oh_lock_histogram< H > Class Template Reference

Lock to be used for thread unsafe histogram operations. More...

#include <OHLockedHist.h>

Inheritance diagram for oh_lock_histogram< H >:

Collaboration diagram for oh_lock_histogram< H >:

Public Member Functions
	oh_lock_histogram (H *h)
	Lock. More...
H *	operator-> ()
	Access to histogram pointer. More...
	~oh_lock_histogram ()
	Unlock. More...

Static Public Member Functions
static void	set_histogram_mutex (std::mutex &mutex)
	Set mutex to be used in oh_lock_histogram. More...
static void	reset_histogram_mutex ()
	Reset (disable) histogram mutex. More...

Static Protected Attributes
static std::mutex *m_mutex	ATLAS_THREAD_SAFE

Private Member Functions
void *	operator new (size_t)
	Do not allow dynamic allocation to avoid accidental deadlocks. More...

Private Attributes
H *	m_hist

Detailed Description

template<class H>
class oh_lock_histogram< H >

Lock to be used for thread unsafe histogram operations.

The TH1::Fill and other operations may sometimes involve ROOT global variables access. This usually leads to crashes as the histogram may be accessed at the same time for OH publication.

This usually happens when histograms have labeled bins, but may also happen in other cases involving re-binning, cloning etc. For those (and only those) operations one should lock the histogram access via the OH mutex:

TH1F * myhistogram = new ....
// instead of myhistogram->Fill("blabla")
oh_lock_histogram<TH1F>(myhistogram)->Fill("blabla");

Definition at line 69 of file OHLockedHist.h.

Constructor & Destructor Documentation

oh_lock_histogram()

template<class H >

oh_lock_histogram< H >::oh_lock_histogram ( H *  h )

inline

Lock.

Definition at line 72 of file OHLockedHist.h.

                          : m_hist(h)
  {
    if (m_mutex) m_mutex->lock();
  }

~oh_lock_histogram()

template<class H >

oh_lock_histogram< H >::~oh_lock_histogram ( )

inline

Unlock.

Definition at line 81 of file OHLockedHist.h.

  {
    if (m_mutex) m_mutex->unlock();
  }

Member Function Documentation

operator new()

template<class H >

void* oh_lock_histogram< H >::operator new ( size_t  )

private

Do not allow dynamic allocation to avoid accidental deadlocks.

operator->()

template<class H >

H* oh_lock_histogram< H >::operator-> ( )

inline

Access to histogram pointer.

Definition at line 78 of file OHLockedHist.h.

{ return m_hist; }

reset_histogram_mutex()

static void oh_lock_histogram_mutex::reset_histogram_mutex ( )

inlinestaticinherited

Reset (disable) histogram mutex.

Definition at line 39 of file OHLockedHist.h.

{ m_mutex = nullptr; }

set_histogram_mutex()

static void oh_lock_histogram_mutex::set_histogram_mutex ( std::mutex &  mutex )

inlinestaticinherited

Set mutex to be used in oh_lock_histogram.

Definition at line 36 of file OHLockedHist.h.

{ m_mutex = &mutex; }

Member Data Documentation

ATLAS_THREAD_SAFE

std::mutex* m_mutex oh_lock_histogram_mutex::ATLAS_THREAD_SAFE

staticprotectedinherited

Definition at line 46 of file OHLockedHist.h.

m_hist

template<class H >

H* oh_lock_histogram< H >::m_hist

private

Definition at line 90 of file OHLockedHist.h.

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The documentation for this class was generated from the following file:

• OHLockedHist.h