| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 |
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| 4 | common events code for immediate events
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| 5 |
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| 6 | Copyright (C) Stefan Metzmacher 2009
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| 7 |
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| 8 | ** NOTE! The following LGPL license applies to the tevent
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| 9 | ** library. This does NOT imply that all of Samba is released
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| 10 | ** under the LGPL
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| 11 |
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| 12 | This library is free software; you can redistribute it and/or
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| 13 | modify it under the terms of the GNU Lesser General Public
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| 14 | License as published by the Free Software Foundation; either
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| 15 | version 3 of the License, or (at your option) any later version.
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| 16 |
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| 17 | This library is distributed in the hope that it will be useful,
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| 18 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | Lesser General Public License for more details.
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| 21 |
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| 22 | You should have received a copy of the GNU Lesser General Public
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| 23 | License along with this library; if not, see <http://www.gnu.org/licenses/>.
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| 24 | */
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| 25 |
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| 26 | #include "replace.h"
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| 27 | #include "tevent.h"
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| 28 | #include "tevent_internal.h"
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| 29 | #include "tevent_util.h"
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| 30 |
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| 31 | static void tevent_common_immediate_cancel(struct tevent_immediate *im)
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| 32 | {
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| 33 | if (!im->event_ctx) {
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| 34 | return;
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| 35 | }
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| 36 |
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| 37 | tevent_debug(im->event_ctx, TEVENT_DEBUG_TRACE,
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| 38 | "Cancel immediate event %p \"%s\"\n",
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| 39 | im, im->handler_name);
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| 40 |
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| 41 | /* let the backend free im->additional_data */
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| 42 | if (im->cancel_fn) {
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| 43 | im->cancel_fn(im);
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| 44 | }
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| 45 |
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| 46 | DLIST_REMOVE(im->event_ctx->immediate_events, im);
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| 47 | im->event_ctx = NULL;
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| 48 | im->handler = NULL;
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| 49 | im->private_data = NULL;
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| 50 | im->handler_name = NULL;
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| 51 | im->schedule_location = NULL;
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| 52 | im->cancel_fn = NULL;
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| 53 | im->additional_data = NULL;
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| 54 |
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| 55 | talloc_set_destructor(im, NULL);
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| 56 | }
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| 57 |
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| 58 | /*
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| 59 | destroy an immediate event
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| 60 | */
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| 61 | static int tevent_common_immediate_destructor(struct tevent_immediate *im)
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| 62 | {
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| 63 | tevent_common_immediate_cancel(im);
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| 64 | return 0;
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| 65 | }
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| 66 |
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| 67 | /*
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| 68 | * schedule an immediate event on
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| 69 | */
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| 70 | void tevent_common_schedule_immediate(struct tevent_immediate *im,
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| 71 | struct tevent_context *ev,
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| 72 | tevent_immediate_handler_t handler,
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| 73 | void *private_data,
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| 74 | const char *handler_name,
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| 75 | const char *location)
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| 76 | {
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| 77 | tevent_common_immediate_cancel(im);
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| 78 |
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| 79 | if (!handler) {
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| 80 | return;
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| 81 | }
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| 82 |
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| 83 | im->event_ctx = ev;
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| 84 | im->handler = handler;
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| 85 | im->private_data = private_data;
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| 86 | im->handler_name = handler_name;
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| 87 | im->schedule_location = location;
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| 88 | im->cancel_fn = NULL;
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| 89 | im->additional_data = NULL;
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| 90 |
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| 91 | DLIST_ADD_END(ev->immediate_events, im, struct tevent_immediate *);
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| 92 | talloc_set_destructor(im, tevent_common_immediate_destructor);
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| 93 |
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| 94 | tevent_debug(ev, TEVENT_DEBUG_TRACE,
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| 95 | "Schedule immediate event \"%s\": %p\n",
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| 96 | handler_name, im);
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| 97 | }
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| 98 |
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| 99 | /*
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| 100 | trigger the first immediate event and return true
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| 101 | if no event was triggered return false
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| 102 | */
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| 103 | bool tevent_common_loop_immediate(struct tevent_context *ev)
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| 104 | {
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| 105 | struct tevent_immediate *im = ev->immediate_events;
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| 106 | tevent_immediate_handler_t handler;
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| 107 | void *private_data;
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| 108 |
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| 109 | if (!im) {
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| 110 | return false;
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| 111 | }
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| 112 |
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| 113 | tevent_debug(ev, TEVENT_DEBUG_TRACE,
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| 114 | "Run immediate event \"%s\": %p\n",
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| 115 | im->handler_name, im);
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| 116 |
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| 117 | /*
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| 118 | * remember the handler and then clear the event
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| 119 | * the handler might reschedule the event
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| 120 | */
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| 121 | handler = im->handler;
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| 122 | private_data = im->private_data;
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| 123 |
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| 124 | DLIST_REMOVE(im->event_ctx->immediate_events, im);
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| 125 | im->event_ctx = NULL;
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| 126 | im->handler = NULL;
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| 127 | im->private_data = NULL;
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| 128 | im->handler_name = NULL;
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| 129 | im->schedule_location = NULL;
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| 130 | im->cancel_fn = NULL;
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| 131 | im->additional_data = NULL;
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| 132 |
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| 133 | talloc_set_destructor(im, NULL);
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| 134 |
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| 135 | handler(ev, im, private_data);
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| 136 |
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| 137 | return true;
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| 138 | }
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| 139 |
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