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