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The Single UNIX Specification also defines conditional versions of the reader–writer locking primitives.

#include 
   
    int pthread_rwlock_tryrdlock(pthread_rwlock_t *rwlock);int pthread_rwlock_trywrlock(pthread_rwlock_t *rwlock);
   

#include 
   
    #include 
    
     struct job{    struct job *j_next;    struct job *j_prev;    pthread_t j_id;};struct queue{    struct job *q_head;    struct job *q_tail;    pthread_rwlock_t q_lock;};int queue_init(struct queue *qp){    int err;    qp->q_head=NULL;    qp->q_tail=NULL;    err=pthread_rwlock_init(&qp->q_lock,NULL);    if(err!=0)        return err;    return 0;}void job_insert(struct queue *qp, struct job *jp){    pthread_rwlock_wrlock(&qp->q_lock);    jp->j_next=qp->q_head;    jp->j-prev=NULL;    if(qp->q_head!=NULL)        qp->q_head->j_prev=jp;    else        qp->tail=jp;    qp->q_head=jp;    pthread_rwlock_unlock(&qp->q_lock);}void job_append(struct queue *qp, struct job *jp){    pthread_rwlock_wrlock(&qp->q_lock);    jp->j_next=NULL;    jp->j_prev=qp->q_tail;    if(qp->q_tail!=NULL)        qp->q_tail->j_next=jp;    else        qp->q_head=jp;    qp->q_tail=jp;    pthread_rwlock_unlock(&qp->q_lock);}void job_remove(struct queue *qp, struct job *jp){    pthread_rwlock_wrlock(&qp->q_lock);    if(jp==pq->q_head)    {        qp->q_head=jp->j_next;        if(qp->q_tail==jp)            qp->tail=NULL;        else            jp->j_next->j_prev=jp->j_prev;    }    else if(jp==qp->q_tail)    {        qp->q_tail=jp->j_prev;        jp->j_prev->j_next=jp->j_next;    }    else    {        jp->j_prev->j_next=jp->j_next;        jp->j_next->j_prev=jp->j_prev;    }    pthread_rwlock_unlock(&qp->q_lock);}struct job* job_find(struct queue *qp, pthread_t id){    struct job *jp;    if(pthread_rwlock_rdlock(&qp->q_lock)!=0)        return NULL;        for(jp=qp->q_headp;jp!=NULL;jp=jp->j_next)        if(pthread-equal(jp->j_id,id))            break;        pthread_rwlock_unlock(&qp->q_lock);    return jp;}
    
   

Using reader–writer locks

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