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authorVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
committerVikas Gorur <vikas@zresearch.com>2009-02-18 17:36:07 +0530
commit77adf4cd648dce41f89469dd185deec6b6b53a0b (patch)
tree02e155a5753b398ee572b45793f889b538efab6b /libglusterfs/src/event.c
parentf3b2e6580e5663292ee113c741343c8a43ee133f (diff)
Added all files
Diffstat (limited to 'libglusterfs/src/event.c')
-rw-r--r--libglusterfs/src/event.c978
1 files changed, 978 insertions, 0 deletions
diff --git a/libglusterfs/src/event.c b/libglusterfs/src/event.c
new file mode 100644
index 000000000..f2bbddd20
--- /dev/null
+++ b/libglusterfs/src/event.c
@@ -0,0 +1,978 @@
+/*
+ Copyright (c) 2008 Z RESEARCH, Inc. <http://www.zresearch.com>
+ This file is part of GlusterFS.
+
+ GlusterFS is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published
+ by the Free Software Foundation; either version 3 of the License,
+ or (at your option) any later version.
+
+ GlusterFS is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see
+ <http://www.gnu.org/licenses/>.
+*/
+
+#include <sys/poll.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#include "logging.h"
+#include "event.h"
+#include "mem-pool.h"
+
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+static int
+event_register_poll (struct event_pool *event_pool, int fd,
+ event_handler_t handler,
+ void *data, int poll_in, int poll_out);
+
+
+static int
+__flush_fd (int fd, int idx, void *data,
+ int poll_in, int poll_out, int poll_err)
+{
+ char buf[64];
+ int ret = -1;
+
+ if (!poll_in)
+ return ret;
+
+ do {
+ ret = read (fd, buf, 64);
+ if (ret == -1 && errno != EAGAIN) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "read on %d returned error (%s)",
+ fd, strerror (errno));
+ }
+ } while (ret == 64);
+
+ return ret;
+}
+
+
+static int
+__event_getindex (struct event_pool *event_pool, int fd, int idx)
+{
+ int ret = -1;
+ int i = 0;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ if (idx > -1 && idx < event_pool->used) {
+ if (event_pool->reg[idx].fd == fd)
+ ret = idx;
+ }
+
+ for (i=0; ret == -1 && i<event_pool->used; i++) {
+ if (event_pool->reg[i].fd == fd) {
+ ret = i;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+
+static struct event_pool *
+event_pool_new_poll (int count)
+{
+ struct event_pool *event_pool = NULL;
+ int ret = -1;
+
+ event_pool = CALLOC (1, sizeof (*event_pool));
+
+ if (!event_pool)
+ return NULL;
+
+ event_pool->count = count;
+ event_pool->reg = CALLOC (event_pool->count,
+ sizeof (*event_pool->reg));
+
+ if (!event_pool->reg) {
+ gf_log ("poll", GF_LOG_CRITICAL,
+ "failed to allocate event registry");
+ free (event_pool);
+ return NULL;
+ }
+
+ pthread_mutex_init (&event_pool->mutex, NULL);
+
+ ret = pipe (event_pool->breaker);
+
+ if (ret == -1) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "pipe creation failed (%s)", strerror (errno));
+ free (event_pool->reg);
+ free (event_pool);
+ return NULL;
+ }
+
+ ret = fcntl (event_pool->breaker[0], F_SETFL, O_NONBLOCK);
+ if (ret == -1) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "could not set pipe to non blocking mode (%s)",
+ strerror (errno));
+ close (event_pool->breaker[0]);
+ close (event_pool->breaker[1]);
+ event_pool->breaker[0] = event_pool->breaker[1] = -1;
+
+ free (event_pool->reg);
+ free (event_pool);
+ return NULL;
+ }
+
+ ret = fcntl (event_pool->breaker[1], F_SETFL, O_NONBLOCK);
+ if (ret == -1) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "could not set pipe to non blocking mode (%s)",
+ strerror (errno));
+
+ close (event_pool->breaker[0]);
+ close (event_pool->breaker[1]);
+ event_pool->breaker[0] = event_pool->breaker[1] = -1;
+
+ free (event_pool->reg);
+ free (event_pool);
+ return NULL;
+ }
+
+ ret = event_register_poll (event_pool, event_pool->breaker[0],
+ __flush_fd, NULL, 1, 0);
+ if (ret == -1) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "could not register pipe fd with poll event loop");
+ close (event_pool->breaker[0]);
+ close (event_pool->breaker[1]);
+ event_pool->breaker[0] = event_pool->breaker[1] = -1;
+
+ free (event_pool->reg);
+ free (event_pool);
+ return NULL;
+ }
+
+ return event_pool;
+}
+
+
+static int
+event_register_poll (struct event_pool *event_pool, int fd,
+ event_handler_t handler,
+ void *data, int poll_in, int poll_out)
+{
+ int idx = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ if (event_pool->count == event_pool->used)
+ {
+ event_pool->count += 256;
+
+ event_pool->reg = realloc (event_pool->reg,
+ event_pool->count *
+ sizeof (*event_pool->reg));
+ }
+
+ idx = event_pool->used++;
+
+ event_pool->reg[idx].fd = fd;
+ event_pool->reg[idx].events = POLLPRI;
+ event_pool->reg[idx].handler = handler;
+ event_pool->reg[idx].data = data;
+
+ switch (poll_in) {
+ case 1:
+ event_pool->reg[idx].events |= POLLIN;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~POLLIN;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ gf_log ("poll", GF_LOG_ERROR,
+ "invalid poll_in value %d", poll_in);
+ break;
+ }
+
+ switch (poll_out) {
+ case 1:
+ event_pool->reg[idx].events |= POLLOUT;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~POLLOUT;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ gf_log ("poll", GF_LOG_ERROR,
+ "invalid poll_out value %d", poll_in);
+ break;
+ }
+
+ event_pool->changed = 1;
+
+ }
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ return idx;
+}
+
+
+static int
+event_unregister_poll (struct event_pool *event_pool, int fd, int idx_hint)
+{
+ int idx = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ idx = __event_getindex (event_pool, fd, idx_hint);
+
+ if (idx == -1) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "index not found for fd=%d (idx_hint=%d)",
+ fd, idx_hint);
+ errno = ENOENT;
+ goto unlock;
+ }
+
+ event_pool->reg[idx] = event_pool->reg[--event_pool->used];
+ event_pool->changed = 1;
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ return idx;
+}
+
+
+static int
+event_select_on_poll (struct event_pool *event_pool, int fd, int idx_hint,
+ int poll_in, int poll_out)
+{
+ int idx = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ idx = __event_getindex (event_pool, fd, idx_hint);
+
+ if (idx == -1) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "index not found for fd=%d (idx_hint=%d)",
+ fd, idx_hint);
+ errno = ENOENT;
+ goto unlock;
+ }
+
+ switch (poll_in) {
+ case 1:
+ event_pool->reg[idx].events |= POLLIN;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~POLLIN;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ /* TODO: log error */
+ break;
+ }
+
+ switch (poll_out) {
+ case 1:
+ event_pool->reg[idx].events |= POLLOUT;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~POLLOUT;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ /* TODO: log error */
+ break;
+ }
+
+ if (poll_in + poll_out > -2)
+ event_pool->changed = 1;
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ return idx;
+}
+
+
+static int
+event_dispatch_poll_handler (struct event_pool *event_pool,
+ struct pollfd *ufds, int i)
+{
+ event_handler_t handler = NULL;
+ void *data = NULL;
+ int idx = -1;
+ int ret = 0;
+
+ handler = NULL;
+ data = NULL;
+ idx = -1;
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ idx = __event_getindex (event_pool, ufds[i].fd, i);
+
+ if (idx == -1) {
+ gf_log ("poll", GF_LOG_ERROR,
+ "index not found for fd=%d (idx_hint=%d)",
+ ufds[i].fd, i);
+ goto unlock;
+ }
+
+ handler = event_pool->reg[idx].handler;
+ data = event_pool->reg[idx].data;
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ if (handler)
+ ret = handler (ufds[i].fd, idx, data,
+ (ufds[i].revents & (POLLIN|POLLPRI)),
+ (ufds[i].revents & (POLLOUT)),
+ (ufds[i].revents & (POLLERR|POLLHUP|POLLNVAL)));
+
+ return ret;
+}
+
+
+static int
+event_dispatch_poll_resize (struct event_pool *event_pool,
+ struct pollfd *ufds, int size)
+{
+ int i = 0;
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ if (event_pool->changed == 0) {
+ goto unlock;
+ }
+
+ if (event_pool->used > event_pool->evcache_size) {
+ if (event_pool->evcache)
+ free (event_pool->evcache);
+
+ event_pool->evcache = ufds = NULL;
+
+ event_pool->evcache_size = event_pool->used;
+
+ ufds = CALLOC (sizeof (struct pollfd),
+ event_pool->evcache_size);
+ event_pool->evcache = ufds;
+ }
+
+ for (i = 0; i < event_pool->used; i++) {
+ ufds[i].fd = event_pool->reg[i].fd;
+ ufds[i].events = event_pool->reg[i].events;
+ ufds[i].revents = 0;
+ }
+
+ size = i;
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ return size;
+}
+
+
+static int
+event_dispatch_poll (struct event_pool *event_pool)
+{
+ struct pollfd *ufds = NULL;
+ int size = 0;
+ int i = 0;
+ int ret = -1;
+
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ while (1) {
+ size = event_dispatch_poll_resize (event_pool, ufds, size);
+ ufds = event_pool->evcache;
+
+ ret = poll (ufds, size, 1);
+
+ if (ret == 0)
+ /* timeout */
+ continue;
+
+ if (ret == -1 && errno == EINTR)
+ /* sys call */
+ continue;
+
+ for (i = 0; i < size; i++) {
+ if (!ufds[i].revents)
+ continue;
+
+ event_dispatch_poll_handler (event_pool, ufds, i);
+ }
+ }
+
+ return -1;
+}
+
+
+static struct event_ops event_ops_poll = {
+ .new = event_pool_new_poll,
+ .event_register = event_register_poll,
+ .event_select_on = event_select_on_poll,
+ .event_unregister = event_unregister_poll,
+ .event_dispatch = event_dispatch_poll
+};
+
+
+
+#ifdef HAVE_SYS_EPOLL_H
+#include <sys/epoll.h>
+
+
+static struct event_pool *
+event_pool_new_epoll (int count)
+{
+ struct event_pool *event_pool = NULL;
+ int epfd = -1;
+
+ event_pool = CALLOC (1, sizeof (*event_pool));
+
+ if (!event_pool)
+ return NULL;
+
+ event_pool->count = count;
+ event_pool->reg = CALLOC (event_pool->count,
+ sizeof (*event_pool->reg));
+
+ if (!event_pool->reg) {
+ gf_log ("epoll", GF_LOG_CRITICAL,
+ "event registry allocation failed");
+ free (event_pool);
+ return NULL;
+ }
+
+ epfd = epoll_create (count);
+
+ if (epfd == -1) {
+ gf_log ("epoll", GF_LOG_ERROR, "epoll fd creation failed (%s)",
+ strerror (errno));
+ free (event_pool->reg);
+ free (event_pool);
+ return NULL;
+ }
+
+ event_pool->fd = epfd;
+
+ event_pool->count = count;
+
+ pthread_mutex_init (&event_pool->mutex, NULL);
+ pthread_cond_init (&event_pool->cond, NULL);
+
+ return event_pool;
+}
+
+
+int
+event_register_epoll (struct event_pool *event_pool, int fd,
+ event_handler_t handler,
+ void *data, int poll_in, int poll_out)
+{
+ int idx = -1;
+ int ret = -1;
+ struct epoll_event epoll_event = {0, };
+ struct event_data *ev_data = (void *)&epoll_event.data;
+
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ if (event_pool->count == event_pool->used) {
+ event_pool->count *= 2;
+
+ event_pool->reg = realloc (event_pool->reg,
+ event_pool->count *
+ sizeof (*event_pool->reg));
+
+ if (!event_pool->reg) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "event registry re-allocation failed");
+ goto unlock;
+ }
+ }
+
+ idx = event_pool->used;
+ event_pool->used++;
+
+ event_pool->reg[idx].fd = fd;
+ event_pool->reg[idx].events = EPOLLPRI;
+ event_pool->reg[idx].handler = handler;
+ event_pool->reg[idx].data = data;
+
+ switch (poll_in) {
+ case 1:
+ event_pool->reg[idx].events |= EPOLLIN;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~EPOLLIN;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ gf_log ("epoll", GF_LOG_ERROR,
+ "invalid poll_in value %d", poll_in);
+ break;
+ }
+
+ switch (poll_out) {
+ case 1:
+ event_pool->reg[idx].events |= EPOLLOUT;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~EPOLLOUT;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ gf_log ("epoll", GF_LOG_ERROR,
+ "invalid poll_out value %d", poll_in);
+ break;
+ }
+
+ event_pool->changed = 1;
+
+ epoll_event.events = event_pool->reg[idx].events;
+ ev_data->fd = fd;
+ ev_data->idx = idx;
+
+ ret = epoll_ctl (event_pool->fd, EPOLL_CTL_ADD, fd,
+ &epoll_event);
+
+ if (ret == -1) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "failed to add fd(=%d) to epoll fd(=%d) (%s)",
+ fd, event_pool->fd, strerror (errno));
+ goto unlock;
+ }
+
+ pthread_cond_broadcast (&event_pool->cond);
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ return ret;
+}
+
+
+static int
+event_unregister_epoll (struct event_pool *event_pool, int fd, int idx_hint)
+{
+ int idx = -1;
+ int ret = -1;
+
+ struct epoll_event epoll_event = {0, };
+ struct event_data *ev_data = (void *)&epoll_event.data;
+ int lastidx = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ idx = __event_getindex (event_pool, fd, idx_hint);
+
+ if (idx == -1) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "index not found for fd=%d (idx_hint=%d)",
+ fd, idx_hint);
+ errno = ENOENT;
+ goto unlock;
+ }
+
+ ret = epoll_ctl (event_pool->fd, EPOLL_CTL_DEL, fd, NULL);
+
+ /* if ret is -1, this array member should never be accessed */
+ /* if it is 0, the array member might be used by idx_cache
+ * in which case the member should not be accessed till
+ * it is reallocated
+ */
+
+ event_pool->reg[idx].fd = -1;
+
+ if (ret == -1) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "fail to del fd(=%d) from epoll fd(=%d) (%s)",
+ fd, event_pool->fd, strerror (errno));
+ goto unlock;
+ }
+
+ lastidx = event_pool->used - 1;
+ if (lastidx == idx) {
+ event_pool->used--;
+ goto unlock;
+ }
+
+ epoll_event.events = event_pool->reg[lastidx].events;
+ ev_data->fd = event_pool->reg[lastidx].fd;
+ ev_data->idx = idx;
+
+ ret = epoll_ctl (event_pool->fd, EPOLL_CTL_MOD, ev_data->fd,
+ &epoll_event);
+ if (ret == -1) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "fail to modify fd(=%d) index %d to %d (%s)",
+ ev_data->fd, event_pool->used, idx,
+ strerror (errno));
+ goto unlock;
+ }
+
+ /* just replace the unregistered idx by last one */
+ event_pool->reg[idx] = event_pool->reg[lastidx];
+ event_pool->used--;
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ return ret;
+}
+
+
+static int
+event_select_on_epoll (struct event_pool *event_pool, int fd, int idx_hint,
+ int poll_in, int poll_out)
+{
+ int idx = -1;
+ int ret = -1;
+
+ struct epoll_event epoll_event = {0, };
+ struct event_data *ev_data = (void *)&epoll_event.data;
+
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ idx = __event_getindex (event_pool, fd, idx_hint);
+
+ if (idx == -1) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "index not found for fd=%d (idx_hint=%d)",
+ fd, idx_hint);
+ errno = ENOENT;
+ goto unlock;
+ }
+
+ switch (poll_in) {
+ case 1:
+ event_pool->reg[idx].events |= EPOLLIN;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~EPOLLIN;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ gf_log ("epoll", GF_LOG_ERROR,
+ "invalid poll_in value %d", poll_in);
+ break;
+ }
+
+ switch (poll_out) {
+ case 1:
+ event_pool->reg[idx].events |= EPOLLOUT;
+ break;
+ case 0:
+ event_pool->reg[idx].events &= ~EPOLLOUT;
+ break;
+ case -1:
+ /* do nothing */
+ break;
+ default:
+ gf_log ("epoll", GF_LOG_ERROR,
+ "invalid poll_out value %d", poll_in);
+ break;
+ }
+
+ epoll_event.events = event_pool->reg[idx].events;
+ ev_data->fd = fd;
+ ev_data->idx = idx;
+
+ ret = epoll_ctl (event_pool->fd, EPOLL_CTL_MOD, fd,
+ &epoll_event);
+ if (ret == -1) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "failed to modify fd(=%d) events to %d",
+ fd, epoll_event.events);
+ }
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ return ret;
+}
+
+
+static int
+event_dispatch_epoll_handler (struct event_pool *event_pool,
+ struct epoll_event *events, int i)
+{
+ struct event_data *event_data = NULL;
+ event_handler_t handler = NULL;
+ void *data = NULL;
+ int idx = -1;
+ int ret = -1;
+
+
+ event_data = (void *)&events[i].data;
+ handler = NULL;
+ data = NULL;
+ idx = -1;
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ idx = __event_getindex (event_pool, event_data->fd,
+ event_data->idx);
+
+ if (idx == -1) {
+ gf_log ("epoll", GF_LOG_ERROR,
+ "index not found for fd(=%d) (idx_hint=%d)",
+ event_data->fd, event_data->idx);
+ goto unlock;
+ }
+
+ handler = event_pool->reg[idx].handler;
+ data = event_pool->reg[idx].data;
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ if (handler)
+ ret = handler (event_data->fd, event_data->idx, data,
+ (events[i].events & (EPOLLIN|EPOLLPRI)),
+ (events[i].events & (EPOLLOUT)),
+ (events[i].events & (EPOLLERR|EPOLLHUP)));
+ return ret;
+}
+
+
+static int
+event_dispatch_epoll (struct event_pool *event_pool)
+{
+ struct epoll_event *events = NULL;
+ int size = 0;
+ int i = 0;
+ int ret = -1;
+
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ while (1) {
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ while (event_pool->used == 0)
+ pthread_cond_wait (&event_pool->cond,
+ &event_pool->mutex);
+
+ if (event_pool->used > event_pool->evcache_size) {
+ if (event_pool->evcache)
+ free (event_pool->evcache);
+
+ event_pool->evcache = events = NULL;
+
+ event_pool->evcache_size =
+ event_pool->used + 256;
+
+ events = CALLOC (event_pool->evcache_size,
+ sizeof (struct epoll_event));
+
+ event_pool->evcache = events;
+ }
+ }
+ pthread_mutex_unlock (&event_pool->mutex);
+
+ ret = epoll_wait (event_pool->fd, event_pool->evcache,
+ event_pool->evcache_size, -1);
+
+ if (ret == 0)
+ /* timeout */
+ continue;
+
+ if (ret == -1 && errno == EINTR)
+ /* sys call */
+ continue;
+
+ size = ret;
+
+ for (i = 0; i < size; i++) {
+ if (!events[i].events)
+ continue;
+
+ ret = event_dispatch_epoll_handler (event_pool,
+ events, i);
+ }
+ }
+
+ return -1;
+}
+
+
+static struct event_ops event_ops_epoll = {
+ .new = event_pool_new_epoll,
+ .event_register = event_register_epoll,
+ .event_select_on = event_select_on_epoll,
+ .event_unregister = event_unregister_epoll,
+ .event_dispatch = event_dispatch_epoll
+};
+
+#endif
+
+
+struct event_pool *
+event_pool_new (int count)
+{
+ struct event_pool *event_pool = NULL;
+
+#ifdef HAVE_SYS_EPOLL_H
+ event_pool = event_ops_epoll.new (count);
+
+ if (event_pool) {
+ event_pool->ops = &event_ops_epoll;
+ } else {
+ gf_log ("event", GF_LOG_WARNING,
+ "failing back to poll based event handling");
+ }
+#endif
+
+ if (!event_pool) {
+ event_pool = event_ops_poll.new (count);
+
+ if (event_pool)
+ event_pool->ops = &event_ops_poll;
+ }
+
+ return event_pool;
+}
+
+
+int
+event_register (struct event_pool *event_pool, int fd,
+ event_handler_t handler,
+ void *data, int poll_in, int poll_out)
+{
+ int ret = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ ret = event_pool->ops->event_register (event_pool, fd, handler, data,
+ poll_in, poll_out);
+ return ret;
+}
+
+
+int
+event_unregister (struct event_pool *event_pool, int fd, int idx)
+{
+ int ret = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ ret = event_pool->ops->event_unregister (event_pool, fd, idx);
+
+ return ret;
+}
+
+
+int
+event_select_on (struct event_pool *event_pool, int fd, int idx_hint,
+ int poll_in, int poll_out)
+{
+ int ret = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ ret = event_pool->ops->event_select_on (event_pool, fd, idx_hint,
+ poll_in, poll_out);
+ return ret;
+}
+
+
+int
+event_dispatch (struct event_pool *event_pool)
+{
+ int ret = -1;
+
+ if (event_pool == NULL) {
+ gf_log ("event", GF_LOG_ERROR, "invalid argument");
+ return -1;
+ }
+
+ ret = event_pool->ops->event_dispatch (event_pool);
+
+ return ret;
+}