Help with Semaphores/Locks

[gauchoking11]

To make it clear I am a student with a question and have read the Posting Guidelines, here is what I have written:
It is contained within a file called synch.cc
Lock::Lock(char* debugName)
{
name = debugName;
lockHolder = NULL; // no thread yet holds lock
Semaphore(name, 1);

}


Lock::~Lock()
{
delete lockHolder;

}

void Lock::Acquire()
{

IntStatus oldLevel = interrupt->SetLevel(IntOff);
semaphore->P();


(void) interrupt->SetLevel(oldLevel);
}

void Lock::Release()
{

IntStatus oldLevel = interrupt->SetLevel(IntOff);

ASSERT(isHeldByCurrentThread());
if(isHeldByCurrentThread())
{
semaphore->V();
}
(void) interrupt->SetLevel(IntOff);

}

bool Lock::isHeldByCurrentThread()
{
IntStatus oldLevel = interrupt->SetLevel(IntOff);
if(currentThread == lockHolder)
return true;
(void) interrupt->SetLevel(oldLevel);

}

and I added this to the synch.h under the class lock private section

Semaphore *semaphore;

when I run a test on the code it gives me a segmentation error(core dumped) I am stuck and don't know what to do any thoughts?

[weaknessforcats]

Are you trying to use this semaphore within a single process ??

If so, then where are your critical sections ??

[gauchoking11]

Are you trying to use this semaphore within a single process ??

If so, then where are your critical sections ??

No I am trying to manage threads. Would it help to see the semaphore code that was given to us?