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22 * @author Florian Dold
24 * @brief general purpose request queue
27 #include "gnunet_util_lib.h"
29 #define LOG(kind,...) GNUNET_log_from (kind, "mq",__VA_ARGS__)
32 struct GNUNET_MQ_Envelope
35 * Messages are stored in a linked list.
36 * Each queue has its own list of envelopes.
38 struct GNUNET_MQ_Envelope *next;
41 * Messages are stored in a linked list
42 * Each queue has its own list of envelopes.
44 struct GNUNET_MQ_Envelope *prev;
47 * Actual allocated message header.
48 * The GNUNET_MQ_Envelope header is allocated at
49 * the end of the message.
51 struct GNUNET_MessageHeader *mh;
54 * Queue the message is queued in, NULL if message is not queued.
56 struct GNUNET_MQ_Handle *parent_queue;
59 * Called after the message was sent irrevocably.
61 GNUNET_MQ_NotifyCallback sent_cb;
64 * Closure for @e send_cb
69 * Flags that were set for this envelope by
70 * #GNUNET_MQ_env_set_options(). Only valid if
71 * @e have_custom_options is set.
76 * Additional options buffer set for this envelope by
77 * #GNUNET_MQ_env_set_options(). Only valid if
78 * @e have_custom_options is set.
83 * Did the application call #GNUNET_MQ_env_set_options()?
85 int have_custom_options;
90 * Handle to a message queue.
92 struct GNUNET_MQ_Handle
95 * Handlers array, or NULL if the queue should not receive messages
97 struct GNUNET_MQ_MessageHandler *handlers;
100 * Actual implementation of message sending,
101 * called when a message is added
103 GNUNET_MQ_SendImpl send_impl;
106 * Implementation-dependent queue destruction function
108 GNUNET_MQ_DestroyImpl destroy_impl;
111 * Implementation-dependent send cancel function
113 GNUNET_MQ_CancelImpl cancel_impl;
116 * Implementation-specific state
121 * Callback will be called when an error occurs.
123 GNUNET_MQ_ErrorHandler error_handler;
126 * Closure for the error handler.
128 void *error_handler_cls;
131 * Task to asynchronously run #impl_send_continue().
133 struct GNUNET_SCHEDULER_Task *send_task;
136 * Linked list of messages pending to be sent
138 struct GNUNET_MQ_Envelope *envelope_head;
141 * Linked list of messages pending to be sent
143 struct GNUNET_MQ_Envelope *envelope_tail;
146 * Message that is currently scheduled to be
147 * sent. Not the head of the message queue, as the implementation
148 * needs to know if sending has been already scheduled or not.
150 struct GNUNET_MQ_Envelope *current_envelope;
153 * Map of associations, lazily allocated
155 struct GNUNET_CONTAINER_MultiHashMap32 *assoc_map;
158 * Functions to call on queue destruction; kept in a DLL.
160 struct GNUNET_MQ_DestroyNotificationHandle *dnh_head;
163 * Functions to call on queue destruction; kept in a DLL.
165 struct GNUNET_MQ_DestroyNotificationHandle *dnh_tail;
168 * Additional options buffer set for this queue by
169 * #GNUNET_MQ_set_options(). Default is 0.
171 const void *default_extra;
174 * Flags that were set for this queue by
175 * #GNUNET_MQ_set_options(). Default is 0.
177 uint64_t default_flags;
180 * Next id that should be used for the @e assoc_map,
181 * initialized lazily to a random value together with
187 * Number of entries we have in the envelope-DLL.
189 unsigned int queue_length;
192 * #GNUNET_YES if GNUNET_MQ_impl_evacuate was called.
193 * FIXME: is this dead?
198 * #GNUNET_YES if GNUNET_MQ_impl_send_in_flight() was called.
205 * Implementation-specific state for connection to
206 * client (MQ for server).
208 struct ServerClientSocketState
211 * Handle of the client that connected to the server.
213 struct GNUNET_SERVER_Client *client;
216 * Active transmission request to the client.
218 struct GNUNET_SERVER_TransmitHandle *th;
223 * Call the message message handler that was registered
224 * for the type of the given message in the given message queue.
226 * This function is indended to be used for the implementation
229 * @param mq message queue with the handlers
230 * @param mh message to dispatch
233 GNUNET_MQ_inject_message (struct GNUNET_MQ_Handle *mq,
234 const struct GNUNET_MessageHeader *mh)
236 const struct GNUNET_MQ_MessageHandler *handler;
237 int handled = GNUNET_NO;
238 uint16_t ms = ntohs (mh->size);
240 if (NULL == mq->handlers)
242 for (handler = mq->handlers; NULL != handler->cb; handler++)
244 if (handler->type == ntohs (mh->type))
246 handled = GNUNET_YES;
247 if ( (handler->expected_size > ms) ||
248 ( (handler->expected_size != ms) &&
249 (NULL == handler->mv) ) )
251 /* Too small, or not an exact size and
252 no 'mv' handler to check rest */
253 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
254 "Received malformed message of type %u\n",
255 (unsigned int) handler->type);
256 GNUNET_MQ_inject_error (mq,
257 GNUNET_MQ_ERROR_MALFORMED);
260 if ( (NULL == handler->mv) ||
262 handler->mv (handler->cls, mh)) )
264 /* message well-formed, pass to handler */
265 handler->cb (handler->cls, mh);
269 /* Message rejected by check routine */
270 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
271 "Received malformed message of type %u\n",
272 (unsigned int) handler->type);
273 GNUNET_MQ_inject_error (mq,
274 GNUNET_MQ_ERROR_MALFORMED);
280 if (GNUNET_NO == handled)
281 LOG (GNUNET_ERROR_TYPE_INFO,
282 "No handler for message of type %d and size %d\n",
289 * Call the error handler of a message queue with the given
290 * error code. If there is no error handler, log a warning.
292 * This function is intended to be used by the implementation
295 * @param mq message queue
296 * @param error the error type
299 GNUNET_MQ_inject_error (struct GNUNET_MQ_Handle *mq,
300 enum GNUNET_MQ_Error error)
302 if (NULL == mq->error_handler)
304 LOG (GNUNET_ERROR_TYPE_WARNING,
305 "Got error %d, but no handler installed\n",
309 mq->error_handler (mq->error_handler_cls,
315 * Discard the message queue message, free all
316 * allocated resources. Must be called in the event
317 * that a message is created but should not actually be sent.
319 * @param mqm the message to discard
322 GNUNET_MQ_discard (struct GNUNET_MQ_Envelope *ev)
324 GNUNET_assert (NULL == ev->parent_queue);
330 * Obtain the current length of the message queue.
332 * @param mq queue to inspect
333 * @return number of queued, non-transmitted messages
336 GNUNET_MQ_get_length (struct GNUNET_MQ_Handle *mq)
338 return mq->queue_length - (GNUNET_YES == mq->in_flight) ? 1 : 0;
343 * Send a message with the given message queue.
344 * May only be called once per message.
346 * @param mq message queue
347 * @param ev the envelope with the message to send.
350 GNUNET_MQ_send (struct GNUNET_MQ_Handle *mq,
351 struct GNUNET_MQ_Envelope *ev)
353 GNUNET_assert (NULL != mq);
354 GNUNET_assert (NULL == ev->parent_queue);
357 ev->parent_queue = mq;
358 /* is the implementation busy? queue it! */
359 if ( (NULL != mq->current_envelope) ||
360 (NULL != mq->send_task) )
362 GNUNET_CONTAINER_DLL_insert_tail (mq->envelope_head,
367 mq->current_envelope = ev;
375 * Send a copy of a message with the given message queue.
376 * Can be called repeatedly on the same envelope.
378 * @param mq message queue
379 * @param ev the envelope with the message to send.
382 GNUNET_MQ_send_copy (struct GNUNET_MQ_Handle *mq,
383 const struct GNUNET_MQ_Envelope *ev)
385 struct GNUNET_MQ_Envelope *env;
388 msize = ntohs (ev->mh->size);
389 env = GNUNET_malloc (sizeof (struct GNUNET_MQ_Envelope) +
391 env->mh = (struct GNUNET_MessageHeader *) &env[1];
392 env->sent_cb = ev->sent_cb;
393 env->sent_cls = ev->sent_cls;
394 GNUNET_memcpy (&env[1],
403 * Task run to call the send implementation for the next queued
404 * message, if any. Only useful for implementing message queues,
405 * results in undefined behavior if not used carefully.
407 * @param cls message queue to send the next message with
410 impl_send_continue (void *cls)
412 struct GNUNET_MQ_Handle *mq = cls;
414 mq->send_task = NULL;
415 /* call is only valid if we're actually currently sending
417 if (NULL == mq->envelope_head)
419 mq->current_envelope = mq->envelope_head;
420 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
422 mq->current_envelope);
424 mq->current_envelope->mh,
430 * Call the send implementation for the next queued message, if any.
431 * Only useful for implementing message queues, results in undefined
432 * behavior if not used carefully.
434 * @param mq message queue to send the next message with
437 GNUNET_MQ_impl_send_continue (struct GNUNET_MQ_Handle *mq)
439 struct GNUNET_MQ_Envelope *current_envelope;
440 GNUNET_MQ_NotifyCallback cb;
442 GNUNET_assert (0 < mq->queue_length);
444 current_envelope = mq->current_envelope;
445 current_envelope->parent_queue = NULL;
446 mq->current_envelope = NULL;
447 GNUNET_assert (NULL == mq->send_task);
448 mq->send_task = GNUNET_SCHEDULER_add_now (&impl_send_continue,
450 if (NULL != (cb = current_envelope->sent_cb))
452 current_envelope->sent_cb = NULL;
453 cb (current_envelope->sent_cls);
455 GNUNET_free (current_envelope);
460 * Call the send notification for the current message, but do not
461 * try to send the next message until #GNUNET_MQ_impl_send_continue
464 * Only useful for implementing message queues, results in undefined
465 * behavior if not used carefully.
467 * @param mq message queue to send the next message with
470 GNUNET_MQ_impl_send_in_flight (struct GNUNET_MQ_Handle *mq)
472 struct GNUNET_MQ_Envelope *current_envelope;
473 GNUNET_MQ_NotifyCallback cb;
475 mq->in_flight = GNUNET_YES;
476 /* call is only valid if we're actually currently sending
478 current_envelope = mq->current_envelope;
479 GNUNET_assert (NULL != current_envelope);
480 /* can't call cancel from now on anymore */
481 current_envelope->parent_queue = NULL;
482 if (NULL != (cb = current_envelope->sent_cb))
484 current_envelope->sent_cb = NULL;
485 cb (current_envelope->sent_cls);
491 * Create a message queue for the specified handlers.
493 * @param send function the implements sending messages
494 * @param destroy function that implements destroying the queue
495 * @param cancel function that implements canceling a message
496 * @param impl_state for the queue, passed to 'send' and 'destroy'
497 * @param handlers array of message handlers
498 * @param error_handler handler for read and write errors
499 * @param error_handler_cls closure for @a error_handler
500 * @return a new message queue
502 struct GNUNET_MQ_Handle *
503 GNUNET_MQ_queue_for_callbacks (GNUNET_MQ_SendImpl send,
504 GNUNET_MQ_DestroyImpl destroy,
505 GNUNET_MQ_CancelImpl cancel,
507 const struct GNUNET_MQ_MessageHandler *handlers,
508 GNUNET_MQ_ErrorHandler error_handler,
509 void *error_handler_cls)
511 struct GNUNET_MQ_Handle *mq;
514 mq = GNUNET_new (struct GNUNET_MQ_Handle);
515 mq->send_impl = send;
516 mq->destroy_impl = destroy;
517 mq->cancel_impl = cancel;
518 if (NULL != handlers)
520 for (i=0;NULL != handlers[i].cb; i++) ;
521 mq->handlers = GNUNET_new_array (i + 1,
522 struct GNUNET_MQ_MessageHandler);
523 GNUNET_memcpy (mq->handlers,
525 i * sizeof (struct GNUNET_MQ_MessageHandler));
527 mq->error_handler = error_handler;
528 mq->error_handler_cls = error_handler_cls;
529 mq->impl_state = impl_state;
536 * Change the closure argument in all of the `handlers` of the
539 * @param mq to modify
540 * @param handlers_cls new closure to use
543 GNUNET_MQ_set_handlers_closure (struct GNUNET_MQ_Handle *mq,
548 if (NULL == mq->handlers)
550 for (i=0;NULL != mq->handlers[i].cb; i++)
551 mq->handlers[i].cls = handlers_cls;
556 * Get the message that should currently be sent.
557 * Fails if there is no current message.
558 * Only useful for implementing message queues,
559 * results in undefined behavior if not used carefully.
561 * @param mq message queue with the current message
562 * @return message to send, never NULL
564 const struct GNUNET_MessageHeader *
565 GNUNET_MQ_impl_current (struct GNUNET_MQ_Handle *mq)
567 GNUNET_assert (NULL != mq->current_envelope);
568 GNUNET_assert (NULL != mq->current_envelope->mh);
569 return mq->current_envelope->mh;
574 * Get the implementation state associated with the
577 * While the GNUNET_MQ_Impl* callbacks receive the
578 * implementation state, continuations that are scheduled
579 * by the implementation function often only have one closure
580 * argument, with this function it is possible to get at the
581 * implementation state when only passing the GNUNET_MQ_Handle
584 * @param mq message queue with the current message
585 * @return message to send, never NULL
588 GNUNET_MQ_impl_state (struct GNUNET_MQ_Handle *mq)
590 return mq->impl_state;
594 struct GNUNET_MQ_Envelope *
595 GNUNET_MQ_msg_ (struct GNUNET_MessageHeader **mhp,
599 struct GNUNET_MQ_Envelope *ev;
601 ev = GNUNET_malloc (size + sizeof (struct GNUNET_MQ_Envelope));
602 ev->mh = (struct GNUNET_MessageHeader *) &ev[1];
603 ev->mh->size = htons (size);
604 ev->mh->type = htons (type);
612 * Create a new envelope by copying an existing message.
614 * @param hdr header of the message to copy
615 * @return envelope containing @a hdr
617 struct GNUNET_MQ_Envelope *
618 GNUNET_MQ_msg_copy (const struct GNUNET_MessageHeader *hdr)
620 struct GNUNET_MQ_Envelope *mqm;
621 uint16_t size = ntohs (hdr->size);
623 mqm = GNUNET_malloc (sizeof (*mqm) + size);
624 mqm->mh = (struct GNUNET_MessageHeader *) &mqm[1];
625 GNUNET_memcpy (mqm->mh,
633 * Implementation of the #GNUNET_MQ_msg_nested_mh macro.
635 * @param mhp pointer to the message header pointer that will be changed to allocate at
636 * the newly allocated space for the message.
637 * @param base_size size of the data before the nested message
638 * @param type type of the message in the envelope
639 * @param nested_mh the message to append to the message after base_size
641 struct GNUNET_MQ_Envelope *
642 GNUNET_MQ_msg_nested_mh_ (struct GNUNET_MessageHeader **mhp,
645 const struct GNUNET_MessageHeader *nested_mh)
647 struct GNUNET_MQ_Envelope *mqm;
650 if (NULL == nested_mh)
651 return GNUNET_MQ_msg_ (mhp, base_size, type);
653 size = base_size + ntohs (nested_mh->size);
655 /* check for uint16_t overflow */
656 if (size < base_size)
659 mqm = GNUNET_MQ_msg_ (mhp, size, type);
660 GNUNET_memcpy ((char *) mqm->mh + base_size,
662 ntohs (nested_mh->size));
669 * Transmit a queued message to the session's client.
671 * @param cls consensus session
672 * @param size number of bytes available in @a buf
673 * @param buf where the callee should write the message
674 * @return number of bytes written to @a buf
677 transmit_queued (void *cls,
681 struct GNUNET_MQ_Handle *mq = cls;
682 struct ServerClientSocketState *state = GNUNET_MQ_impl_state (mq);
683 const struct GNUNET_MessageHeader *msg = GNUNET_MQ_impl_current (mq);
686 GNUNET_assert (NULL != buf);
687 msg_size = ntohs (msg->size);
688 GNUNET_assert (size >= msg_size);
689 GNUNET_memcpy (buf, msg, msg_size);
692 GNUNET_MQ_impl_send_continue (mq);
699 server_client_destroy_impl (struct GNUNET_MQ_Handle *mq,
702 struct ServerClientSocketState *state = impl_state;
704 if (NULL != state->th)
706 GNUNET_SERVER_notify_transmit_ready_cancel (state->th);
710 GNUNET_assert (NULL != mq);
711 GNUNET_assert (NULL != state);
712 GNUNET_SERVER_client_drop (state->client);
718 server_client_send_impl (struct GNUNET_MQ_Handle *mq,
719 const struct GNUNET_MessageHeader *msg,
722 struct ServerClientSocketState *state = impl_state;
724 GNUNET_assert (NULL != mq);
725 state->th = GNUNET_SERVER_notify_transmit_ready (state->client,
727 GNUNET_TIME_UNIT_FOREVER_REL,
728 &transmit_queued, mq);
732 struct GNUNET_MQ_Handle *
733 GNUNET_MQ_queue_for_server_client (struct GNUNET_SERVER_Client *client)
735 struct GNUNET_MQ_Handle *mq;
736 struct ServerClientSocketState *scss;
738 mq = GNUNET_new (struct GNUNET_MQ_Handle);
739 scss = GNUNET_new (struct ServerClientSocketState);
740 mq->impl_state = scss;
741 scss->client = client;
742 GNUNET_SERVER_client_keep (client);
743 mq->send_impl = &server_client_send_impl;
744 mq->destroy_impl = &server_client_destroy_impl;
750 * Associate the assoc_data in mq with a unique request id.
752 * @param mq message queue, id will be unique for the queue
753 * @param assoc_data to associate
756 GNUNET_MQ_assoc_add (struct GNUNET_MQ_Handle *mq,
761 if (NULL == mq->assoc_map)
763 mq->assoc_map = GNUNET_CONTAINER_multihashmap32_create (8);
767 GNUNET_CONTAINER_multihashmap32_put (mq->assoc_map, id, assoc_data,
768 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
774 GNUNET_MQ_assoc_get (struct GNUNET_MQ_Handle *mq,
777 if (NULL == mq->assoc_map)
779 return GNUNET_CONTAINER_multihashmap32_get (mq->assoc_map, request_id);
784 GNUNET_MQ_assoc_remove (struct GNUNET_MQ_Handle *mq,
789 if (NULL == mq->assoc_map)
791 val = GNUNET_CONTAINER_multihashmap32_get (mq->assoc_map,
793 GNUNET_CONTAINER_multihashmap32_remove_all (mq->assoc_map,
800 * Call a callback once the envelope has been sent, that is,
801 * sending it can not be canceled anymore.
802 * There can be only one notify sent callback per envelope.
804 * @param ev message to call the notify callback for
805 * @param cb the notify callback
806 * @param cb_cls closure for the callback
809 GNUNET_MQ_notify_sent (struct GNUNET_MQ_Envelope *mqm,
810 GNUNET_MQ_NotifyCallback cb,
814 mqm->sent_cls = cb_cls;
819 * Handle we return for callbacks registered to be
820 * notified when #GNUNET_MQ_destroy() is called on a queue.
822 struct GNUNET_MQ_DestroyNotificationHandle
827 struct GNUNET_MQ_DestroyNotificationHandle *prev;
832 struct GNUNET_MQ_DestroyNotificationHandle *next;
835 * Queue to notify about.
837 struct GNUNET_MQ_Handle *mq;
842 GNUNET_SCHEDULER_TaskCallback cb;
852 * Destroy the message queue.
854 * @param mq message queue to destroy
857 GNUNET_MQ_destroy (struct GNUNET_MQ_Handle *mq)
859 struct GNUNET_MQ_DestroyNotificationHandle *dnh;
861 if (NULL != mq->destroy_impl)
863 mq->destroy_impl (mq, mq->impl_state);
865 if (NULL != mq->send_task)
867 GNUNET_SCHEDULER_cancel (mq->send_task);
868 mq->send_task = NULL;
870 while (NULL != mq->envelope_head)
872 struct GNUNET_MQ_Envelope *ev;
874 ev = mq->envelope_head;
875 ev->parent_queue = NULL;
876 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
879 GNUNET_assert (0 < mq->queue_length);
881 GNUNET_MQ_discard (ev);
883 if (NULL != mq->current_envelope)
885 /* we can only discard envelopes that
887 mq->current_envelope->parent_queue = NULL;
888 GNUNET_MQ_discard (mq->current_envelope);
889 mq->current_envelope = NULL;
890 GNUNET_assert (0 < mq->queue_length);
893 GNUNET_assert (0 == mq->queue_length);
894 while (NULL != (dnh = mq->dnh_head))
896 dnh->cb (dnh->cb_cls);
897 GNUNET_MQ_destroy_notify_cancel (dnh);
899 if (NULL != mq->assoc_map)
901 GNUNET_CONTAINER_multihashmap32_destroy (mq->assoc_map);
902 mq->assoc_map = NULL;
904 GNUNET_free_non_null (mq->handlers);
909 const struct GNUNET_MessageHeader *
910 GNUNET_MQ_extract_nested_mh_ (const struct GNUNET_MessageHeader *mh,
914 uint16_t nested_size;
915 const struct GNUNET_MessageHeader *nested_msg;
917 whole_size = ntohs (mh->size);
918 GNUNET_assert (whole_size >= base_size);
919 nested_size = whole_size - base_size;
920 if (0 == nested_size)
922 if (nested_size < sizeof (struct GNUNET_MessageHeader))
927 nested_msg = (const struct GNUNET_MessageHeader *) ((char *) mh + base_size);
928 if (ntohs (nested_msg->size) != nested_size)
938 * Cancel sending the message. Message must have been sent with
939 * #GNUNET_MQ_send before. May not be called after the notify sent
940 * callback has been called
942 * @param ev queued envelope to cancel
945 GNUNET_MQ_send_cancel (struct GNUNET_MQ_Envelope *ev)
947 struct GNUNET_MQ_Handle *mq = ev->parent_queue;
949 GNUNET_assert (NULL != mq);
950 GNUNET_assert (NULL != mq->cancel_impl);
952 mq->evacuate_called = GNUNET_NO;
954 if (mq->current_envelope == ev)
956 // complex case, we already started with transmitting
958 GNUNET_assert (0 < mq->queue_length);
962 // continue sending the next message, if any
963 if (NULL == mq->envelope_head)
965 mq->current_envelope = NULL;
969 mq->current_envelope = mq->envelope_head;
970 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
972 mq->current_envelope);
974 mq->current_envelope->mh,
980 // simple case, message is still waiting in the queue
981 GNUNET_CONTAINER_DLL_remove (mq->envelope_head,
984 GNUNET_assert (0 < mq->queue_length);
988 if (GNUNET_YES != mq->evacuate_called)
990 ev->parent_queue = NULL;
999 * Function to obtain the current envelope
1000 * from within #GNUNET_MQ_SendImpl implementations.
1002 * @param mq message queue to interrogate
1003 * @return the current envelope
1005 struct GNUNET_MQ_Envelope *
1006 GNUNET_MQ_get_current_envelope (struct GNUNET_MQ_Handle *mq)
1008 return mq->current_envelope;
1013 * Function to obtain the last envelope in the queue.
1015 * @param mq message queue to interrogate
1016 * @return the last envelope in the queue
1018 struct GNUNET_MQ_Envelope *
1019 GNUNET_MQ_get_last_envelope (struct GNUNET_MQ_Handle *mq)
1021 if (NULL != mq->envelope_tail)
1022 return mq->envelope_tail;
1024 return mq->current_envelope;
1029 * Set application-specific options for this envelope.
1030 * Overrides the options set for the queue with
1031 * #GNUNET_MQ_set_options() for this message only.
1033 * @param env message to set options for
1034 * @param flags flags to use (meaning is queue-specific)
1035 * @param extra additional buffer for further data (also queue-specific)
1038 GNUNET_MQ_env_set_options (struct GNUNET_MQ_Envelope *env,
1044 env->have_custom_options = GNUNET_YES;
1049 * Get application-specific options for this envelope.
1051 * @param env message to set options for
1052 * @param[out] flags set to flags to use (meaning is queue-specific)
1053 * @return extra additional buffer for further data (also queue-specific)
1056 GNUNET_MQ_env_get_options (struct GNUNET_MQ_Envelope *env,
1059 struct GNUNET_MQ_Handle *mq = env->parent_queue;
1061 if (GNUNET_YES == env->have_custom_options)
1063 *flags = env->flags;
1071 *flags = mq->default_flags;
1072 return mq->default_extra;
1077 * Set application-specific options for this queue.
1079 * @param mq message queue to set options for
1080 * @param flags flags to use (meaning is queue-specific)
1081 * @param extra additional buffer for further data (also queue-specific)
1084 GNUNET_MQ_set_options (struct GNUNET_MQ_Handle *mq,
1088 mq->default_flags = flags;
1089 mq->default_extra = extra;
1094 * Register function to be called whenever @a mq is being
1097 * @param mq message queue to watch
1098 * @param cb function to call on @a mq destruction
1099 * @param cb_cls closure for @a cb
1100 * @return handle for #GNUNET_MQ_destroy_notify_cancel().
1102 struct GNUNET_MQ_DestroyNotificationHandle *
1103 GNUNET_MQ_destroy_notify (struct GNUNET_MQ_Handle *mq,
1104 GNUNET_SCHEDULER_TaskCallback cb,
1107 struct GNUNET_MQ_DestroyNotificationHandle *dnh;
1109 dnh = GNUNET_new (struct GNUNET_MQ_DestroyNotificationHandle);
1112 dnh->cb_cls = cb_cls;
1113 GNUNET_CONTAINER_DLL_insert (mq->dnh_head,
1121 * Cancel registration from #GNUNET_MQ_destroy_notify().
1123 * @param dnh handle for registration to cancel
1126 GNUNET_MQ_destroy_notify_cancel (struct GNUNET_MQ_DestroyNotificationHandle *dnh)
1128 struct GNUNET_MQ_Handle *mq = dnh->mq;
1130 GNUNET_CONTAINER_DLL_remove (mq->dnh_head,