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//===-- mutex_test.cc -------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "mutex.h"
#include "gtest/gtest.h"
#include <string.h>
template <typename MutexType> class TestData {
public:
explicit TestData(MutexType *M) : Mutex(M) {
for (scudo::u32 I = 0; I < Size; I++)
Data[I] = 0;
}
void write() {
Lock L(Mutex);
T V0 = Data[0];
for (scudo::u32 I = 0; I < Size; I++) {
EXPECT_EQ(Data[I], V0);
Data[I]++;
}
}
void tryWrite() {
if (!Mutex->tryLock())
return;
T V0 = Data[0];
for (scudo::u32 I = 0; I < Size; I++) {
EXPECT_EQ(Data[I], V0);
Data[I]++;
}
Mutex->unlock();
}
void backoff() {
volatile T LocalData[Size] = {};
for (scudo::u32 I = 0; I < Size; I++) {
LocalData[I]++;
EXPECT_EQ(LocalData[I], 1U);
}
}
private:
typedef scudo::GenericScopedLock<MutexType> Lock;
static const scudo::u32 Size = 64U;
typedef scudo::u64 T;
MutexType *Mutex;
ALIGNED(SCUDO_CACHE_LINE_SIZE) T Data[Size];
};
const scudo::u32 NumberOfThreads = 8;
#if SCUDO_DEBUG
const scudo::u32 NumberOfIterations = 4 * 1024;
#else
const scudo::u32 NumberOfIterations = 16 * 1024;
#endif
template <typename MutexType> static void *lockThread(void *Param) {
TestData<MutexType> *Data = reinterpret_cast<TestData<MutexType> *>(Param);
for (scudo::u32 I = 0; I < NumberOfIterations; I++) {
Data->write();
Data->backoff();
}
return 0;
}
template <typename MutexType> static void *tryThread(void *Param) {
TestData<MutexType> *Data = reinterpret_cast<TestData<MutexType> *>(Param);
for (scudo::u32 I = 0; I < NumberOfIterations; I++) {
Data->tryWrite();
Data->backoff();
}
return 0;
}
template <typename MutexType> static void checkLocked(MutexType *M) {
scudo::GenericScopedLock<MutexType> L(M);
M->checkLocked();
}
TEST(ScudoMutexTest, SpinMutex) {
scudo::SpinMutex M;
M.init();
TestData<scudo::SpinMutex> Data(&M);
pthread_t Threads[NumberOfThreads];
for (scudo::u32 I = 0; I < NumberOfThreads; I++)
pthread_create(&Threads[I], 0, lockThread<scudo::SpinMutex>, &Data);
for (scudo::u32 I = 0; I < NumberOfThreads; I++)
pthread_join(Threads[I], 0);
}
TEST(ScudoMutexTest, SpinMutexTry) {
scudo::SpinMutex M;
M.init();
TestData<scudo::SpinMutex> Data(&M);
pthread_t Threads[NumberOfThreads];
for (scudo::u32 I = 0; I < NumberOfThreads; I++)
pthread_create(&Threads[I], 0, tryThread<scudo::SpinMutex>, &Data);
for (scudo::u32 I = 0; I < NumberOfThreads; I++)
pthread_join(Threads[I], 0);
}
TEST(ScudoMutexTest, BlockingMutex) {
scudo::u64 MutexMemory[1024] = {};
scudo::BlockingMutex *M =
new (MutexMemory) scudo::BlockingMutex(scudo::LINKER_INITIALIZED);
TestData<scudo::BlockingMutex> Data(M);
pthread_t Threads[NumberOfThreads];
for (scudo::u32 I = 0; I < NumberOfThreads; I++)
pthread_create(&Threads[I], 0, lockThread<scudo::BlockingMutex>, &Data);
for (scudo::u32 I = 0; I < NumberOfThreads; I++)
pthread_join(Threads[I], 0);
checkLocked(M);
}
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