src/pagespeed/kernel/base/simple_stats.cc

/*
 * Copyright 2010 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// Author: jmarantz@google.com (Joshua Marantz)

#include "pagespeed/kernel/base/simple_stats.h"

#include "pagespeed/kernel/base/abstract_mutex.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/base/thread_system.h"
#include "pagespeed/kernel/util/platform.h"

namespace net_instaweb {

SimpleStatsVariable::~SimpleStatsVariable() {
}

// TODO(jmarantz): Remove this constructor and pass in thread-system explicitly.
SimpleStats::SimpleStats()
    : thread_system_(Platform::CreateThreadSystem()),
      own_thread_system_(true) {
}

SimpleStats::SimpleStats(ThreadSystem* thread_system)
    : thread_system_(thread_system),
      own_thread_system_(false) {
}

SimpleStats::~SimpleStats() {
  if (own_thread_system_) {
    delete thread_system_;
  }
  thread_system_ = NULL;
}

SimpleStatsVariable* SimpleStats::NewVariable(
    const StringPiece& name, int index) {
  return new SimpleStatsVariable(thread_system_->NewMutex());
}

SimpleStatsVariable::SimpleStatsVariable(AbstractMutex* mutex)
    : value_(0),
      mutex_(mutex) {
}

int64 SimpleStatsVariable::GetLockHeld() const {
  return value_;
}

int64 SimpleStatsVariable::SetReturningPreviousValueLockHeld(int64 value) {
  int64 previous_value = value_;
  value_ = value;
  return previous_value;
}

}  // namespace net_instaweb