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// Copyright 2020 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/heap/safepoint.h"
#include "src/base/platform/mutex.h"
#include "src/base/platform/platform.h"
#include "src/heap/heap.h"
#include "src/heap/local-heap.h"
#include "src/heap/parked-scope.h"
#include "test/unittests/test-utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace v8 {
namespace internal {
void EnsureFlagLocalHeapsEnabled() {
// Avoid data race in concurrent thread by only setting the flag to true if
// not already enabled.
if (!FLAG_local_heaps) FLAG_local_heaps = true;
}
using SafepointTest = TestWithIsolate;
TEST_F(SafepointTest, ReachSafepointWithoutLocalHeaps) {
EnsureFlagLocalHeapsEnabled();
Heap* heap = i_isolate()->heap();
bool run = false;
{
SafepointScope scope(heap);
run = true;
}
CHECK(run);
}
class ParkedThread final : public v8::base::Thread {
public:
ParkedThread(Heap* heap, base::Mutex* mutex)
: v8::base::Thread(base::Thread::Options("ThreadWithLocalHeap")),
heap_(heap),
mutex_(mutex) {}
void Run() override {
LocalHeap local_heap(heap_, ThreadKind::kBackground);
if (mutex_) {
base::MutexGuard guard(mutex_);
}
}
Heap* heap_;
base::Mutex* mutex_;
};
TEST_F(SafepointTest, StopParkedThreads) {
EnsureFlagLocalHeapsEnabled();
Heap* heap = i_isolate()->heap();
int safepoints = 0;
const int kThreads = 10;
const int kRuns = 5;
for (int run = 0; run < kRuns; run++) {
base::Mutex mutex;
std::vector<ParkedThread*> threads;
mutex.Lock();
for (int i = 0; i < kThreads; i++) {
ParkedThread* thread =
new ParkedThread(heap, i % 2 == 0 ? &mutex : nullptr);
CHECK(thread->Start());
threads.push_back(thread);
}
{
SafepointScope scope(heap);
safepoints++;
}
mutex.Unlock();
for (ParkedThread* thread : threads) {
thread->Join();
delete thread;
}
}
CHECK_EQ(safepoints, kRuns);
}
static const int kRuns = 10000;
class RunningThread final : public v8::base::Thread {
public:
RunningThread(Heap* heap, std::atomic<int>* counter)
: v8::base::Thread(base::Thread::Options("ThreadWithLocalHeap")),
heap_(heap),
counter_(counter) {}
void Run() override {
LocalHeap local_heap(heap_, ThreadKind::kBackground);
UnparkedScope unparked_scope(&local_heap);
for (int i = 0; i < kRuns; i++) {
counter_->fetch_add(1);
if (i % 100 == 0) local_heap.Safepoint();
}
}
Heap* heap_;
std::atomic<int>* counter_;
};
TEST_F(SafepointTest, StopRunningThreads) {
EnsureFlagLocalHeapsEnabled();
Heap* heap = i_isolate()->heap();
const int kThreads = 10;
const int kRuns = 5;
const int kSafepoints = 3;
int safepoint_count = 0;
for (int run = 0; run < kRuns; run++) {
std::atomic<int> counter(0);
std::vector<RunningThread*> threads;
for (int i = 0; i < kThreads; i++) {
RunningThread* thread = new RunningThread(heap, &counter);
CHECK(thread->Start());
threads.push_back(thread);
}
for (int i = 0; i < kSafepoints; i++) {
SafepointScope scope(heap);
safepoint_count++;
}
for (RunningThread* thread : threads) {
thread->Join();
delete thread;
}
}
CHECK_EQ(safepoint_count, kRuns * kSafepoints);
}
} // namespace internal
} // namespace v8
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