it_q.h

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#pragma once
 
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/select.h>
#include <pthread.h>
 
struct osmo_it_q {
        /* entry in global list of message queues */
        struct llist_head entry;
 
        /* the actual list of user structs. HEAD: first in queue; TAIL: last in queue */
        struct llist_head list;
        /* A pthread mutex to safeguard accesses to the queue. No rwlock as we always write. */
        pthread_mutex_t mutex;
        /* Current count of messages in the queue */
        unsigned int current_length;
        /* osmo-fd wrapped eventfd */
        struct osmo_fd event_ofd;
 
        /* a user-defined name for this queue */
        const char *name;
        /* maximum permitted length of queue */
        unsigned int max_length;
        /* read call-back, called for each de-queued message */
        void (*read_cb)(struct osmo_it_q *q, struct llist_head *item);
        /* opaque data pointer passed through to call-back function */
        void *data;
};
 
struct osmo_it_q *osmo_it_q_by_name(const char *name);
 
int _osmo_it_q_enqueue(struct osmo_it_q *queue, struct llist_head *item);
#define osmo_it_q_enqueue(queue, item, member) \
        _osmo_it_q_enqueue(queue, &(item)->member)
 
struct llist_head *_osmo_it_q_dequeue(struct osmo_it_q *queue);
#define osmo_it_q_dequeue(queue, item, member) do {                     \
        struct llist_head *l = _osmo_it_q_dequeue(queue);               \
        if (!l)                                                         \
                *item = NULL;                                           \
        else                                                            \
                *item = llist_entry(l, typeof(**item), member);         \
} while (0)
 
 
struct osmo_it_q *osmo_it_q_alloc(void *ctx, const char *name, unsigned int max_length,
 
                                        void (*read_cb)(struct osmo_it_q *q, struct llist_head *item),
                                        void *data);
void osmo_it_q_destroy(struct osmo_it_q *q);
void osmo_it_q_flush(struct osmo_it_q *q);