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-rw-r--r--libglusterfs/src/event-poll.c451
1 files changed, 451 insertions, 0 deletions
diff --git a/libglusterfs/src/event-poll.c b/libglusterfs/src/event-poll.c
new file mode 100644
index 00000000000..7f7f560d086
--- /dev/null
+++ b/libglusterfs/src/event-poll.c
@@ -0,0 +1,451 @@
+/*
+ Copyright (c) 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.
+*/
+
+#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"
+#include "common-utils.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;
+
+ GF_VALIDATE_OR_GOTO ("event", event_pool, out);
+
+ 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;
+ }
+ }
+
+out:
+ return ret;
+}
+
+
+static struct event_pool *
+event_pool_new_poll (int count)
+{
+ struct event_pool *event_pool = NULL;
+ int ret = -1;
+
+ event_pool = GF_CALLOC (1, sizeof (*event_pool),
+ gf_common_mt_event_pool);
+
+ if (!event_pool)
+ return NULL;
+
+ event_pool->count = count;
+ event_pool->reg = GF_CALLOC (event_pool->count,
+ sizeof (*event_pool->reg),
+ gf_common_mt_reg);
+
+ if (!event_pool->reg) {
+ GF_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));
+ GF_FREE (event_pool->reg);
+ GF_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;
+
+ GF_FREE (event_pool->reg);
+ GF_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;
+
+ GF_FREE (event_pool->reg);
+ GF_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;
+
+ GF_FREE (event_pool->reg);
+ GF_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;
+
+ GF_VALIDATE_OR_GOTO ("event", event_pool, out);
+
+ pthread_mutex_lock (&event_pool->mutex);
+ {
+ if (event_pool->count == event_pool->used)
+ {
+ event_pool->count += 256;
+
+ event_pool->reg = GF_REALLOC (event_pool->reg,
+ event_pool->count *
+ sizeof (*event_pool->reg));
+ if (!event_pool->reg)
+ goto unlock;
+ }
+
+ 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_out);
+ break;
+ }
+
+ event_pool->changed = 1;
+
+ }
+unlock:
+ pthread_mutex_unlock (&event_pool->mutex);
+
+out:
+ return idx;
+}
+
+
+static int
+event_unregister_poll (struct event_pool *event_pool, int fd, int idx_hint)
+{
+ int idx = -1;
+
+ GF_VALIDATE_OR_GOTO ("event", event_pool, out);
+
+ 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);
+
+out:
+ 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;
+
+ GF_VALIDATE_OR_GOTO ("event", event_pool, out);
+
+ 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);
+
+out:
+ 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;
+
+ 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) {
+ GF_FREE (event_pool->evcache);
+
+ event_pool->evcache = ufds = NULL;
+
+ event_pool->evcache_size = event_pool->used;
+
+ ufds = GF_CALLOC (sizeof (struct pollfd),
+ event_pool->evcache_size,
+ gf_common_mt_pollfd);
+ if (!ufds)
+ goto unlock;
+ 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;
+
+ GF_VALIDATE_OR_GOTO ("event", event_pool, out);
+
+ 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);
+ }
+ }
+
+out:
+ return -1;
+}
+
+
+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
+};
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