// Copyright 2008 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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#include "src/v8.h"
#include "test/cctest/cctest.h"

#include "src/base/platform/platform.h"
#include "src/isolate.h"

class ThreadIdValidationThread : public v8::base::Thread {
 public:
  ThreadIdValidationThread(v8::base::Thread* thread_to_start,
                           std::vector<i::ThreadId>* refs,
                           unsigned int thread_no,
                           v8::base::Semaphore* semaphore)
      : Thread(Options("ThreadRefValidationThread")),
        refs_(refs),
        thread_no_(thread_no),
        thread_to_start_(thread_to_start),
        semaphore_(semaphore) {}

  void Run() override {
    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_ != nullptr) {
      thread_to_start_->Start();
    }
    semaphore_->Signal();
  }

 private:
  std::vector<i::ThreadId>* refs_;
  int thread_no_;
  v8::base::Thread* thread_to_start_;
  v8::base::Semaphore* semaphore_;
};


TEST(ThreadIdValidation) {
  const int kNThreads = 100;
  std::vector<ThreadIdValidationThread*> threads;
  std::vector<i::ThreadId> refs;
  threads.reserve(kNThreads);
  refs.reserve(kNThreads);
  v8::base::Semaphore semaphore(0);
  ThreadIdValidationThread* prev = nullptr;
  for (int i = kNThreads - 1; i >= 0; i--) {
    ThreadIdValidationThread* newThread =
        new ThreadIdValidationThread(prev, &refs, i, &semaphore);
    threads.push_back(newThread);
    prev = newThread;
    refs.push_back(i::ThreadId::Invalid());
  }
  prev->Start();
  for (int i = 0; i < kNThreads; i++) {
    semaphore.Wait();
  }
  for (int i = 0; i < kNThreads; i++) {
    delete threads[i];
  }
}