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Diffstat (limited to 'libevent/bufferevent.c')
| -rw-r--r-- | libevent/bufferevent.c | 1036 |
1 files changed, 1036 insertions, 0 deletions
diff --git a/libevent/bufferevent.c b/libevent/bufferevent.c new file mode 100644 index 0000000..08c0486 --- /dev/null +++ b/libevent/bufferevent.c @@ -0,0 +1,1036 @@ +/* + * 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 "event2/event-config.h" +#include "evconfig-private.h" + +#include <sys/types.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 "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 "event-internal.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); +static void bufferevent_finalize_cb_(struct event_callback *evcb, void *arg_); + +void +bufferevent_suspend_read_(struct bufferevent *bufev, bufferevent_suspend_flags what) +{ + struct bufferevent_private *bufev_private = BEV_UPCAST(bufev); + 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 = BEV_UPCAST(bufev); + 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 = BEV_UPCAST(bufev); + 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 = BEV_UPCAST(bufev); + 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); +} + +/** + * Sometimes bufferevent's implementation can overrun high watermarks + * (one of examples is openssl) and in this case if the read callback + * will not handle enough data do over condition above the read + * callback will never be called again (due to suspend above). + * + * To avoid this we are scheduling read callback again here, but only + * from the user callback to avoid multiple scheduling: + * - when the data had been added to it + * - when the data had been drained from it (user specified read callback) + */ +static void bufferevent_inbuf_wm_check(struct bufferevent *bev) +{ + if (!bev->wm_read.high) + return; + if (!(bev->enabled & EV_READ)) + return; + if (evbuffer_get_length(bev->input) < bev->wm_read.high) + return; + + bufferevent_trigger(bev, EV_READ, BEV_OPT_DEFER_CALLBACKS); +} + +/* 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 event_callback *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); + bufferevent_inbuf_wm_check(bufev); + } + 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 event_callback *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)); + bufferevent_inbuf_wm_check(bufev); + } + 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 { \ + if (event_deferred_cb_schedule_( \ + (bevp)->bev.ev_base, \ + &(bevp)->deferred)) \ + bufferevent_incref_(&(bevp)->bev); \ + } while (0) + + +void +bufferevent_run_readcb_(struct bufferevent *bufev, int options) +{ + /* Requires that we hold the lock and a reference */ + struct bufferevent_private *p = BEV_UPCAST(bufev); + if (bufev->readcb == NULL) + return; + if ((p->options|options) & BEV_OPT_DEFER_CALLBACKS) { + p->readcb_pending = 1; + SCHEDULE_DEFERRED(p); + } else { + bufev->readcb(bufev, bufev->cbarg); + bufferevent_inbuf_wm_check(bufev); + } +} + +void +bufferevent_run_writecb_(struct bufferevent *bufev, int options) +{ + /* Requires that we hold the lock and a reference */ + struct bufferevent_private *p = BEV_UPCAST(bufev); + if (bufev->writecb == NULL) + return; + if ((p->options|options) & BEV_OPT_DEFER_CALLBACKS) { + p->writecb_pending = 1; + SCHEDULE_DEFERRED(p); + } else { + bufev->writecb(bufev, bufev->cbarg); + } +} + +#define BEV_TRIG_ALL_OPTS ( \ + BEV_TRIG_IGNORE_WATERMARKS| \ + BEV_TRIG_DEFER_CALLBACKS \ + ) + +void +bufferevent_trigger(struct bufferevent *bufev, short iotype, int options) +{ + bufferevent_incref_and_lock_(bufev); + bufferevent_trigger_nolock_(bufev, iotype, options&BEV_TRIG_ALL_OPTS); + bufferevent_decref_and_unlock_(bufev); +} + +void +bufferevent_run_eventcb_(struct bufferevent *bufev, short what, int options) +{ + /* Requires that we hold the lock and a reference */ + struct bufferevent_private *p = BEV_UPCAST(bufev); + if (bufev->errorcb == NULL) + return; + if ((p->options|options) & BEV_OPT_DEFER_CALLBACKS) { + p->eventcb_pending |= what; + p->errno_pending = EVUTIL_SOCKET_ERROR(); + SCHEDULE_DEFERRED(p); + } else { + bufev->errorcb(bufev, what, bufev->cbarg); + } +} + +void +bufferevent_trigger_event(struct bufferevent *bufev, short what, int options) +{ + bufferevent_incref_and_lock_(bufev); + bufferevent_run_eventcb_(bufev, what, options&BEV_TRIG_ALL_OPTS); + bufferevent_decref_and_unlock_(bufev); +} + +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) + goto err; + } + + if (!bufev->output) { + if ((bufev->output = evbuffer_new()) == NULL) + goto err; + } + + bufev_private->refcnt = 1; + bufev->ev_base = base; + + /* Disable timeouts. */ + evutil_timerclear(&bufev->timeout_read); + evutil_timerclear(&bufev->timeout_write); + + bufev->be_ops = ops; + + if (bufferevent_ratelim_init_(bufev_private)) + goto err; + + /* + * 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) + goto err; + } +#endif + if ((options & (BEV_OPT_DEFER_CALLBACKS|BEV_OPT_UNLOCK_CALLBACKS)) + == BEV_OPT_UNLOCK_CALLBACKS) { + event_warnx("UNLOCK_CALLBACKS requires DEFER_CALLBACKS"); + goto err; + } + if (options & BEV_OPT_UNLOCK_CALLBACKS) + event_deferred_cb_init_( + &bufev_private->deferred, + event_base_get_npriorities(base) / 2, + bufferevent_run_deferred_callbacks_unlocked, + bufev_private); + else + event_deferred_cb_init_( + &bufev_private->deferred, + event_base_get_npriorities(base) / 2, + 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; + +err: + if (bufev->input) { + evbuffer_free(bufev->input); + bufev->input = NULL; + } + if (bufev->output) { + evbuffer_free(bufev->output); + bufev->output = NULL; + } + return -1; +} + +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); +} + +void +bufferevent_getcb(struct bufferevent *bufev, + bufferevent_data_cb *readcb_ptr, + bufferevent_data_cb *writecb_ptr, + bufferevent_event_cb *eventcb_ptr, + void **cbarg_ptr) +{ + BEV_LOCK(bufev); + if (readcb_ptr) + *readcb_ptr = bufev->readcb; + if (writecb_ptr) + *writecb_ptr = bufev->writecb; + if (eventcb_ptr) + *eventcb_ptr = bufev->errorcb; + if (cbarg_ptr) + *cbarg_ptr = bufev->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_get_priority(const struct bufferevent *bufev) +{ + if (event_initialized(&bufev->ev_read)) { + return event_get_priority(&bufev->ev_read); + } else { + return event_base_get_npriorities(bufev->ev_base) / 2; + } +} + +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 = BEV_UPCAST(bufev); + 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; + if (r) + event_debug(("%s: cannot enable 0x%hx on %p", __func__, event, bufev)); + + 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 = BEV_UPCAST(bufev); + + 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; + if (r) + event_debug(("%s: cannot disable 0x%hx on %p", __func__, event, bufev)); + + 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 = BEV_UPCAST(bufev); + + 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_getwatermark(struct bufferevent *bufev, short events, + size_t *lowmark, size_t *highmark) +{ + if (events == EV_WRITE) { + BEV_LOCK(bufev); + if (lowmark) + *lowmark = bufev->wm_write.low; + if (highmark) + *highmark = bufev->wm_write.high; + BEV_UNLOCK(bufev); + return 0; + } + + if (events == EV_READ) { + BEV_LOCK(bufev); + if (lowmark) + *lowmark = bufev->wm_read.low; + if (highmark) + *highmark = bufev->wm_read.high; + BEV_UNLOCK(bufev); + return 0; + } + return -1; +} + +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 = BEV_UPCAST(bufev); + int n_cbs = 0; +#define MAX_CBS 16 + struct event_callback *cbs[MAX_CBS]; + + EVUTIL_ASSERT(bufev_private->refcnt > 0); + + if (--bufev_private->refcnt) { + BEV_UNLOCK(bufev); + return 0; + } + + if (bufev->be_ops->unlink) + bufev->be_ops->unlink(bufev); + + /* Okay, we're out of references. Let's finalize this once all the + * callbacks are done running. */ + cbs[0] = &bufev->ev_read.ev_evcallback; + cbs[1] = &bufev->ev_write.ev_evcallback; + cbs[2] = &bufev_private->deferred; + n_cbs = 3; + if (bufev_private->rate_limiting) { + struct event *e = &bufev_private->rate_limiting->refill_bucket_event; + if (event_initialized(e)) + cbs[n_cbs++] = &e->ev_evcallback; + } + n_cbs += evbuffer_get_callbacks_(bufev->input, cbs+n_cbs, MAX_CBS-n_cbs); + n_cbs += evbuffer_get_callbacks_(bufev->output, cbs+n_cbs, MAX_CBS-n_cbs); + + event_callback_finalize_many_(bufev->ev_base, n_cbs, cbs, + bufferevent_finalize_cb_); + +#undef MAX_CBS + BEV_UNLOCK(bufev); + + return 1; +} + +static void +bufferevent_finalize_cb_(struct event_callback *evcb, void *arg_) +{ + struct bufferevent *bufev = arg_; + struct bufferevent *underlying; + struct bufferevent_private *bufev_private = BEV_UPCAST(bufev); + + BEV_LOCK(bufev); + 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); + mm_free(bufev_private->rate_limiting); + bufev_private->rate_limiting = NULL; + } + + + 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); +} + +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 = BEV_UPCAST(bufev); + + /* XXX: now that this function is public, we might want to + * - return the count from this function + * - create a new function to atomically grab the current refcount + */ + 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); + if (res) + event_debug(("%s: cannot set fd for %p to "EV_SOCK_FMT, __func__, bev, fd)); + 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); + if (res) + event_debug(("%s: cannot get fd for %p", __func__, bev)); + BEV_UNLOCK(bev); + return (res<0) ? -1 : d.fd; +} + +enum bufferevent_options +bufferevent_get_options_(struct bufferevent *bev) +{ + struct bufferevent_private *bev_p = BEV_UPCAST(bev); + enum bufferevent_options options; + + BEV_LOCK(bev); + options = bev_p->options; + BEV_UNLOCK(bev); + return options; +} + + +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, 0); + 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, 0); + bufferevent_decref_and_unlock_(bev); +} + +void +bufferevent_init_generic_timeout_cbs_(struct bufferevent *bev) +{ + event_assign(&bev->ev_read, bev->ev_base, -1, EV_FINALIZE, + bufferevent_generic_read_timeout_cb, bev); + event_assign(&bev->ev_write, bev->ev_base, -1, EV_FINALIZE, + bufferevent_generic_write_timeout_cb, bev); +} + +int +bufferevent_generic_adj_timeouts_(struct bufferevent *bev) +{ + const short enabled = bev->enabled; + struct bufferevent_private *bev_p = BEV_UPCAST(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_generic_adj_existing_timeouts_(struct bufferevent *bev) +{ + int r = 0; + if (event_pending(&bev->ev_read, EV_READ, NULL)) { + if (evutil_timerisset(&bev->timeout_read)) { + if (bufferevent_add_event_(&bev->ev_read, &bev->timeout_read) < 0) + r = -1; + } else { + event_remove_timer(&bev->ev_read); + } + } + if (event_pending(&bev->ev_write, EV_WRITE, NULL)) { + if (evutil_timerisset(&bev->timeout_write)) { + if (bufferevent_add_event_(&bev->ev_write, &bev->timeout_write) < 0) + r = -1; + } else { + event_remove_timer(&bev->ev_write); + } + } + return r; +} + +int +bufferevent_add_event_(struct event *ev, const struct timeval *tv) +{ + if (!evutil_timerisset(tv)) + 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); +} |