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#pragma once
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/select.h>
#include <pthread.h>
/*! \defgroup osmo_it_q Inter-Thread Queue
* @{
* \file osmo_it_q.h */
/*! One instance of an inter-thread queue. The user can use this to queue messages
* between different threads. The enqueue operation is non-blocking (but of course
* grabs a mutex for the actual list operations to safeguard against races). The
* receiving thread is woken up by an event_fd which can be registered in the libosmocore
* select loop handling. */
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);
/*! @} */
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