(kVal2, base::subtle::NoBarrier_Load(&value));
value = kVal1;
ASSERT_EQ(kVal1, base::subtle::Acquire_Load(&value));
value = kVal2;
ASSERT_EQ(kVal2, base::subtle::Acquire_Load(&value));
}
template <class AtomicType>
static void TestAtomicOps() {
TestCompareAndSwap<AtomicType>(base::subtle::NoBarrier_CompareAndSwap);
TestCompareAndSwap<AtomicType>(base::subtle::Acquire_CompareAndSwap);
TestCompareAndSwap<AtomicType>(base::subtle::Release_CompareAndSwap);
TestAtomicExchange<AtomicType>(base::subtle::NoBarrier_AtomicExchange);
TestAtomicExchange<AtomicType>(base::subtle::Acquire_AtomicExchange);
TestAtomicExchange<AtomicType>(base::subtle::Release_AtomicExchange);
TestStore<AtomicType>();
TestLoad<AtomicType>();
}
int main(int argc, char** argv) {
TestAtomicOps<AtomicWord>();
TestAtomicOps<Atomic32>();
printf("PASS\n");
return 0;
}