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/*
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _GF_EVENT_H_
#define _GF_EVENT_H_
#include <pthread.h>
#include "list.h"
struct event_pool;
struct event_ops;
struct event_slot_poll;
struct event_slot_epoll;
struct event_data {
int idx;
int gen;
} __attribute__((__packed__, __may_alias__));
typedef void (*event_handler_t)(int fd, int idx, int gen, void *data,
int poll_in, int poll_out, int poll_err,
char event_thread_exit);
#define EVENT_EPOLL_TABLES 1024
#define EVENT_EPOLL_SLOTS 1024
#define EVENT_MAX_THREADS 1024
struct event_pool {
struct event_ops *ops;
int fd;
int breaker[2];
int count;
struct event_slot_poll *reg;
struct event_slot_epoll *ereg[EVENT_EPOLL_TABLES];
int slots_used[EVENT_EPOLL_TABLES];
struct list_head poller_death;
int poller_death_sliced; /* track whether the list of fds interested
* poller_death is sliced. If yes, new thread death
* notification has to wait till the list is added
* back
*/
int poller_gen;
int used;
int changed;
pthread_mutex_t mutex;
pthread_cond_t cond;
void *evcache;
int evcache_size;
/* NOTE: Currently used only when event processing is done using
* epoll. */
int eventthreadcount; /* number of event threads to execute. */
pthread_t pollers[EVENT_MAX_THREADS]; /* poller thread_id store, and live
status */
int destroy;
int activethreadcount;
/*
* Number of threads created by auto-scaling, *in addition to* the
* configured number of threads. This is only applicable on the
* server, where we try to keep the number of threads around the number
* of bricks. In that case, the configured number is just "extra"
* threads to handle requests in excess of one per brick (including
* requests on the GlusterD connection). For clients or GlusterD, this
* number will always be zero, so the "extra" is all we have.
*
* TBD: consider auto-scaling for clients as well
*/
int auto_thread_count;
};
struct event_destroy_data {
int readfd;
struct event_pool *pool;
};
struct event_ops {
struct event_pool *(*new)(int count, int eventthreadcount);
int (*event_register)(struct event_pool *event_pool, int fd,
event_handler_t handler, void *data, int poll_in,
int poll_out, char notify_poller_death);
int (*event_select_on)(struct event_pool *event_pool, int fd, int idx,
int poll_in, int poll_out);
int (*event_unregister)(struct event_pool *event_pool, int fd, int idx);
int (*event_unregister_close)(struct event_pool *event_pool, int fd,
int idx);
int (*event_dispatch)(struct event_pool *event_pool);
int (*event_reconfigure_threads)(struct event_pool *event_pool,
int newcount);
int (*event_pool_destroy)(struct event_pool *event_pool);
int (*event_handled)(struct event_pool *event_pool, int fd, int idx,
int gen);
};
struct event_pool *
event_pool_new(int count, int eventthreadcount);
int
event_select_on(struct event_pool *event_pool, int fd, int idx, int poll_in,
int poll_out);
int
event_register(struct event_pool *event_pool, int fd, event_handler_t handler,
void *data, int poll_in, int poll_out, char notify_poller_death);
int
event_unregister(struct event_pool *event_pool, int fd, int idx);
int
event_unregister_close(struct event_pool *event_pool, int fd, int idx);
int
event_dispatch(struct event_pool *event_pool);
int
event_reconfigure_threads(struct event_pool *event_pool, int value);
int
event_pool_destroy(struct event_pool *event_pool);
int
event_dispatch_destroy(struct event_pool *event_pool);
int
event_handled(struct event_pool *event_pool, int fd, int idx, int gen);
#endif /* _GF_EVENT_H_ */
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