CSE2410 Fall 2014 Bounce

// Copyright 2008 the V8 project authors. All rights reserved.

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#include "v8.h"

#include "platform.h"

#include "isolate.h"

#include "cctest.h"

TEST(Preemption) {

  v8::Isolate* isolate = CcTest::isolate();

  v8::Locker locker(isolate);

  v8::V8::Initialize();

  v8::HandleScope scope(isolate);

  v8::Handle<v8::Context> context = v8::Context::New(isolate);

  v8::Context::Scope context_scope(context);

  v8::Locker::StartPreemption(isolate, 100);

  v8::Handle<v8::Script> script = v8::Script::Compile(

      v8::String::New("var count = 0; var obj = new Object(); count++;\n"));

  script->Run();

  v8::Locker::StopPreemption(isolate);

  v8::internal::OS::Sleep(500);  // Make sure the timer fires.

  script->Run();

}

enum Turn {

  FILL_CACHE,

  CLEAN_CACHE,

  SECOND_TIME_FILL_CACHE,

  DONE

};

static Turn turn = FILL_CACHE;

class ThreadA : public v8::internal::Thread {

 public:

  ThreadA() : Thread("ThreadA") { }

  void Run() {

    v8::Isolate* isolate = CcTest::isolate();

    v8::Locker locker(isolate);

    v8::Isolate::Scope isolate_scope(isolate);

    v8::HandleScope scope(isolate);

    v8::Handle<v8::Context> context = v8::Context::New(isolate);

    v8::Context::Scope context_scope(context);

    CHECK_EQ(FILL_CACHE, turn);

    // Fill String.search cache.

    v8::Handle<v8::Script> script = v8::Script::Compile(

        v8::String::New(

          "for (var i = 0; i < 3; i++) {"

          "  var result = \"a\".search(\"a\");"

          "  if (result != 0) throw \"result: \" + result + \" @\" + i;"

          "};"

          "true"));

    CHECK(script->Run()->IsTrue());

    turn = CLEAN_CACHE;

    do {

      {

        v8::Unlocker unlocker(CcTest::isolate());

        Thread::YieldCPU();

      }

    } while (turn != SECOND_TIME_FILL_CACHE);

    // Rerun the script.

    CHECK(script->Run()->IsTrue());

    turn = DONE;

  }

};

class ThreadB : public v8::internal::Thread {

 public:

  ThreadB() : Thread("ThreadB") { }

  void Run() {

    do {

      {

        v8::Isolate* isolate = CcTest::isolate();

        v8::Locker locker(isolate);

        v8::Isolate::Scope isolate_scope(isolate);

        if (turn == CLEAN_CACHE) {

          v8::HandleScope scope(isolate);

          v8::Handle<v8::Context> context = v8::Context::New(isolate);

          v8::Context::Scope context_scope(context);

          // Clear the caches by forcing major GC.

          CcTest::heap()->CollectAllGarbage(v8::internal::Heap::kNoGCFlags);

          turn = SECOND_TIME_FILL_CACHE;

          break;

        }

      }

      Thread::YieldCPU();

    } while (true);

  }

};

TEST(JSFunctionResultCachesInTwoThreads) {

  ThreadA threadA;

  ThreadB threadB;

  threadA.Start();

  threadB.Start();

  threadA.Join();

  threadB.Join();

  CHECK_EQ(DONE, turn);

}

class ThreadIdValidationThread : public v8::internal::Thread {

 public:

  ThreadIdValidationThread(i::Thread* thread_to_start,

                           i::List<i::ThreadId>* refs,

                           unsigned int thread_no,

                           i::Semaphore* semaphore)

    : Thread("ThreadRefValidationThread"),

      refs_(refs), thread_no_(thread_no), thread_to_start_(thread_to_start),

      semaphore_(semaphore) {

  }

  void Run() {

    i::ThreadId thread_id = i::ThreadId::Current();

    for (int i = 0; i < thread_no_; i++) {

      CHECK(!(*refs_)[i].Equals(thread_id));

    }

    CHECK(thread_id.IsValid());

    (*refs_)[thread_no_] = thread_id;

    if (thread_to_start_ != NULL) {

      thread_to_start_->Start();

    }

    semaphore_->Signal();

  }

 private:

  i::List<i::ThreadId>* refs_;

  int thread_no_;

  i::Thread* thread_to_start_;

  i::Semaphore* semaphore_;

};

TEST(ThreadIdValidation) {

  const int kNThreads = 100;

  i::List<ThreadIdValidationThread*> threads(kNThreads);

  i::List<i::ThreadId> refs(kNThreads);

  i::Semaphore* semaphore = new i::Semaphore(0);

  ThreadIdValidationThread* prev = NULL;

  for (int i = kNThreads - 1; i >= 0; i--) {

    ThreadIdValidationThread* newThread =

        new ThreadIdValidationThread(prev, &refs, i, semaphore);

    threads.Add(newThread);

    prev = newThread;

    refs.Add(i::ThreadId::Invalid());

  }

  prev->Start();

  for (int i = 0; i < kNThreads; i++) {

    semaphore->Wait();

  }

  for (int i = 0; i < kNThreads; i++) {

    delete threads[i];

  }

}

class ThreadC : public v8::internal::Thread {

 public:

  ThreadC() : Thread("ThreadC") { }

  void Run() {

    Join();

  }

};

TEST(ThreadJoinSelf) {

  ThreadC thread;

  thread.Start();

  thread.Join();

}