Demo entry 6787018

123

   

Submitted by anonymous on Apr 08, 2019 at 17:10
Language: C++. Code size: 694 Bytes.

#include <pthread.h>
struct msg {
struct msg *m_next;
/* ... more stuff here ... */
};
struct msg *workq;
pthread_cond_t qready = PTHREAD_COND_INITIALIZER;
pthread_mutex_t qlock = PTHREAD_MUTEX_INITIALIZER;
void
process_msg(void)
{
    struct msg *mp;
    for (;;) {
    pthread_mutex_lock(&qlock);
    while (workq == NULL)
        pthread_cond_wait(&qready, &qlock);
    mp = workq;
    workq = mp->m_next;
    pthread_mutex_unlock(&qlock);
    /* now process the message mp */
    }
}
void
enqueue_msg(struct msg *mp)
{
    pthread_mutex_lock(&qlock);
    mp->m_next = workq;
    workq = mp;
    pthread_mutex_unlock(&qlock);
    pthread_cond_signal(&qready);
}

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