/src/logging-log4cxx/src/main/cpp/threadutility.cpp

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

#include "log4cxx/helpers/threadutility.h"
#if !defined(LOG4CXX)
  #define LOG4CXX 1
#endif
#include "log4cxx/private/log4cxx_private.h"
#include "log4cxx/helpers/loglog.h"
#include "log4cxx/helpers/transcoder.h"

#include <signal.h>
#include <mutex>
#include <list>
#include <condition_variable>
#include <algorithm>

#ifdef _WIN32
  #include <windows.h>
  #include <processthreadsapi.h>
#endif

#if LOG4CXX_EVENTS_AT_EXIT
#include <log4cxx/private/atexitregistry.h>
#endif
#if !defined(LOG4CXX)
  #define LOG4CXX 1
#endif
#include <log4cxx/helpers/aprinitializer.h>

namespace LOG4CXX_NS
{
namespace helpers
{

struct ThreadUtility::priv_data
{
  priv_data()
#if LOG4CXX_EVENTS_AT_EXIT
    : atExitRegistryRaii{ [this]{ stopThread(); } }
#endif
  {
  }

  ~priv_data()
  { stopThread(); }

  ThreadStartPre  start_pre{nullptr};
  ThreadStarted   started{nullptr};
  ThreadStartPost start_post{nullptr};

  using TimePoint = std::chrono::time_point<std::chrono::system_clock>;
  struct NamedPeriodicFunction
  {
    LogString             name;
    Period                delay;
    TimePoint             nextRun;
    std::function<void()> f;
    int                   errorCount;
    bool                  removed;
  };
  using JobStore = std::list<NamedPeriodicFunction>;
  JobStore                  jobs;
  std::recursive_mutex      job_mutex;
  std::thread               thread;
  std::condition_variable   interrupt;
  std::mutex                interrupt_mutex;
  bool                      terminated{ false };
  int                       retryCount{ 2 };
  Period                    maxDelay{ 0 };

  void doPeriodicTasks();

  void setTerminated()
  {
    std::lock_guard<std::mutex> lock(interrupt_mutex);
    terminated = true;
  }

  void stopThread()
  {
    setTerminated();
    interrupt.notify_all();
    if (thread.joinable())
      thread.join();
  }

#if LOG4CXX_EVENTS_AT_EXIT
  helpers::AtExitRegistry::Raii atExitRegistryRaii;
#endif
};

#if LOG4CXX_HAS_PTHREAD_SIGMASK
  static thread_local sigset_t old_mask;
  static thread_local bool sigmask_valid;
#endif

ThreadUtility::ThreadUtility()
  : m_priv( std::make_unique<priv_data>() )
{
  // Block signals by default.
  configureFuncs( std::bind( &ThreadUtility::preThreadBlockSignals, this ),
    nullptr,
    std::bind( &ThreadUtility::postThreadUnblockSignals, this ) );
}

ThreadUtility::~ThreadUtility() {}

auto ThreadUtility::instancePtr() -> ManagerPtr
{
  auto result = APRInitializer::getOrAddUnique<Manager>
    ( []() -> ObjectPtr
      { return std::make_shared<Manager>(); }
    );
  return result;
}

ThreadUtility* ThreadUtility::instance()
{
  return &instancePtr()->value();
}

void ThreadUtility::configure( ThreadConfigurationType type )
{
  auto utility = instance();

  if ( type == ThreadConfigurationType::NoConfiguration )
  {
    utility->configureFuncs( nullptr, nullptr, nullptr );
  }
  else if ( type == ThreadConfigurationType::NameThreadOnly )
  {
    utility->configureFuncs( nullptr,
      std::bind( &ThreadUtility::threadStartedNameThread, utility,
        std::placeholders::_1,
        std::placeholders::_2,
        std::placeholders::_3 ),
      nullptr );
  }
  else if ( type == ThreadConfigurationType::BlockSignalsOnly )
  {
    utility->configureFuncs( std::bind( &ThreadUtility::preThreadBlockSignals, utility ),
      nullptr,
      std::bind( &ThreadUtility::postThreadUnblockSignals, utility ) );
  }
  else if ( type == ThreadConfigurationType::BlockSignalsAndNameThread )
  {
    utility->configureFuncs( std::bind( &ThreadUtility::preThreadBlockSignals, utility ),
      std::bind( &ThreadUtility::threadStartedNameThread, utility,
        std::placeholders::_1,
        std::placeholders::_2,
        std::placeholders::_3 ),
      std::bind( &ThreadUtility::postThreadUnblockSignals, utility ) );
  }
}

void ThreadUtility::configureFuncs( ThreadStartPre pre_start,
  ThreadStarted started,
  ThreadStartPost post_start )
{
  m_priv->start_pre = pre_start;
  m_priv->started = started;
  m_priv->start_post = post_start;
}

void ThreadUtility::preThreadBlockSignals()
{
#if LOG4CXX_HAS_PTHREAD_SIGMASK
  sigset_t set;
  sigfillset(&set);

  if ( pthread_sigmask(SIG_SETMASK, &set, &old_mask) < 0 )
  {
    LOGLOG_ERROR( LOG4CXX_STR("Unable to set thread sigmask") );
    sigmask_valid = false;
  }
  else
  {
    sigmask_valid = true;
  }

#endif /* LOG4CXX_HAS_PTHREAD_SIGMASK */
}

void ThreadUtility::threadStartedNameThread(LogString threadName,
  std::thread::id /*threadId*/,
  std::thread::native_handle_type nativeHandle)
{
#if LOG4CXX_HAS_PTHREAD_SETNAME && !(defined(_WIN32) && defined(_LIBCPP_VERSION))
  LOG4CXX_ENCODE_CHAR(sthreadName, threadName);
  if (pthread_setname_np(static_cast<pthread_t>(nativeHandle), sthreadName.c_str()) < 0) {
    LOGLOG_ERROR(LOG4CXX_STR("unable to set thread name"));
  }
#elif defined(_WIN32)
  typedef HRESULT (WINAPI *TSetThreadDescription)(HANDLE, PCWSTR);
  static struct initialiser
  {
    HMODULE hKernelBase;
    TSetThreadDescription SetThreadDescription;
    initialiser()
      : hKernelBase(GetModuleHandleA("KernelBase.dll"))
      , SetThreadDescription(nullptr)
    {
      if (hKernelBase)
        SetThreadDescription = reinterpret_cast<TSetThreadDescription>(GetProcAddress(hKernelBase, "SetThreadDescription"));
    }
  } win32Func;
  if (win32Func.SetThreadDescription)
  {
    LOG4CXX_ENCODE_WCHAR(wthreadName, threadName);
    if(FAILED(win32Func.SetThreadDescription(static_cast<HANDLE>(nativeHandle), wthreadName.c_str())))
      LOGLOG_ERROR( LOG4CXX_STR("unable to set thread name") );
  }
#endif
}

void ThreadUtility::postThreadUnblockSignals()
{
#if LOG4CXX_HAS_PTHREAD_SIGMASK

  // Only restore the signal mask if we were able to set it in the first place.
  if ( sigmask_valid )
  {
    if ( pthread_sigmask(SIG_SETMASK, &old_mask, nullptr) < 0 )
    {
      LOGLOG_ERROR( LOG4CXX_STR("Unable to set thread sigmask") );
    }
  }

#endif /* LOG4CXX_HAS_PTHREAD_SIGMASK */
}


ThreadStartPre ThreadUtility::preStartFunction()
{
  return m_priv->start_pre;
}

ThreadStarted ThreadUtility::threadStartedFunction()
{
  return m_priv->started;
}

ThreadStartPost ThreadUtility::postStartFunction()
{
  return m_priv->start_post;
}

/**
 * Add a periodic task
 */
void ThreadUtility::addPeriodicTask(const LogString& name, std::function<void()> f, const Period& delay)
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->job_mutex);
  if (m_priv->maxDelay < delay)
    m_priv->maxDelay = delay;
  auto currentTime = std::chrono::system_clock::now();
  m_priv->jobs.push_back( priv_data::NamedPeriodicFunction{name, delay, currentTime + delay, f, 0, false} );
  if (!m_priv->thread.joinable())
  {
    m_priv->terminated = false;
    m_priv->thread = createThread(LOG4CXX_STR("log4cxx"), std::bind(&priv_data::doPeriodicTasks, m_priv.get()));
  }
  else
    m_priv->interrupt.notify_one();
}

/**
 * Is this already running a \c taskName periodic task?
 */
bool ThreadUtility::hasPeriodicTask(const LogString& name)
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->job_mutex);
  auto pItem = std::find_if(m_priv->jobs.begin(), m_priv->jobs.end()
    , [&name](const priv_data::NamedPeriodicFunction& item)
    { return !item.removed && name == item.name; }
    );
  return m_priv->jobs.end() != pItem;
}

/**
 * Remove all periodic tasks and stop the processing thread
 */
void ThreadUtility::removeAllPeriodicTasks()
{
  {
    std::lock_guard<std::recursive_mutex> lock(m_priv->job_mutex);
    while (!m_priv->jobs.empty())
      m_priv->jobs.pop_back();
  }
  m_priv->stopThread();
}

/**
 * Remove the \c taskName periodic task
 */
void ThreadUtility::removePeriodicTask(const LogString& name)
{
  std::lock_guard<std::recursive_mutex> lock(m_priv->job_mutex);
  auto pItem = std::find_if(m_priv->jobs.begin(), m_priv->jobs.end()
    , [&name](const priv_data::NamedPeriodicFunction& item)
    { return !item.removed && name == item.name; }
    );
  if (m_priv->jobs.end() != pItem)
  {
    pItem->removed = true;
    m_priv->interrupt.notify_one();
  }
}

/**
 * Remove any periodic task matching \c namePrefix
 */
void ThreadUtility::removePeriodicTasksMatching(const LogString& namePrefix)
{
  while (1)
  {
    std::lock_guard<std::recursive_mutex> lock(m_priv->job_mutex);
    auto pItem = std::find_if(m_priv->jobs.begin(), m_priv->jobs.end()
      , [&namePrefix](const priv_data::NamedPeriodicFunction& item)
      { return !item.removed && namePrefix.size() <= item.name.size() && item.name.substr(0, namePrefix.size()) == namePrefix; }
      );
    if (m_priv->jobs.end() == pItem)
      break;
    pItem->removed = true;
  }
  m_priv->interrupt.notify_one();
}

// Run ready tasks
void ThreadUtility::priv_data::doPeriodicTasks()
{
  while (!this->terminated)
  {
    auto currentTime = std::chrono::system_clock::now();
    TimePoint nextOperationTime = currentTime + this->maxDelay;
    {
      std::lock_guard<std::recursive_mutex> lock(this->job_mutex);
      for (auto& item : this->jobs)
      {
        if (this->terminated)
          return;
        if (item.removed)
          ;
        else if (item.nextRun <= currentTime)
        {
          try
          {
            item.f();
            item.nextRun = std::chrono::system_clock::now() + item.delay;
            if (item.nextRun < nextOperationTime)
              nextOperationTime = item.nextRun;
            item.errorCount = 0;
          }
          catch (std::exception& ex)
          {
            LogLog::warn(item.name, ex);
            ++item.errorCount;
          }
          catch (...)
          {
            LogLog::warn(item.name + LOG4CXX_STR(" threw an exception"));
            ++item.errorCount;
          }
        }
        else if (item.nextRun < nextOperationTime)
          nextOperationTime = item.nextRun;
      }
    }
    // Delete removed and faulty tasks
    while (1)
    {
      std::lock_guard<std::recursive_mutex> lock(this->job_mutex);
      auto pItem = std::find_if(this->jobs.begin(), this->jobs.end()
        , [this](const NamedPeriodicFunction& item)
        { return item.removed || this->retryCount < item.errorCount; }
        );
      if (this->jobs.end() == pItem)
        break;
      this->jobs.erase(pItem);
      if (this->jobs.empty())
        return;
    }

    std::unique_lock<std::mutex> lock(this->interrupt_mutex);
    this->interrupt.wait_until(lock, nextOperationTime);
  }
}

} //namespace helpers
} //namespace log4cxx

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Created: 2025-07-01 06:08