// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "default-platform.h"

#include <algorithm>
#include <queue>

// TODO(jochen): We should have our own version of checks.h.
#include "../checks.h"
// TODO(jochen): Why is cpu.h not in platform/?
#include "../cpu.h"
#include "worker-thread.h"

namespace v8 {
namespace internal {


const int DefaultPlatform::kMaxThreadPoolSize = 4;


DefaultPlatform::DefaultPlatform()
    : initialized_(false), thread_pool_size_(0) {}


DefaultPlatform::~DefaultPlatform() {
  LockGuard<Mutex> guard(&lock_);
  queue_.Terminate();
  if (initialized_) {
    for (std::vector<WorkerThread*>::iterator i = thread_pool_.begin();
         i != thread_pool_.end(); ++i) {
      delete *i;
    }
  }
}


void DefaultPlatform::SetThreadPoolSize(int thread_pool_size) {
  LockGuard<Mutex> guard(&lock_);
  ASSERT(thread_pool_size >= 0);
  if (thread_pool_size < 1)
    thread_pool_size = CPU::NumberOfProcessorsOnline();
  thread_pool_size_ =
      std::max(std::min(thread_pool_size, kMaxThreadPoolSize), 1);
}


void DefaultPlatform::EnsureInitialized() {
  LockGuard<Mutex> guard(&lock_);
  if (initialized_) return;
  initialized_ = true;

  for (int i = 0; i < thread_pool_size_; ++i)
    thread_pool_.push_back(new WorkerThread(&queue_));
}

void DefaultPlatform::CallOnBackgroundThread(Task *task,
                                             ExpectedRuntime expected_runtime) {
  EnsureInitialized();
  queue_.Append(task);
}


void DefaultPlatform::CallOnForegroundThread(v8::Isolate* isolate, Task* task) {
  // TODO(jochen): implement.
  task->Run();
  delete task;
}

} }  // namespace v8::internal
