1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Libavfilter multithreading support
*/
#include "config.h"
#include "libavutil/common.h"
#include "libavutil/cpu.h"
#include "libavutil/mem.h"
#include "avfilter.h"
#include "internal.h"
#include "thread.h"
#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_W32THREADS
#include "compat/w32pthreads.h"
#endif
typedef struct ThreadContext {
AVFilterGraph *graph;
int nb_threads;
pthread_t *workers;
action_func *func;
/* per-execute perameters */
AVFilterContext *ctx;
void *arg;
int *rets;
int nb_rets;
int nb_jobs;
pthread_cond_t last_job_cond;
pthread_cond_t current_job_cond;
pthread_mutex_t current_job_lock;
int current_job;
int done;
} ThreadContext;
static void* attribute_align_arg worker(void *v)
{
ThreadContext *c = v;
int our_job = c->nb_jobs;
int nb_threads = c->nb_threads;
int self_id;
pthread_mutex_lock(&c->current_job_lock);
self_id = c->current_job++;
for (;;) {
while (our_job >= c->nb_jobs) {
if (c->current_job == nb_threads + c->nb_jobs)
pthread_cond_signal(&c->last_job_cond);
pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
our_job = self_id;
if (c->done) {
pthread_mutex_unlock(&c->current_job_lock);
return NULL;
}
}
pthread_mutex_unlock(&c->current_job_lock);
c->rets[our_job % c->nb_rets] = c->func(c->ctx, c->arg, our_job, c->nb_jobs);
pthread_mutex_lock(&c->current_job_lock);
our_job = c->current_job++;
}
}
static void slice_thread_uninit(ThreadContext *c)
{
int i;
pthread_mutex_lock(&c->current_job_lock);
c->done = 1;
pthread_cond_broadcast(&c->current_job_cond);
pthread_mutex_unlock(&c->current_job_lock);
for (i = 0; i < c->nb_threads; i++)
pthread_join(c->workers[i], NULL);
pthread_mutex_destroy(&c->current_job_lock);
pthread_cond_destroy(&c->current_job_cond);
pthread_cond_destroy(&c->last_job_cond);
av_freep(&c->workers);
}
static void slice_thread_park_workers(ThreadContext *c)
{
pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
pthread_mutex_unlock(&c->current_job_lock);
}
static int thread_execute(AVFilterContext *ctx, action_func *func,
void *arg, int *ret, int nb_jobs)
{
ThreadContext *c = ctx->graph->internal->thread;
int dummy_ret;
if (nb_jobs <= 0)
return 0;
pthread_mutex_lock(&c->current_job_lock);
c->current_job = c->nb_threads;
c->nb_jobs = nb_jobs;
c->ctx = ctx;
c->arg = arg;
c->func = func;
if (ret) {
c->rets = ret;
c->nb_rets = nb_jobs;
} else {
c->rets = &dummy_ret;
c->nb_rets = 1;
}
pthread_cond_broadcast(&c->current_job_cond);
slice_thread_park_workers(c);
return 0;
}
static int thread_init(ThreadContext *c, int nb_threads)
{
int i, ret;
if (!nb_threads) {
int nb_cpus = av_cpu_count();
av_log(c->graph, AV_LOG_DEBUG, "Detected %d logical cores.\n", nb_cpus);
// use number of cores + 1 as thread count if there is more than one
if (nb_cpus > 1)
nb_threads = nb_cpus + 1;
else
nb_threads = 1;
}
if (nb_threads <= 1)
return 1;
c->nb_threads = nb_threads;
c->workers = av_mallocz(sizeof(*c->workers) * nb_threads);
if (!c->workers)
return AVERROR(ENOMEM);
c->current_job = 0;
c->nb_jobs = 0;
c->done = 0;
pthread_cond_init(&c->current_job_cond, NULL);
pthread_cond_init(&c->last_job_cond, NULL);
pthread_mutex_init(&c->current_job_lock, NULL);
pthread_mutex_lock(&c->current_job_lock);
for (i = 0; i < nb_threads; i++) {
ret = pthread_create(&c->workers[i], NULL, worker, c);
if (ret) {
pthread_mutex_unlock(&c->current_job_lock);
c->nb_threads = i;
slice_thread_uninit(c);
return AVERROR(ret);
}
}
slice_thread_park_workers(c);
return c->nb_threads;
}
int ff_graph_thread_init(AVFilterGraph *graph)
{
int ret;
#if HAVE_W32THREADS
w32thread_init();
#endif
if (graph->nb_threads == 1) {
graph->thread_type = 0;
return 0;
}
graph->internal->thread = av_mallocz(sizeof(ThreadContext));
if (!graph->internal->thread)
return AVERROR(ENOMEM);
ret = thread_init(graph->internal->thread, graph->nb_threads);
if (ret <= 1) {
av_freep(&graph->internal->thread);
graph->thread_type = 0;
graph->nb_threads = 1;
return (ret < 0) ? ret : 0;
}
graph->nb_threads = ret;
graph->internal->thread_execute = thread_execute;
return 0;
}
void ff_graph_thread_free(AVFilterGraph *graph)
{
if (graph->internal->thread)
slice_thread_uninit(graph->internal->thread);
av_freep(&graph->internal->thread);
}
|
