blob: 6206569433428a19975c3ff7a6645f4b40d10c91 [file] [log] [blame]
// Copyright 2014 the V8 project 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 "src/base/platform/condition-variable.h"
#include "src/base/platform/platform.h"
#include "src/base/platform/time.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace v8 {
namespace base {
TEST(ConditionVariable, WaitForAfterNofityOnSameThread) {
for (int n = 0; n < 10; ++n) {
Mutex mutex;
ConditionVariable cv;
MutexGuard lock_guard(&mutex);
cv.NotifyOne();
EXPECT_FALSE(cv.WaitFor(&mutex, TimeDelta::FromMicroseconds(n)));
cv.NotifyAll();
EXPECT_FALSE(cv.WaitFor(&mutex, TimeDelta::FromMicroseconds(n)));
}
}
namespace {
class ThreadWithMutexAndConditionVariable final : public Thread {
public:
ThreadWithMutexAndConditionVariable()
: Thread(Options("ThreadWithMutexAndConditionVariable")),
running_(false),
finished_(false) {}
void Run() override {
MutexGuard lock_guard(&mutex_);
running_ = true;
cv_.NotifyOne();
while (running_) {
cv_.Wait(&mutex_);
}
finished_ = true;
cv_.NotifyAll();
}
bool running_;
bool finished_;
ConditionVariable cv_;
Mutex mutex_;
};
} // namespace
TEST(ConditionVariable, MultipleThreadsWithSeparateConditionVariables) {
static const int kThreadCount = 128;
ThreadWithMutexAndConditionVariable threads[kThreadCount];
for (int n = 0; n < kThreadCount; ++n) {
MutexGuard lock_guard(&threads[n].mutex_);
EXPECT_FALSE(threads[n].running_);
EXPECT_FALSE(threads[n].finished_);
threads[n].Start();
// Wait for nth thread to start.
while (!threads[n].running_) {
threads[n].cv_.Wait(&threads[n].mutex_);
}
}
for (int n = kThreadCount - 1; n >= 0; --n) {
MutexGuard lock_guard(&threads[n].mutex_);
EXPECT_TRUE(threads[n].running_);
EXPECT_FALSE(threads[n].finished_);
}
for (int n = 0; n < kThreadCount; ++n) {
MutexGuard lock_guard(&threads[n].mutex_);
EXPECT_TRUE(threads[n].running_);
EXPECT_FALSE(threads[n].finished_);
// Tell the nth thread to quit.
threads[n].running_ = false;
threads[n].cv_.NotifyOne();
}
for (int n = kThreadCount - 1; n >= 0; --n) {
// Wait for nth thread to quit.
MutexGuard lock_guard(&threads[n].mutex_);
while (!threads[n].finished_) {
threads[n].cv_.Wait(&threads[n].mutex_);
}
EXPECT_FALSE(threads[n].running_);
EXPECT_TRUE(threads[n].finished_);
}
for (int n = 0; n < kThreadCount; ++n) {
threads[n].Join();
MutexGuard lock_guard(&threads[n].mutex_);
EXPECT_FALSE(threads[n].running_);
EXPECT_TRUE(threads[n].finished_);
}
}
namespace {
class ThreadWithSharedMutexAndConditionVariable final : public Thread {
public:
ThreadWithSharedMutexAndConditionVariable()
: Thread(Options("ThreadWithSharedMutexAndConditionVariable")),
running_(false),
finished_(false),
cv_(nullptr),
mutex_(nullptr) {}
void Run() override {
MutexGuard lock_guard(mutex_);
running_ = true;
cv_->NotifyAll();
while (running_) {
cv_->Wait(mutex_);
}
finished_ = true;
cv_->NotifyAll();
}
bool running_;
bool finished_;
ConditionVariable* cv_;
Mutex* mutex_;
};
} // namespace
TEST(ConditionVariable, MultipleThreadsWithSharedSeparateConditionVariables) {
static const int kThreadCount = 128;
ThreadWithSharedMutexAndConditionVariable threads[kThreadCount];
ConditionVariable cv;
Mutex mutex;
for (int n = 0; n < kThreadCount; ++n) {
threads[n].mutex_ = &mutex;
threads[n].cv_ = &cv;
}
// Start all threads.
{
MutexGuard lock_guard(&mutex);
for (int n = 0; n < kThreadCount; ++n) {
EXPECT_FALSE(threads[n].running_);
EXPECT_FALSE(threads[n].finished_);
threads[n].Start();
}
}
// Wait for all threads to start.
{
MutexGuard lock_guard(&mutex);
for (int n = kThreadCount - 1; n >= 0; --n) {
while (!threads[n].running_) {
cv.Wait(&mutex);
}
}
}
// Make sure that all threads are running.
{
MutexGuard lock_guard(&mutex);
for (int n = 0; n < kThreadCount; ++n) {
EXPECT_TRUE(threads[n].running_);
EXPECT_FALSE(threads[n].finished_);
}
}
// Tell all threads to quit.
{
MutexGuard lock_guard(&mutex);
for (int n = kThreadCount - 1; n >= 0; --n) {
EXPECT_TRUE(threads[n].running_);
EXPECT_FALSE(threads[n].finished_);
// Tell the nth thread to quit.
threads[n].running_ = false;
}
cv.NotifyAll();
}
// Wait for all threads to quit.
{
MutexGuard lock_guard(&mutex);
for (int n = 0; n < kThreadCount; ++n) {
while (!threads[n].finished_) {
cv.Wait(&mutex);
}
}
}
// Make sure all threads are finished.
{
MutexGuard lock_guard(&mutex);
for (int n = kThreadCount - 1; n >= 0; --n) {
EXPECT_FALSE(threads[n].running_);
EXPECT_TRUE(threads[n].finished_);
}
}
// Join all threads.
for (int n = 0; n < kThreadCount; ++n) {
threads[n].Join();
}
}
namespace {
class LoopIncrementThread final : public Thread {
public:
LoopIncrementThread(int rem, int* counter, int limit, int thread_count,
ConditionVariable* cv, Mutex* mutex)
: Thread(Options("LoopIncrementThread")),
rem_(rem),
counter_(counter),
limit_(limit),
thread_count_(thread_count),
cv_(cv),
mutex_(mutex) {
EXPECT_LT(rem, thread_count);
EXPECT_EQ(0, limit % thread_count);
}
void Run() override {
int last_count = -1;
while (true) {
MutexGuard lock_guard(mutex_);
int count = *counter_;
while (count % thread_count_ != rem_ && count < limit_) {
cv_->Wait(mutex_);
count = *counter_;
}
if (count >= limit_) break;
EXPECT_EQ(*counter_, count);
if (last_count != -1) {
EXPECT_EQ(last_count + (thread_count_ - 1), count);
}
count++;
*counter_ = count;
last_count = count;
cv_->NotifyAll();
}
}
private:
const int rem_;
int* counter_;
const int limit_;
const int thread_count_;
ConditionVariable* cv_;
Mutex* mutex_;
};
} // namespace
TEST(ConditionVariable, LoopIncrement) {
static const int kMaxThreadCount = 16;
Mutex mutex;
ConditionVariable cv;
for (int thread_count = 1; thread_count < kMaxThreadCount; ++thread_count) {
int limit = thread_count * 10;
int counter = 0;
// Setup the threads.
Thread** threads = new Thread* [thread_count];
for (int n = 0; n < thread_count; ++n) {
threads[n] = new LoopIncrementThread(n, &counter, limit, thread_count,
&cv, &mutex);
}
// Start all threads.
for (int n = thread_count - 1; n >= 0; --n) {
threads[n]->Start();
}
// Join and cleanup all threads.
for (int n = 0; n < thread_count; ++n) {
threads[n]->Join();
delete threads[n];
}
delete[] threads;
EXPECT_EQ(limit, counter);
}
}
} // namespace base
} // namespace v8