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lighttpd2/include/lighttpd/waitqueue.h

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#ifndef _LIGHTTPD_WAITQUEUE_H_
#define _LIGHTTPD_WAITQUEUE_H_
#include <lighttpd/settings.h>
typedef struct liWaitQueueElem liWaitQueueElem;
typedef struct liWaitQueue liWaitQueue;
typedef void (*liWaitQueueCB) (struct ev_loop *loop, struct ev_timer *w, int revents);
struct liWaitQueueElem {
gboolean queued;
ev_tstamp ts;
liWaitQueueElem *prev;
liWaitQueueElem *next;
gpointer data;
};
struct liWaitQueue {
liWaitQueueElem *head;
liWaitQueueElem *tail;
ev_timer timer;
struct ev_loop *loop;
gdouble delay;
};
/*
* waitqueues are queues used to implement delays for certain tasks in a lightweight, non-blocking way
* they are used for io timeouts or throttling for example
* waitqueue_push, waitqueue_pop and waitqueue_remove have O(1) complexity
*/
/* initializes a waitqueue by creating and starting the ev_timer. precision is sub-seconds */
LI_API void waitqueue_init(liWaitQueue *queue, struct ev_loop *loop, liWaitQueueCB callback, gdouble delay, gpointer data);
/* stops the waitqueue. to restart it, simply call waitqueue_update */
LI_API void waitqueue_stop(liWaitQueue *queue);
/* updates the timeout of the waitqueue, you should allways call this at the end of your callback */
LI_API void waitqueue_update(liWaitQueue *queue);
/* moves the element to the end of the queue if already queued, appends it to the end otherwise */
LI_API void waitqueue_push(liWaitQueue *queue, liWaitQueueElem *elem);
/* pops the first ready! element from the queue or NULL if none ready yet. this should be called in your callback */
LI_API liWaitQueueElem *waitqueue_pop(liWaitQueue *queue);
/* pops all elements from the queue that are ready or NULL of none ready yet. returns number of elements pop()ed and saves old head in '*head' */
LI_API guint waitqueue_pop_ready(liWaitQueue *queue, liWaitQueueElem **head);
/* removes an element from the queue */
LI_API void waitqueue_remove(liWaitQueue *queue, liWaitQueueElem *elem);
/* returns the length of the queue */
LI_API guint waitqueue_length(liWaitQueue *queue);
#endif