#include <UT_DoubleLock.h>

Inheritance diagram for UT_DoubleLock< T, LOCK_T >:

Public Member Functions
	UT_DoubleLock (LOCK_T &lock, volatile T &val)

	~UT_DoubleLock ()

T	getValue ()

void	setValue (T val)

void	abort ()

Detailed Description

template<typename T, typename LOCK_T = UT_Lock>
class UT_DoubleLock< T, LOCK_T >

A double-checked lock. Only locks the thread lock when the value is 0.

To use this lock:

static UT_Lock theLock; static OBJECT *theObj = 0;

OBJECT * getSingleton() { UT_DoubleLock<OBJECT *> lock(theLock, theObj);

if (!lock.getValue()) { // NOTE: This doesn't set theObj. theObj is set when // destructing lock. lock.setValue(new OBJECT()); } return lock.getValue(); }

NOTE: DO NOT roll your own double checked lock! If you don't know when to use which memory fences and why, odds are high that your custom implementation will be thread-unsafe.

For simple singleton initialization, consider using UT_Singleton.

Examples:: packedshareddata/GU_PackedSharedData.C.

Definition at line 50 of file UT_DoubleLock.h.