/
semqueue.cpp
72 lines (65 loc) · 1.18 KB
/
semqueue.cpp
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#include <stdlib.h>
#include "semaphor.h"
#include "semqueue.h"
#include "kernel.h"
SemaphoreElement::SemaphoreElement(KernelSem *_semaphore)
{
semaphore = _semaphore;
next = 0;
}
SemaphoreQueue::SemaphoreQueue()
{
lock();
first = 0;
last = 0;
size = 0;
unlock();
}
SemaphoreQueue::~SemaphoreQueue()
{
lock();
SemaphoreElement *temp = first;
while(temp)
{
delete temp;
first = first->next;
temp = first;
}
first = 0;
last = 0;
unlock();
}
int SemaphoreQueue::getSize() const
{
return size;
}
void SemaphoreQueue::put(KernelSem *_semaphore)
{
lock();
//last = first ? last->next : first = new SemaphoreElement(_semaphore);
if(first == 0) first = last = new SemaphoreElement(_semaphore);
else last = last->next = new SemaphoreElement(_semaphore);
size++;
unlock();
}
KernelSem* SemaphoreQueue::get()
{
lock();
if(first == 0)
{
unlock();
return 0;
}
SemaphoreElement *temp = first;
KernelSem *semaphore = temp->semaphore;
first = first->next;
if(first == 0) last = 0;
delete temp;
size--;
unlock();
return semaphore;
}
SemaphoreElement* SemaphoreQueue::getFirst()
{
return first;
}