scoped lock and object life time

Hi,

I've created a simple pthread_mutex_lock wrapper to have a scoped lock like in boost::thread

Code:

// .h
// -----
#ifndef SCOPEDLOCK_H
#define SCOPEDLOCK_H

#include "pthread.h"
#include <boost/utility.hpp>

class ScopedLock : boost::noncopyable
{

	pthread_mutex_t& mrMutex;

public: 
	ScopedLock(pthread_mutex_t& _m);
	~ScopedLock();
};


#endif //SCOPEDLOCK_H

// .cpp
// -----
#include "ScopedLock.h"

ScopedLock::ScopedLock(pthread_mutex_t& _m)
:mrMutex(_m)
{
	pthread_mutex_lock(&mrMutex);
}

ScopedLock::~ScopedLock()
{
	pthread_mutex_unlock(&mrMutex);
}

Now , while I'm trying to re-write some code to make use of this, I'm stucking this this part:

Code:

[...]


				{
					ScopedLock sl(mPrioQueueMutex);
					boost::shared_ptr<SwarmManagerEntity> smanager(new SwarmManagerEntity(
						entity_id, *this, mrPrioQueue, PrioSet::DEFAULT_PRIO));
				}

				// put it in the pointer container

				{
					pthread_mutex_lock(mLocalSwarmManagerMapMutex);
					mLocalSwarmManagerMap.insert(
						std::make_pair<int, boost::shared_ptr<SwarmManagerEntity> >(entity_id, smanager));
					// copy the entity state from swrm to object 
					smanager->update_from_Swrm();
				}


[...]

As you see I'm creating a scope to lock mPrioQueueMutex inside. Then I'm constructing the smanager object, which I also need outside the scope.
I see 2 possibilities:

- adding a SwarmManagerEntity default ctor together with an initialize member to do two-step-construction. Then the object could be created outside the scope and initialized inside the critical section.
Thats work...

or

- I could expand the critical section to the point the smanager object isn't needed any more.
Thats bad...


Is there another solution?

Thank you in advance!