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100 lines
3.6 KiB
100 lines
3.6 KiB
/* |
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* Copyright (c) 2009-2012 Niels Provos and Nick Mathewson |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef _DEFER_INTERNAL_H_ |
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#define _DEFER_INTERNAL_H_ |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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#include "event2/event-config.h" |
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#include <sys/queue.h> |
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struct deferred_cb; |
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typedef void (*deferred_cb_fn)(struct deferred_cb *, void *); |
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/** A deferred_cb is a callback that can be scheduled to run as part of |
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* an event_base's event_loop, rather than running immediately. */ |
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struct deferred_cb { |
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/** Links to the adjacent active (pending) deferred_cb objects. */ |
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TAILQ_ENTRY (deferred_cb) cb_next; |
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/** True iff this deferred_cb is pending in an event_base. */ |
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unsigned queued : 1; |
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/** The function to execute when the callback runs. */ |
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deferred_cb_fn cb; |
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/** The function's second argument. */ |
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void *arg; |
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}; |
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/** A deferred_cb_queue is a list of deferred_cb that we can add to and run. */ |
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struct deferred_cb_queue { |
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/** Lock used to protect the queue. */ |
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void *lock; |
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/** How many entries are in the queue? */ |
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int active_count; |
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/** Function called when adding to the queue from another thread. */ |
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void (*notify_fn)(struct deferred_cb_queue *, void *); |
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void *notify_arg; |
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/** Deferred callback management: a list of deferred callbacks to |
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* run active the active events. */ |
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TAILQ_HEAD (deferred_cb_list, deferred_cb) deferred_cb_list; |
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}; |
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/** |
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Initialize an empty, non-pending deferred_cb. |
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@param deferred The deferred_cb structure to initialize. |
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@param cb The function to run when the deferred_cb executes. |
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@param arg The function's second argument. |
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*/ |
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void event_deferred_cb_init(struct deferred_cb *, deferred_cb_fn, void *); |
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/** |
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Cancel a deferred_cb if it is currently scheduled in an event_base. |
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*/ |
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void event_deferred_cb_cancel(struct deferred_cb_queue *, struct deferred_cb *); |
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/** |
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Activate a deferred_cb if it is not currently scheduled in an event_base. |
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*/ |
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void event_deferred_cb_schedule(struct deferred_cb_queue *, struct deferred_cb *); |
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#define LOCK_DEFERRED_QUEUE(q) \ |
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EVLOCK_LOCK((q)->lock, 0) |
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#define UNLOCK_DEFERRED_QUEUE(q) \ |
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EVLOCK_UNLOCK((q)->lock, 0) |
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#ifdef __cplusplus |
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} |
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#endif |
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void event_deferred_cb_queue_init(struct deferred_cb_queue *); |
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struct deferred_cb_queue *event_base_get_deferred_cb_queue(struct event_base *); |
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#endif /* _EVENT_INTERNAL_H_ */ |
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