text: /**
   *    Copyright (C) 2014 MongoDB Inc.
   *
   *    This program is free software: you can redistribute it and/or  modify
   *    it under the terms of the GNU Affero General Public License, version 3,
   *    as published by the Free Software Foundation.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    GNU Affero General Public License for more details.
   *
   *    You should have received a copy of the GNU Affero General Public License
   *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   *    As a special exception, the copyright holders give permission to link the
   *    code of portions of this program with the OpenSSL library under certain
   *    conditions as described in each individual source file and distribute
   *    linked combinations including the program with the OpenSSL library. You
   *    must comply with the GNU Affero General Public License in all respects for
   *    all of the code used other than as permitted herein. If you modify file(s)
   *    with this exception, you may extend this exception to your version of the
   *    file(s), but you are not obligated to do so. If you do not wish to do so,
   *    delete this exception statement from your version. If you delete this
   *    exception statement from all source files in the program, then also delete
   *    it in the license file.
   */
  
  #include "mongo/platform/basic.h"
  
  #include "mongo/bson/bsonobjbuilder.h"
  #include "mongo/db/concurrency/lock_manager_test_help.h"
  #include "mongo/unittest/unittest.h"
  
  namespace mongo {
  
  TEST(LockStats, NoWait) {
      const ResourceId resId(RESOURCE_COLLECTION, std::string("LockStats.NoWait"));
  
      resetGlobalLockStats();
  
      LockerForTests locker(MODE_IX);
      locker.lock(resId, MODE_X);
      locker.unlock(resId);
  
      // Make sure that the waits/blocks are zero
      SingleThreadedLockStats stats;
      reportGlobalLockingStats(&stats);
  
      ASSERT_EQUALS(1, stats.get(resId, MODE_X).numAcquisitions);
      ASSERT_EQUALS(0, stats.get(resId, MODE_X).numWaits);
      ASSERT_EQUALS(0, stats.get(resId, MODE_X).combinedWaitTimeMicros);
  }
  
  TEST(LockStats, Wait) {
      const ResourceId resId(RESOURCE_COLLECTION, std::string("LockStats.Wait"));
  
      resetGlobalLockStats();
  
      LockerForTests locker(MODE_IX);
      locker.lock(resId, MODE_X);
  
      {
          // This will block
          LockerForTests lockerConflict(MODE_IX);
          ASSERT_EQUALS(LOCK_WAITING, lockerConflict.lockBegin(resId, MODE_S));
  
          // Sleep 1 millisecond so the wait time passes
          ASSERT_EQUALS(LOCK_TIMEOUT,
                        lockerConflict.lockComplete(resId, MODE_S, Milliseconds(1), false));
      }
  
      // Make sure that the waits/blocks are non-zero
      SingleThreadedLockStats stats;
      reportGlobalLockingStats(&stats);
  
      ASSERT_EQUALS(1, stats.get(resId, MODE_X).numAcquisitions);
      ASSERT_EQUALS(0, stats.get(resId, MODE_X).numWaits);
      ASSERT_EQUALS(0, stats.get(resId, MODE_X).combinedWaitTimeMicros);
  
      ASSERT_EQUALS(1, stats.get(resId, MODE_S).numAcquisitions);
      ASSERT_EQUALS(1, stats.get(resId, MODE_S).numWaits);
      ASSERT_GREATER_THAN(stats.get(resId, MODE_S).combinedWaitTimeMicros, 0);
  }
  
  TEST(LockStats, Reporting) {
      const ResourceId resId(RESOURCE_COLLECTION, std::string("LockStats.Reporting"));
  
      resetGlobalLockStats();
  
      LockerForTests locker(MODE_IX);
      locker.lock(resId, MODE_X);
      locker.unlock(resId);
  
      // Make sure that the waits/blocks are zero
      SingleThreadedLockStats stats;
      reportGlobalLockingStats(&stats);
  
      BSONObjBuilder builder;
      stats.report(&builder);
  }
  
  }  // namespace mongo
  