1 /***
2 This file is part of PulseAudio.
3
4 Copyright 2022 Craig Howard
5
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
10
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #ifdef HAVE_CONFIG_H
21 #include <config.h>
22 #endif
23
24 #include "restart-module.h"
25
26 #include <pulse/timeval.h>
27 #include <pulse/xmalloc.h>
28 #include <pulse/mainloop.h>
29
30 #include <pulsecore/core.h>
31 #include <pulsecore/thread-mq.h>
32
33 struct pa_restart_data {
34 init_cb do_init;
35 done_cb do_done;
36
37 pa_usec_t restart_usec;
38 pa_module *module;
39 pa_time_event *time_event;
40 pa_defer_event *defer_event;
41 };
42
43 static void do_reinit(pa_mainloop_api *mainloop, pa_restart_data *rd);
44
call_init(pa_mainloop_api * mainloop,pa_time_event * e,const struct timeval * tv,void * userdata)45 static void call_init(pa_mainloop_api *mainloop, pa_time_event *e, const struct timeval *tv, void *userdata) {
46 pa_restart_data *rd = userdata;
47 int ret;
48
49 if (rd->time_event) {
50 mainloop->time_free(rd->time_event);
51 rd->time_event = NULL;
52 }
53
54 /* now that restart_usec has elapsed, we call do_init to restart the module */
55 ret = rd->do_init(rd->module);
56
57 /* if the init failed, we got here because the caller wanted to restart, so
58 * setup another restart */
59 if (ret < 0)
60 do_reinit(mainloop, rd);
61 }
62
defer_callback(pa_mainloop_api * mainloop,pa_defer_event * e,void * userdata)63 static void defer_callback(pa_mainloop_api *mainloop, pa_defer_event *e, void *userdata) {
64 pa_restart_data *rd = userdata;
65
66 pa_assert(rd->defer_event == e);
67
68 mainloop->defer_enable(rd->defer_event, 0);
69 mainloop->defer_free(rd->defer_event);
70 rd->defer_event = NULL;
71
72 do_reinit(mainloop, rd);
73 }
74
do_reinit(pa_mainloop_api * mainloop,pa_restart_data * rd)75 static void do_reinit(pa_mainloop_api *mainloop, pa_restart_data *rd) {
76 struct timeval tv;
77
78 pa_assert_ctl_context();
79
80 /* call do_done on the module, which will effectively tear it down; all
81 * that remains is the pa_module */
82 rd->do_done(rd->module);
83
84 /* after restart_usec, call do_init to restart the module */
85 pa_gettimeofday(&tv);
86 pa_timeval_add(&tv, rd->restart_usec);
87 rd->time_event = mainloop->time_new(mainloop, &tv, call_init, rd);
88 }
89
pa_restart_module_reinit(pa_module * m,init_cb do_init,done_cb do_done,pa_usec_t restart_usec)90 pa_restart_data *pa_restart_module_reinit(pa_module *m, init_cb do_init, done_cb do_done, pa_usec_t restart_usec) {
91 pa_restart_data *rd;
92
93 pa_assert_ctl_context();
94 pa_assert(do_init);
95 pa_assert(do_done);
96 pa_assert(restart_usec);
97
98 pa_log_info("Starting reinit for %s", m->name);
99
100 rd = pa_xnew0(pa_restart_data, 1);
101 rd->do_init = do_init;
102 rd->do_done = do_done;
103 rd->restart_usec = restart_usec;
104 rd->module = m;
105
106 /* defer actually doing a reinit, so that we can safely exit whatever call
107 * chain we're in before we effectively reinit the module */
108 rd->defer_event = m->core->mainloop->defer_new(m->core->mainloop, defer_callback, rd);
109 m->core->mainloop->defer_enable(rd->defer_event, 1);
110
111 return rd;
112 }
113
pa_restart_free(pa_restart_data * rd)114 void pa_restart_free(pa_restart_data *rd) {
115 pa_assert_ctl_context();
116 pa_assert(rd);
117
118 if (rd->defer_event) {
119 rd->module->core->mainloop->defer_enable(rd->defer_event, 0);
120 rd->module->core->mainloop->defer_free(rd->defer_event);
121 }
122
123 if (rd->time_event) {
124 pa_log_info("Cancel reinit for %s", rd->module->name);
125 rd->module->core->mainloop->time_free(rd->time_event);
126 }
127
128 pa_xfree(rd);
129 }
130