YugabyteDB (2.13.0.0-b42, bfc6a6643e7399ac8a0e81d06a3ee6d6571b33ab)

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// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

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// "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.

//

// The following only applies to changes made to this file as part of YugaByte development.

//

// Portions Copyright (c) YugaByte, 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.

//

// Portions (c) 2011 The Chromium Authors.

#include "yb/util/mutex.h"

#include <glog/logging.h>

#include "yb/util/stack_trace.h"

#include "yb/util/env.h"

namespace yb {

Mutex::Mutex()

#ifndef NDEBUG

  : owning_tid_(0),

    stack_trace_(new StackTrace())

#endif

{

#ifndef NDEBUG

  // In debug, setup attributes for lock error checking.

  pthread_mutexattr_t mta;

  int rv = pthread_mutexattr_init(&mta);

  DCHECK_EQ(0, rv) << ". " << strerror(rv);

  rv = pthread_mutexattr_settype(&mta, PTHREAD_MUTEX_ERRORCHECK);

  DCHECK_EQ(0, rv) << ". " << strerror(rv);

  rv = pthread_mutex_init(&native_handle_, &mta);

  DCHECK_EQ(0, rv) << ". " << strerror(rv);

  rv = pthread_mutexattr_destroy(&mta);

  DCHECK_EQ(0, rv) << ". " << strerror(rv);

#else

  // In release, go with the default lock attributes.

  pthread_mutex_init(&native_handle_, NULL);

#endif

}

Mutex::~Mutex() {

  int rv = pthread_mutex_destroy(&native_handle_);

  DCHECK_EQ(0, rv) << ". " << strerror(rv);

}

bool Mutex::TryAcquire() {

  int rv = pthread_mutex_trylock(&native_handle_);

#ifndef NDEBUG

  DCHECK(rv == 0 || rv == EBUSY) << ". " << strerror(rv)

      << ". Owner tid: " << owning_tid_ << "; Self tid: " << Env::Default()->gettid()

      << "; Owner stack: " << std::endl << stack_trace_->Symbolize();;

  if (rv == 0) {

    CheckUnheldAndMark();

  }

#endif

  return rv == 0;

}

void Mutex::Acquire() {

  int rv = pthread_mutex_lock(&native_handle_);

#ifndef NDEBUG

  DCHECK_EQ(0, rv) << ". " << strerror(rv)

      << ". Owner tid: " << owning_tid_ << "; Self tid: " << Env::Default()->gettid()

      << "; Owner stack: " << std::endl << stack_trace_->Symbolize();;

  CheckUnheldAndMark();

#else

  DCHECK(!rv);

#endif

}

void Mutex::Release() {

#ifndef NDEBUG

  CheckHeldAndUnmark();

#endif

  int rv = pthread_mutex_unlock(&native_handle_);

  DCHECK_EQ(0, rv) << ". " << strerror(rv);

}

#ifndef NDEBUG

void Mutex::AssertAcquired() const {

  DCHECK_EQ(Env::Default()->gettid(), owning_tid_);

}

void Mutex::CheckHeldAndUnmark() {

  AssertAcquired();

  owning_tid_ = 0;

  stack_trace_->Reset();

}

void Mutex::CheckUnheldAndMark() {

  DCHECK_EQ(0, owning_tid_);

  owning_tid_ = Env::Default()->gettid();

  stack_trace_->Collect();

}

#endif

} // namespace yb