Ticket #2219: boost_bug.txt

#include <iostream>
#include <boost/shared_ptr.hpp>
#include <boost/bind.hpp>
#include <boost/thread/condition.hpp>
#include <boost/thread/recursive_mutex.hpp>
#include <boost/thread/thread.hpp>

//---------------------------------------------------------------------------

class Activity {
public:
  virtual ~Activity();
  virtual void Execute();

protected:
  virtual void PerformActivity();

private:
  void DoWork();
  void SetStarted();
  void SyncStart();

  boost::recursive_mutex           m_MutexState;
  boost::condition                 m_ConditionState;

  bool                             m_IsStarted;  // must use mutex to access

  boost::shared_ptr<boost::thread> m_ActivityThread;
};

//---------------------------------------------------------------------------

Activity::~Activity()
{
}

//---------------------------------------------------------------------------

void Activity::DoWork()
{
  SetStarted();

  // additional code removed for brevity
}

//---------------------------------------------------------------------------

// virtual
void Activity::Execute()
{
  boost::recursive_mutex::scoped_lock lock(m_MutexState);

  m_IsStarted = false;
  m_ActivityThread.reset(new boost::thread(boost::bind(&Activity::DoWork, this)));

  SyncStart();
}

//---------------------------------------------------------------------------

void Activity::PerformActivity()
{
  std::cout << "Hello world!";
}

//---------------------------------------------------------------------------

void Activity::SetStarted()
{
  // Thread 2 deadlocks here
  boost::recursive_mutex::scoped_lock lock(m_MutexState);

  m_IsStarted = true;
  m_ConditionState.notify_all();
}

//---------------------------------------------------------------------------

void Activity::SyncStart()
{
  boost::recursive_mutex::scoped_lock lock(m_MutexState);

  while (!m_IsStarted) {
    // Thread 1 deadlocks here
    m_ConditionState.wait(lock);
  }
}

//---------------------------------------------------------------------------

int main()
{
  Activity activity;

  activity.Execute();
}