ipc/chromium/src/third_party/libevent/defer-internal.h@6474c204b198 (annotated)
ipc/chromium/src/third_party/libevent/defer-internal.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (c) 2009-2012 Niels Provos and Nick Mathewson |
| michael@0 | 3 | * |
| michael@0 | 4 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | * modification, are permitted provided that the following conditions |
| michael@0 | 6 | * are met: |
| michael@0 | 7 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 8 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 10 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 11 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 12 | * 3. The name of the author may not be used to endorse or promote products |
| michael@0 | 13 | * derived from this software without specific prior written permission. |
| michael@0 | 14 | * |
| michael@0 | 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| michael@0 | 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| michael@0 | 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| michael@0 | 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| michael@0 | 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| michael@0 | 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| michael@0 | 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| michael@0 | 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| michael@0 | 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 25 | */ |
| michael@0 | 26 | #ifndef _DEFER_INTERNAL_H_ |
| michael@0 | 27 | #define _DEFER_INTERNAL_H_ |
| michael@0 | 28 | |
| michael@0 | 29 | #ifdef __cplusplus |
| michael@0 | 30 | extern "C" { |
| michael@0 | 31 | #endif |
| michael@0 | 32 | |
| michael@0 | 33 | #include "event2/event-config.h" |
| michael@0 | 34 | #include <sys/queue.h> |
| michael@0 | 35 | |
| michael@0 | 36 | struct deferred_cb; |
| michael@0 | 37 | |
| michael@0 | 38 | typedef void (*deferred_cb_fn)(struct deferred_cb *, void *); |
| michael@0 | 39 | |
| michael@0 | 40 | /** A deferred_cb is a callback that can be scheduled to run as part of |
| michael@0 | 41 | * an event_base's event_loop, rather than running immediately. */ |
| michael@0 | 42 | struct deferred_cb { |
| michael@0 | 43 | /** Links to the adjacent active (pending) deferred_cb objects. */ |
| michael@0 | 44 | TAILQ_ENTRY (deferred_cb) cb_next; |
| michael@0 | 45 | /** True iff this deferred_cb is pending in an event_base. */ |
| michael@0 | 46 | unsigned queued : 1; |
| michael@0 | 47 | /** The function to execute when the callback runs. */ |
| michael@0 | 48 | deferred_cb_fn cb; |
| michael@0 | 49 | /** The function's second argument. */ |
| michael@0 | 50 | void *arg; |
| michael@0 | 51 | }; |
| michael@0 | 52 | |
| michael@0 | 53 | /** A deferred_cb_queue is a list of deferred_cb that we can add to and run. */ |
| michael@0 | 54 | struct deferred_cb_queue { |
| michael@0 | 55 | /** Lock used to protect the queue. */ |
| michael@0 | 56 | void *lock; |
| michael@0 | 57 | |
| michael@0 | 58 | /** How many entries are in the queue? */ |
| michael@0 | 59 | int active_count; |
| michael@0 | 60 | |
| michael@0 | 61 | /** Function called when adding to the queue from another thread. */ |
| michael@0 | 62 | void (*notify_fn)(struct deferred_cb_queue *, void *); |
| michael@0 | 63 | void *notify_arg; |
| michael@0 | 64 | |
| michael@0 | 65 | /** Deferred callback management: a list of deferred callbacks to |
| michael@0 | 66 | * run active the active events. */ |
| michael@0 | 67 | TAILQ_HEAD (deferred_cb_list, deferred_cb) deferred_cb_list; |
| michael@0 | 68 | }; |
| michael@0 | 69 | |
| michael@0 | 70 | /** |
| michael@0 | 71 | Initialize an empty, non-pending deferred_cb. |
| michael@0 | 72 | |
| michael@0 | 73 | @param deferred The deferred_cb structure to initialize. |
| michael@0 | 74 | @param cb The function to run when the deferred_cb executes. |
| michael@0 | 75 | @param arg The function's second argument. |
| michael@0 | 76 | */ |
| michael@0 | 77 | void event_deferred_cb_init(struct deferred_cb *, deferred_cb_fn, void *); |
| michael@0 | 78 | /** |
| michael@0 | 79 | Cancel a deferred_cb if it is currently scheduled in an event_base. |
| michael@0 | 80 | */ |
| michael@0 | 81 | void event_deferred_cb_cancel(struct deferred_cb_queue *, struct deferred_cb *); |
| michael@0 | 82 | /** |
| michael@0 | 83 | Activate a deferred_cb if it is not currently scheduled in an event_base. |
| michael@0 | 84 | */ |
| michael@0 | 85 | void event_deferred_cb_schedule(struct deferred_cb_queue *, struct deferred_cb *); |
| michael@0 | 86 | |
| michael@0 | 87 | #define LOCK_DEFERRED_QUEUE(q) \ |
| michael@0 | 88 | EVLOCK_LOCK((q)->lock, 0) |
| michael@0 | 89 | #define UNLOCK_DEFERRED_QUEUE(q) \ |
| michael@0 | 90 | EVLOCK_UNLOCK((q)->lock, 0) |
| michael@0 | 91 | |
| michael@0 | 92 | #ifdef __cplusplus |
| michael@0 | 93 | } |
| michael@0 | 94 | #endif |
| michael@0 | 95 | |
| michael@0 | 96 | void event_deferred_cb_queue_init(struct deferred_cb_queue *); |
| michael@0 | 97 | struct deferred_cb_queue *event_base_get_deferred_cb_queue(struct event_base *); |
| michael@0 | 98 | |
| michael@0 | 99 | #endif /* _EVENT_INTERNAL_H_ */ |
| michael@0 | 100 |
