Squashed 'third_party/libevent/' content from commit d8ceae8
Change-Id: I84e1b23561eb225b9f288717b028e6bc9e5a27e1
git-subtree-dir: third_party/libevent
git-subtree-split: d8ceae81b83f3d0a56e2f41d4c429b2702a8e302
diff --git a/bufferevent.c b/bufferevent.c
new file mode 100644
index 0000000..7518c3b
--- /dev/null
+++ b/bufferevent.c
@@ -0,0 +1,875 @@
+/*
+ * Copyright (c) 2002-2007 Niels Provos <provos@citi.umich.edu>
+ * Copyright (c) 2007-2012 Niels Provos, Nick Mathewson
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+
+#include "event2/event-config.h"
+
+#ifdef _EVENT_HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef _EVENT_HAVE_STDARG_H
+#include <stdarg.h>
+#endif
+
+#ifdef WIN32
+#include <winsock2.h>
+#endif
+#include <errno.h>
+
+#include "event2/util.h"
+#include "event2/buffer.h"
+#include "event2/buffer_compat.h"
+#include "event2/bufferevent.h"
+#include "event2/bufferevent_struct.h"
+#include "event2/bufferevent_compat.h"
+#include "event2/event.h"
+#include "log-internal.h"
+#include "mm-internal.h"
+#include "bufferevent-internal.h"
+#include "evbuffer-internal.h"
+#include "util-internal.h"
+
+static void _bufferevent_cancel_all(struct bufferevent *bev);
+
+
+void
+bufferevent_suspend_read(struct bufferevent *bufev, bufferevent_suspend_flags what)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ BEV_LOCK(bufev);
+ if (!bufev_private->read_suspended)
+ bufev->be_ops->disable(bufev, EV_READ);
+ bufev_private->read_suspended |= what;
+ BEV_UNLOCK(bufev);
+}
+
+void
+bufferevent_unsuspend_read(struct bufferevent *bufev, bufferevent_suspend_flags what)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ BEV_LOCK(bufev);
+ bufev_private->read_suspended &= ~what;
+ if (!bufev_private->read_suspended && (bufev->enabled & EV_READ))
+ bufev->be_ops->enable(bufev, EV_READ);
+ BEV_UNLOCK(bufev);
+}
+
+void
+bufferevent_suspend_write(struct bufferevent *bufev, bufferevent_suspend_flags what)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ BEV_LOCK(bufev);
+ if (!bufev_private->write_suspended)
+ bufev->be_ops->disable(bufev, EV_WRITE);
+ bufev_private->write_suspended |= what;
+ BEV_UNLOCK(bufev);
+}
+
+void
+bufferevent_unsuspend_write(struct bufferevent *bufev, bufferevent_suspend_flags what)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ BEV_LOCK(bufev);
+ bufev_private->write_suspended &= ~what;
+ if (!bufev_private->write_suspended && (bufev->enabled & EV_WRITE))
+ bufev->be_ops->enable(bufev, EV_WRITE);
+ BEV_UNLOCK(bufev);
+}
+
+
+/* Callback to implement watermarks on the input buffer. Only enabled
+ * if the watermark is set. */
+static void
+bufferevent_inbuf_wm_cb(struct evbuffer *buf,
+ const struct evbuffer_cb_info *cbinfo,
+ void *arg)
+{
+ struct bufferevent *bufev = arg;
+ size_t size;
+
+ size = evbuffer_get_length(buf);
+
+ if (size >= bufev->wm_read.high)
+ bufferevent_wm_suspend_read(bufev);
+ else
+ bufferevent_wm_unsuspend_read(bufev);
+}
+
+static void
+bufferevent_run_deferred_callbacks_locked(struct deferred_cb *_, void *arg)
+{
+ struct bufferevent_private *bufev_private = arg;
+ struct bufferevent *bufev = &bufev_private->bev;
+
+ BEV_LOCK(bufev);
+ if ((bufev_private->eventcb_pending & BEV_EVENT_CONNECTED) &&
+ bufev->errorcb) {
+ /* The "connected" happened before any reads or writes, so
+ send it first. */
+ bufev_private->eventcb_pending &= ~BEV_EVENT_CONNECTED;
+ bufev->errorcb(bufev, BEV_EVENT_CONNECTED, bufev->cbarg);
+ }
+ if (bufev_private->readcb_pending && bufev->readcb) {
+ bufev_private->readcb_pending = 0;
+ bufev->readcb(bufev, bufev->cbarg);
+ }
+ if (bufev_private->writecb_pending && bufev->writecb) {
+ bufev_private->writecb_pending = 0;
+ bufev->writecb(bufev, bufev->cbarg);
+ }
+ if (bufev_private->eventcb_pending && bufev->errorcb) {
+ short what = bufev_private->eventcb_pending;
+ int err = bufev_private->errno_pending;
+ bufev_private->eventcb_pending = 0;
+ bufev_private->errno_pending = 0;
+ EVUTIL_SET_SOCKET_ERROR(err);
+ bufev->errorcb(bufev, what, bufev->cbarg);
+ }
+ _bufferevent_decref_and_unlock(bufev);
+}
+
+static void
+bufferevent_run_deferred_callbacks_unlocked(struct deferred_cb *_, void *arg)
+{
+ struct bufferevent_private *bufev_private = arg;
+ struct bufferevent *bufev = &bufev_private->bev;
+
+ BEV_LOCK(bufev);
+#define UNLOCKED(stmt) \
+ do { BEV_UNLOCK(bufev); stmt; BEV_LOCK(bufev); } while(0)
+
+ if ((bufev_private->eventcb_pending & BEV_EVENT_CONNECTED) &&
+ bufev->errorcb) {
+ /* The "connected" happened before any reads or writes, so
+ send it first. */
+ bufferevent_event_cb errorcb = bufev->errorcb;
+ void *cbarg = bufev->cbarg;
+ bufev_private->eventcb_pending &= ~BEV_EVENT_CONNECTED;
+ UNLOCKED(errorcb(bufev, BEV_EVENT_CONNECTED, cbarg));
+ }
+ if (bufev_private->readcb_pending && bufev->readcb) {
+ bufferevent_data_cb readcb = bufev->readcb;
+ void *cbarg = bufev->cbarg;
+ bufev_private->readcb_pending = 0;
+ UNLOCKED(readcb(bufev, cbarg));
+ }
+ if (bufev_private->writecb_pending && bufev->writecb) {
+ bufferevent_data_cb writecb = bufev->writecb;
+ void *cbarg = bufev->cbarg;
+ bufev_private->writecb_pending = 0;
+ UNLOCKED(writecb(bufev, cbarg));
+ }
+ if (bufev_private->eventcb_pending && bufev->errorcb) {
+ bufferevent_event_cb errorcb = bufev->errorcb;
+ void *cbarg = bufev->cbarg;
+ short what = bufev_private->eventcb_pending;
+ int err = bufev_private->errno_pending;
+ bufev_private->eventcb_pending = 0;
+ bufev_private->errno_pending = 0;
+ EVUTIL_SET_SOCKET_ERROR(err);
+ UNLOCKED(errorcb(bufev,what,cbarg));
+ }
+ _bufferevent_decref_and_unlock(bufev);
+#undef UNLOCKED
+}
+
+#define SCHEDULE_DEFERRED(bevp) \
+ do { \
+ bufferevent_incref(&(bevp)->bev); \
+ event_deferred_cb_schedule( \
+ event_base_get_deferred_cb_queue((bevp)->bev.ev_base), \
+ &(bevp)->deferred); \
+ } while (0)
+
+
+void
+_bufferevent_run_readcb(struct bufferevent *bufev)
+{
+ /* Requires that we hold the lock and a reference */
+ struct bufferevent_private *p =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ if (bufev->readcb == NULL)
+ return;
+ if (p->options & BEV_OPT_DEFER_CALLBACKS) {
+ p->readcb_pending = 1;
+ if (!p->deferred.queued)
+ SCHEDULE_DEFERRED(p);
+ } else {
+ bufev->readcb(bufev, bufev->cbarg);
+ }
+}
+
+void
+_bufferevent_run_writecb(struct bufferevent *bufev)
+{
+ /* Requires that we hold the lock and a reference */
+ struct bufferevent_private *p =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ if (bufev->writecb == NULL)
+ return;
+ if (p->options & BEV_OPT_DEFER_CALLBACKS) {
+ p->writecb_pending = 1;
+ if (!p->deferred.queued)
+ SCHEDULE_DEFERRED(p);
+ } else {
+ bufev->writecb(bufev, bufev->cbarg);
+ }
+}
+
+void
+_bufferevent_run_eventcb(struct bufferevent *bufev, short what)
+{
+ /* Requires that we hold the lock and a reference */
+ struct bufferevent_private *p =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ if (bufev->errorcb == NULL)
+ return;
+ if (p->options & BEV_OPT_DEFER_CALLBACKS) {
+ p->eventcb_pending |= what;
+ p->errno_pending = EVUTIL_SOCKET_ERROR();
+ if (!p->deferred.queued)
+ SCHEDULE_DEFERRED(p);
+ } else {
+ bufev->errorcb(bufev, what, bufev->cbarg);
+ }
+}
+
+int
+bufferevent_init_common(struct bufferevent_private *bufev_private,
+ struct event_base *base,
+ const struct bufferevent_ops *ops,
+ enum bufferevent_options options)
+{
+ struct bufferevent *bufev = &bufev_private->bev;
+
+ if (!bufev->input) {
+ if ((bufev->input = evbuffer_new()) == NULL)
+ return -1;
+ }
+
+ if (!bufev->output) {
+ if ((bufev->output = evbuffer_new()) == NULL) {
+ evbuffer_free(bufev->input);
+ return -1;
+ }
+ }
+
+ bufev_private->refcnt = 1;
+ bufev->ev_base = base;
+
+ /* Disable timeouts. */
+ evutil_timerclear(&bufev->timeout_read);
+ evutil_timerclear(&bufev->timeout_write);
+
+ bufev->be_ops = ops;
+
+ /*
+ * Set to EV_WRITE so that using bufferevent_write is going to
+ * trigger a callback. Reading needs to be explicitly enabled
+ * because otherwise no data will be available.
+ */
+ bufev->enabled = EV_WRITE;
+
+#ifndef _EVENT_DISABLE_THREAD_SUPPORT
+ if (options & BEV_OPT_THREADSAFE) {
+ if (bufferevent_enable_locking(bufev, NULL) < 0) {
+ /* cleanup */
+ evbuffer_free(bufev->input);
+ evbuffer_free(bufev->output);
+ bufev->input = NULL;
+ bufev->output = NULL;
+ return -1;
+ }
+ }
+#endif
+ if ((options & (BEV_OPT_DEFER_CALLBACKS|BEV_OPT_UNLOCK_CALLBACKS))
+ == BEV_OPT_UNLOCK_CALLBACKS) {
+ event_warnx("UNLOCK_CALLBACKS requires DEFER_CALLBACKS");
+ return -1;
+ }
+ if (options & BEV_OPT_DEFER_CALLBACKS) {
+ if (options & BEV_OPT_UNLOCK_CALLBACKS)
+ event_deferred_cb_init(&bufev_private->deferred,
+ bufferevent_run_deferred_callbacks_unlocked,
+ bufev_private);
+ else
+ event_deferred_cb_init(&bufev_private->deferred,
+ bufferevent_run_deferred_callbacks_locked,
+ bufev_private);
+ }
+
+ bufev_private->options = options;
+
+ evbuffer_set_parent(bufev->input, bufev);
+ evbuffer_set_parent(bufev->output, bufev);
+
+ return 0;
+}
+
+void
+bufferevent_setcb(struct bufferevent *bufev,
+ bufferevent_data_cb readcb, bufferevent_data_cb writecb,
+ bufferevent_event_cb eventcb, void *cbarg)
+{
+ BEV_LOCK(bufev);
+
+ bufev->readcb = readcb;
+ bufev->writecb = writecb;
+ bufev->errorcb = eventcb;
+
+ bufev->cbarg = cbarg;
+ BEV_UNLOCK(bufev);
+}
+
+struct evbuffer *
+bufferevent_get_input(struct bufferevent *bufev)
+{
+ return bufev->input;
+}
+
+struct evbuffer *
+bufferevent_get_output(struct bufferevent *bufev)
+{
+ return bufev->output;
+}
+
+struct event_base *
+bufferevent_get_base(struct bufferevent *bufev)
+{
+ return bufev->ev_base;
+}
+
+int
+bufferevent_write(struct bufferevent *bufev, const void *data, size_t size)
+{
+ if (evbuffer_add(bufev->output, data, size) == -1)
+ return (-1);
+
+ return 0;
+}
+
+int
+bufferevent_write_buffer(struct bufferevent *bufev, struct evbuffer *buf)
+{
+ if (evbuffer_add_buffer(bufev->output, buf) == -1)
+ return (-1);
+
+ return 0;
+}
+
+size_t
+bufferevent_read(struct bufferevent *bufev, void *data, size_t size)
+{
+ return (evbuffer_remove(bufev->input, data, size));
+}
+
+int
+bufferevent_read_buffer(struct bufferevent *bufev, struct evbuffer *buf)
+{
+ return (evbuffer_add_buffer(buf, bufev->input));
+}
+
+int
+bufferevent_enable(struct bufferevent *bufev, short event)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ short impl_events = event;
+ int r = 0;
+
+ _bufferevent_incref_and_lock(bufev);
+ if (bufev_private->read_suspended)
+ impl_events &= ~EV_READ;
+ if (bufev_private->write_suspended)
+ impl_events &= ~EV_WRITE;
+
+ bufev->enabled |= event;
+
+ if (impl_events && bufev->be_ops->enable(bufev, impl_events) < 0)
+ r = -1;
+
+ _bufferevent_decref_and_unlock(bufev);
+ return r;
+}
+
+int
+bufferevent_set_timeouts(struct bufferevent *bufev,
+ const struct timeval *tv_read,
+ const struct timeval *tv_write)
+{
+ int r = 0;
+ BEV_LOCK(bufev);
+ if (tv_read) {
+ bufev->timeout_read = *tv_read;
+ } else {
+ evutil_timerclear(&bufev->timeout_read);
+ }
+ if (tv_write) {
+ bufev->timeout_write = *tv_write;
+ } else {
+ evutil_timerclear(&bufev->timeout_write);
+ }
+
+ if (bufev->be_ops->adj_timeouts)
+ r = bufev->be_ops->adj_timeouts(bufev);
+ BEV_UNLOCK(bufev);
+
+ return r;
+}
+
+
+/* Obsolete; use bufferevent_set_timeouts */
+void
+bufferevent_settimeout(struct bufferevent *bufev,
+ int timeout_read, int timeout_write)
+{
+ struct timeval tv_read, tv_write;
+ struct timeval *ptv_read = NULL, *ptv_write = NULL;
+
+ memset(&tv_read, 0, sizeof(tv_read));
+ memset(&tv_write, 0, sizeof(tv_write));
+
+ if (timeout_read) {
+ tv_read.tv_sec = timeout_read;
+ ptv_read = &tv_read;
+ }
+ if (timeout_write) {
+ tv_write.tv_sec = timeout_write;
+ ptv_write = &tv_write;
+ }
+
+ bufferevent_set_timeouts(bufev, ptv_read, ptv_write);
+}
+
+
+int
+bufferevent_disable_hard(struct bufferevent *bufev, short event)
+{
+ int r = 0;
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+
+ BEV_LOCK(bufev);
+ bufev->enabled &= ~event;
+
+ bufev_private->connecting = 0;
+ if (bufev->be_ops->disable(bufev, event) < 0)
+ r = -1;
+
+ BEV_UNLOCK(bufev);
+ return r;
+}
+
+int
+bufferevent_disable(struct bufferevent *bufev, short event)
+{
+ int r = 0;
+
+ BEV_LOCK(bufev);
+ bufev->enabled &= ~event;
+
+ if (bufev->be_ops->disable(bufev, event) < 0)
+ r = -1;
+
+ BEV_UNLOCK(bufev);
+ return r;
+}
+
+/*
+ * Sets the water marks
+ */
+
+void
+bufferevent_setwatermark(struct bufferevent *bufev, short events,
+ size_t lowmark, size_t highmark)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+
+ BEV_LOCK(bufev);
+ if (events & EV_WRITE) {
+ bufev->wm_write.low = lowmark;
+ bufev->wm_write.high = highmark;
+ }
+
+ if (events & EV_READ) {
+ bufev->wm_read.low = lowmark;
+ bufev->wm_read.high = highmark;
+
+ if (highmark) {
+ /* There is now a new high-water mark for read.
+ enable the callback if needed, and see if we should
+ suspend/bufferevent_wm_unsuspend. */
+
+ if (bufev_private->read_watermarks_cb == NULL) {
+ bufev_private->read_watermarks_cb =
+ evbuffer_add_cb(bufev->input,
+ bufferevent_inbuf_wm_cb,
+ bufev);
+ }
+ evbuffer_cb_set_flags(bufev->input,
+ bufev_private->read_watermarks_cb,
+ EVBUFFER_CB_ENABLED|EVBUFFER_CB_NODEFER);
+
+ if (evbuffer_get_length(bufev->input) >= highmark)
+ bufferevent_wm_suspend_read(bufev);
+ else if (evbuffer_get_length(bufev->input) < highmark)
+ bufferevent_wm_unsuspend_read(bufev);
+ } else {
+ /* There is now no high-water mark for read. */
+ if (bufev_private->read_watermarks_cb)
+ evbuffer_cb_clear_flags(bufev->input,
+ bufev_private->read_watermarks_cb,
+ EVBUFFER_CB_ENABLED);
+ bufferevent_wm_unsuspend_read(bufev);
+ }
+ }
+ BEV_UNLOCK(bufev);
+}
+
+int
+bufferevent_flush(struct bufferevent *bufev,
+ short iotype,
+ enum bufferevent_flush_mode mode)
+{
+ int r = -1;
+ BEV_LOCK(bufev);
+ if (bufev->be_ops->flush)
+ r = bufev->be_ops->flush(bufev, iotype, mode);
+ BEV_UNLOCK(bufev);
+ return r;
+}
+
+void
+_bufferevent_incref_and_lock(struct bufferevent *bufev)
+{
+ struct bufferevent_private *bufev_private =
+ BEV_UPCAST(bufev);
+ BEV_LOCK(bufev);
+ ++bufev_private->refcnt;
+}
+
+#if 0
+static void
+_bufferevent_transfer_lock_ownership(struct bufferevent *donor,
+ struct bufferevent *recipient)
+{
+ struct bufferevent_private *d = BEV_UPCAST(donor);
+ struct bufferevent_private *r = BEV_UPCAST(recipient);
+ if (d->lock != r->lock)
+ return;
+ if (r->own_lock)
+ return;
+ if (d->own_lock) {
+ d->own_lock = 0;
+ r->own_lock = 1;
+ }
+}
+#endif
+
+int
+_bufferevent_decref_and_unlock(struct bufferevent *bufev)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+ struct bufferevent *underlying;
+
+ EVUTIL_ASSERT(bufev_private->refcnt > 0);
+
+ if (--bufev_private->refcnt) {
+ BEV_UNLOCK(bufev);
+ return 0;
+ }
+
+ underlying = bufferevent_get_underlying(bufev);
+
+ /* Clean up the shared info */
+ if (bufev->be_ops->destruct)
+ bufev->be_ops->destruct(bufev);
+
+ /* XXX what happens if refcnt for these buffers is > 1?
+ * The buffers can share a lock with this bufferevent object,
+ * but the lock might be destroyed below. */
+ /* evbuffer will free the callbacks */
+ evbuffer_free(bufev->input);
+ evbuffer_free(bufev->output);
+
+ if (bufev_private->rate_limiting) {
+ if (bufev_private->rate_limiting->group)
+ bufferevent_remove_from_rate_limit_group_internal(bufev,0);
+ if (event_initialized(&bufev_private->rate_limiting->refill_bucket_event))
+ event_del(&bufev_private->rate_limiting->refill_bucket_event);
+ event_debug_unassign(&bufev_private->rate_limiting->refill_bucket_event);
+ mm_free(bufev_private->rate_limiting);
+ bufev_private->rate_limiting = NULL;
+ }
+
+ event_debug_unassign(&bufev->ev_read);
+ event_debug_unassign(&bufev->ev_write);
+
+ BEV_UNLOCK(bufev);
+ if (bufev_private->own_lock)
+ EVTHREAD_FREE_LOCK(bufev_private->lock,
+ EVTHREAD_LOCKTYPE_RECURSIVE);
+
+ /* Free the actual allocated memory. */
+ mm_free(((char*)bufev) - bufev->be_ops->mem_offset);
+
+ /* Release the reference to underlying now that we no longer need the
+ * reference to it. We wait this long mainly in case our lock is
+ * shared with underlying.
+ *
+ * The 'destruct' function will also drop a reference to underlying
+ * if BEV_OPT_CLOSE_ON_FREE is set.
+ *
+ * XXX Should we/can we just refcount evbuffer/bufferevent locks?
+ * It would probably save us some headaches.
+ */
+ if (underlying)
+ bufferevent_decref(underlying);
+
+ return 1;
+}
+
+int
+bufferevent_decref(struct bufferevent *bufev)
+{
+ BEV_LOCK(bufev);
+ return _bufferevent_decref_and_unlock(bufev);
+}
+
+void
+bufferevent_free(struct bufferevent *bufev)
+{
+ BEV_LOCK(bufev);
+ bufferevent_setcb(bufev, NULL, NULL, NULL, NULL);
+ _bufferevent_cancel_all(bufev);
+ _bufferevent_decref_and_unlock(bufev);
+}
+
+void
+bufferevent_incref(struct bufferevent *bufev)
+{
+ struct bufferevent_private *bufev_private =
+ EVUTIL_UPCAST(bufev, struct bufferevent_private, bev);
+
+ BEV_LOCK(bufev);
+ ++bufev_private->refcnt;
+ BEV_UNLOCK(bufev);
+}
+
+int
+bufferevent_enable_locking(struct bufferevent *bufev, void *lock)
+{
+#ifdef _EVENT_DISABLE_THREAD_SUPPORT
+ return -1;
+#else
+ struct bufferevent *underlying;
+
+ if (BEV_UPCAST(bufev)->lock)
+ return -1;
+ underlying = bufferevent_get_underlying(bufev);
+
+ if (!lock && underlying && BEV_UPCAST(underlying)->lock) {
+ lock = BEV_UPCAST(underlying)->lock;
+ BEV_UPCAST(bufev)->lock = lock;
+ BEV_UPCAST(bufev)->own_lock = 0;
+ } else if (!lock) {
+ EVTHREAD_ALLOC_LOCK(lock, EVTHREAD_LOCKTYPE_RECURSIVE);
+ if (!lock)
+ return -1;
+ BEV_UPCAST(bufev)->lock = lock;
+ BEV_UPCAST(bufev)->own_lock = 1;
+ } else {
+ BEV_UPCAST(bufev)->lock = lock;
+ BEV_UPCAST(bufev)->own_lock = 0;
+ }
+ evbuffer_enable_locking(bufev->input, lock);
+ evbuffer_enable_locking(bufev->output, lock);
+
+ if (underlying && !BEV_UPCAST(underlying)->lock)
+ bufferevent_enable_locking(underlying, lock);
+
+ return 0;
+#endif
+}
+
+int
+bufferevent_setfd(struct bufferevent *bev, evutil_socket_t fd)
+{
+ union bufferevent_ctrl_data d;
+ int res = -1;
+ d.fd = fd;
+ BEV_LOCK(bev);
+ if (bev->be_ops->ctrl)
+ res = bev->be_ops->ctrl(bev, BEV_CTRL_SET_FD, &d);
+ BEV_UNLOCK(bev);
+ return res;
+}
+
+evutil_socket_t
+bufferevent_getfd(struct bufferevent *bev)
+{
+ union bufferevent_ctrl_data d;
+ int res = -1;
+ d.fd = -1;
+ BEV_LOCK(bev);
+ if (bev->be_ops->ctrl)
+ res = bev->be_ops->ctrl(bev, BEV_CTRL_GET_FD, &d);
+ BEV_UNLOCK(bev);
+ return (res<0) ? -1 : d.fd;
+}
+
+static void
+_bufferevent_cancel_all(struct bufferevent *bev)
+{
+ union bufferevent_ctrl_data d;
+ memset(&d, 0, sizeof(d));
+ BEV_LOCK(bev);
+ if (bev->be_ops->ctrl)
+ bev->be_ops->ctrl(bev, BEV_CTRL_CANCEL_ALL, &d);
+ BEV_UNLOCK(bev);
+}
+
+short
+bufferevent_get_enabled(struct bufferevent *bufev)
+{
+ short r;
+ BEV_LOCK(bufev);
+ r = bufev->enabled;
+ BEV_UNLOCK(bufev);
+ return r;
+}
+
+struct bufferevent *
+bufferevent_get_underlying(struct bufferevent *bev)
+{
+ union bufferevent_ctrl_data d;
+ int res = -1;
+ d.ptr = NULL;
+ BEV_LOCK(bev);
+ if (bev->be_ops->ctrl)
+ res = bev->be_ops->ctrl(bev, BEV_CTRL_GET_UNDERLYING, &d);
+ BEV_UNLOCK(bev);
+ return (res<0) ? NULL : d.ptr;
+}
+
+static void
+bufferevent_generic_read_timeout_cb(evutil_socket_t fd, short event, void *ctx)
+{
+ struct bufferevent *bev = ctx;
+ _bufferevent_incref_and_lock(bev);
+ bufferevent_disable(bev, EV_READ);
+ _bufferevent_run_eventcb(bev, BEV_EVENT_TIMEOUT|BEV_EVENT_READING);
+ _bufferevent_decref_and_unlock(bev);
+}
+static void
+bufferevent_generic_write_timeout_cb(evutil_socket_t fd, short event, void *ctx)
+{
+ struct bufferevent *bev = ctx;
+ _bufferevent_incref_and_lock(bev);
+ bufferevent_disable(bev, EV_WRITE);
+ _bufferevent_run_eventcb(bev, BEV_EVENT_TIMEOUT|BEV_EVENT_WRITING);
+ _bufferevent_decref_and_unlock(bev);
+}
+
+void
+_bufferevent_init_generic_timeout_cbs(struct bufferevent *bev)
+{
+ evtimer_assign(&bev->ev_read, bev->ev_base,
+ bufferevent_generic_read_timeout_cb, bev);
+ evtimer_assign(&bev->ev_write, bev->ev_base,
+ bufferevent_generic_write_timeout_cb, bev);
+}
+
+int
+_bufferevent_del_generic_timeout_cbs(struct bufferevent *bev)
+{
+ int r1,r2;
+ r1 = event_del(&bev->ev_read);
+ r2 = event_del(&bev->ev_write);
+ if (r1<0 || r2<0)
+ return -1;
+ return 0;
+}
+
+int
+_bufferevent_generic_adj_timeouts(struct bufferevent *bev)
+{
+ const short enabled = bev->enabled;
+ struct bufferevent_private *bev_p =
+ EVUTIL_UPCAST(bev, struct bufferevent_private, bev);
+ int r1=0, r2=0;
+ if ((enabled & EV_READ) && !bev_p->read_suspended &&
+ evutil_timerisset(&bev->timeout_read))
+ r1 = event_add(&bev->ev_read, &bev->timeout_read);
+ else
+ r1 = event_del(&bev->ev_read);
+
+ if ((enabled & EV_WRITE) && !bev_p->write_suspended &&
+ evutil_timerisset(&bev->timeout_write) &&
+ evbuffer_get_length(bev->output))
+ r2 = event_add(&bev->ev_write, &bev->timeout_write);
+ else
+ r2 = event_del(&bev->ev_write);
+ if (r1 < 0 || r2 < 0)
+ return -1;
+ return 0;
+}
+
+int
+_bufferevent_add_event(struct event *ev, const struct timeval *tv)
+{
+ if (tv->tv_sec == 0 && tv->tv_usec == 0)
+ return event_add(ev, NULL);
+ else
+ return event_add(ev, tv);
+}
+
+/* For use by user programs only; internally, we should be calling
+ either _bufferevent_incref_and_lock(), or BEV_LOCK. */
+void
+bufferevent_lock(struct bufferevent *bev)
+{
+ _bufferevent_incref_and_lock(bev);
+}
+
+void
+bufferevent_unlock(struct bufferevent *bev)
+{
+ _bufferevent_decref_and_unlock(bev);
+}