// Copyright (c) 2011 The Chromium 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 "base/threading/thread_checker_impl.h"

namespace base {

ThreadCheckerImpl::ThreadCheckerImpl()
    : valid_thread_id_(kInvalidThreadId) {
  EnsureThreadIdAssigned();
}

ThreadCheckerImpl::~ThreadCheckerImpl() {}

bool ThreadCheckerImpl::CalledOnValidThread() const {
  EnsureThreadIdAssigned();
  AutoLock auto_lock(lock_);
  return valid_thread_id_ == PlatformThread::CurrentId();
}

void ThreadCheckerImpl::DetachFromThread() {
  AutoLock auto_lock(lock_);
  valid_thread_id_ = kInvalidThreadId;
}

void ThreadCheckerImpl::EnsureThreadIdAssigned() const {
  AutoLock auto_lock(lock_);
  if (valid_thread_id_ != kInvalidThreadId)
    return;
  valid_thread_id_ = PlatformThread::CurrentId();
}

}  // namespace base