2 * Copyright 2014 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/SmallLocks.h>
28 #include <gtest/gtest.h>
31 using folly::MicroSpinLock;
32 using folly::PicoSpinLock;
33 using folly::MSLGuard;
43 memset(ar, 0, sizeof ar);
47 // Compile time test for packed struct support (requires that both of
48 // these classes are POD).
50 struct ignore1 { MicroSpinLock msl; int16_t foo; } FOLLY_PACK_ATTR;
51 struct ignore2 { PicoSpinLock<uint32_t> psl; int16_t foo; }
53 static_assert(sizeof(ignore1) == 3, "Size check failed");
54 static_assert(sizeof(ignore2) == 6, "Size check failed");
61 unsigned int seed = (uintptr_t)pthread_self();
62 for (int i = 0; i < max; i++) {
67 for (size_t i = 1; i < sizeof v.ar / sizeof i; ++i) {
68 EXPECT_EQ(first, v.ar[i]);
71 int byte = rand_r(&seed);
72 memset(v.ar, char(byte), sizeof v.ar);
76 template<class T> struct PslTest {
79 PslTest() { lock.init(); }
82 T ourVal = rand() % (T(1) << (sizeof(T) * 8 - 1));
83 for (int i = 0; i < 10000; ++i) {
84 std::lock_guard<PicoSpinLock<T>> guard(lock);
86 for (int n = 0; n < 10; ++n) {
87 asm volatile("pause");
88 EXPECT_EQ(lock.getData(), ourVal);
99 std::vector<std::thread> threads;
100 for (int i = 0; i < nthrs; ++i) {
101 threads.push_back(std::thread(&PslTest<T>::doTest, &testObj));
103 for (auto& t : threads) {
114 std::lock_guard<MicroSpinLock> g(lock_);
115 // This bug depends on gcc register allocation and is very sensitive. We
116 // have to use DCHECK instead of EXPECT_*.
117 DCHECK(!lock_.try_lock());
126 TEST(SmallLocks, SpinLockCorrectness) {
127 EXPECT_EQ(sizeof(MicroSpinLock), 1);
129 int nthrs = sysconf(_SC_NPROCESSORS_ONLN) * 2;
130 std::vector<std::thread> threads;
131 for (int i = 0; i < nthrs; ++i) {
132 threads.push_back(std::thread(splock_test));
134 for (auto& t : threads) {
139 TEST(SmallLocks, PicoSpinCorrectness) {
140 doPslTest<int16_t>();
141 doPslTest<uint16_t>();
142 doPslTest<int32_t>();
143 doPslTest<uint32_t>();
144 doPslTest<int64_t>();
145 doPslTest<uint64_t>();
148 TEST(SmallLocks, PicoSpinSigned) {
149 typedef PicoSpinLock<int16_t,0> Lock;
152 EXPECT_EQ(val.getData(), -4);
155 std::lock_guard<Lock> guard(val);
156 EXPECT_EQ(val.getData(), -4);
158 EXPECT_EQ(val.getData(), -8);
160 EXPECT_EQ(val.getData(), -8);
163 TEST(SmallLocks, RegClobber) {