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Copy pathosqueue.c
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68 lines (48 loc) · 976 Bytes
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#include"osqueue.h"
#include<stdlib.h>
OSQueue*osCreateQueue()
{
OSQueue*q=malloc(sizeof(OSQueue));
if(q==NULL)
returnNULL;
q->head=q->tail=NULL;
returnq;
}
voidosDestroyQueue(OSQueue*q)
{
if(q==NULL)
return;
while(osDequeue(q) !=NULL);
free(q);
}
intosIsQueueEmpty(OSQueue*q)
{
return (q->tail==NULL&&q->head==NULL);
}
voidosEnqueue(OSQueue*q, void*data)
{
OSNode*node=malloc(sizeof(OSNode));
node->data=data;
node->next=NULL;
if(q->tail==NULL)
{
q->head=q->tail=node;
return;
}
q->tail->next=node;
q->tail=node;
}
void*osDequeue(OSQueue*q)
{
OSNode*previousHead;
void*data;
previousHead=q->head;
if(previousHead==NULL)
returnNULL;
q->head=q->head->next;
if (q->head==NULL)
q->tail=NULL;
data=previousHead->data;
free(previousHead);
returndata;
}