FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/slicethread.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 112 136 82.4%
Functions: 5 5 100.0%
Branches: 41 68 60.3%
Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdatomic.h>
20 #include "cpu.h"
21 #include "internal.h"
22 #include "slicethread.h"
23 #include "mem.h"
24 #include "thread.h"
25 #include "avassert.h"
26
27 #define MAX_AUTO_THREADS 16
28
29 #if HAVE_PTHREADS || HAVE_W32THREADS || HAVE_OS2THREADS
30
31 typedef struct WorkerContext {
32 AVSliceThread *ctx;
33 pthread_mutex_t mutex;
34 pthread_cond_t cond;
35 pthread_t thread;
36 int done;
37 } WorkerContext;
38
39 struct AVSliceThread {
40 WorkerContext *workers;
41 int nb_threads;
42 int nb_active_threads;
43 int nb_jobs;
44
45 atomic_uint first_job;
46 atomic_uint current_job;
47 pthread_mutex_t done_mutex;
48 pthread_cond_t done_cond;
49 int done;
50 int finished;
51
52 void *priv;
53 void (*worker_func)(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads);
54 void (*main_func)(void *priv);
55 };
56
57 492391 static int run_jobs(AVSliceThread *ctx)
58 {
59 492391 unsigned nb_jobs = ctx->nb_jobs;
60 492391 unsigned nb_active_threads = ctx->nb_active_threads;
61 492391 unsigned first_job = atomic_fetch_add_explicit(&ctx->first_job, 1, memory_order_acq_rel);
62 492391 unsigned current_job = first_job;
63
64 do {
65 492391 ctx->worker_func(ctx->priv, current_job, first_job, nb_jobs, nb_active_threads);
66
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 492391 } while ((current_job = atomic_fetch_add_explicit(&ctx->current_job, 1, memory_order_acq_rel)) < nb_jobs);
67
68 492391 return current_job == nb_jobs + nb_active_threads - 1;
69 }
70
71 42531 static void *attribute_align_arg thread_worker(void *v)
72 {
73 42531 WorkerContext *w = v;
74 42531 AVSliceThread *ctx = w->ctx;
75
76 42531 pthread_mutex_lock(&w->mutex);
77 42531 pthread_cond_signal(&w->cond);
78
79 while (1) {
80 477685 w->done = 1;
81
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 955370 while (w->done)
82 477685 pthread_cond_wait(&w->cond, &w->mutex);
83
84
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 477685 if (ctx->finished) {
85 42531 pthread_mutex_unlock(&w->mutex);
86 42531 return NULL;
87 }
88
89
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 435154 if (run_jobs(ctx)) {
90 52280 pthread_mutex_lock(&ctx->done_mutex);
91 52280 ctx->done = 1;
92 52280 pthread_cond_signal(&ctx->done_cond);
93 52280 pthread_mutex_unlock(&ctx->done_mutex);
94 }
95 }
96 }
97
98 5342 int avpriv_slicethread_create(AVSliceThread **pctx, void *priv,
99 void (*worker_func)(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads),
100 void (*main_func)(void *priv),
101 int nb_threads)
102 {
103 AVSliceThread *ctx;
104 int nb_workers, i;
105 int ret;
106
107
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 5342 av_assert0(nb_threads >= 0);
108
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 5342 if (!nb_threads) {
109 3419 int nb_cpus = av_cpu_count();
110
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 3419 if (nb_cpus > 1)
111 3419 nb_threads = FFMIN(nb_cpus + 1, MAX_AUTO_THREADS);
112 else
113 ✗ nb_threads = 1;
114 }
115
116 5342 nb_workers = nb_threads;
117
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 5342 if (!main_func)
118 5342 nb_workers--;
119
120 5342 *pctx = ctx = av_mallocz(sizeof(*ctx));
121
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 5342 if (!ctx)
122 ✗ return AVERROR(ENOMEM);
123
124
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 5342 if (nb_workers && !(ctx->workers = av_calloc(nb_workers, sizeof(*ctx->workers)))) {
125 ✗ av_freep(pctx);
126 ✗ return AVERROR(ENOMEM);
127 }
128
129 5342 ctx->priv = priv;
130 5342 ctx->worker_func = worker_func;
131 5342 ctx->main_func = main_func;
132 5342 ctx->nb_threads = nb_threads;
133 5342 ctx->nb_active_threads = 0;
134 5342 ctx->nb_jobs = 0;
135 5342 ctx->finished = 0;
136
137 5342 atomic_init(&ctx->first_job, 0);
138 5342 atomic_init(&ctx->current_job, 0);
139 5342 ret = pthread_mutex_init(&ctx->done_mutex, NULL);
140
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 5342 if (ret) {
141 ✗ av_freep(&ctx->workers);
142 ✗ av_freep(pctx);
143 ✗ return AVERROR(ret);
144 }
145 5342 ret = pthread_cond_init(&ctx->done_cond, NULL);
146
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 5342 if (ret) {
147 ✗ ctx->nb_threads = main_func ? 0 : 1;
148 ✗ avpriv_slicethread_free(pctx);
149 ✗ return AVERROR(ret);
150 }
151 5342 ctx->done = 0;
152
153
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 47873 for (i = 0; i < nb_workers; i++) {
154 42531 WorkerContext *w = &ctx->workers[i];
155 int ret;
156 42531 w->ctx = ctx;
157 42531 ret = pthread_mutex_init(&w->mutex, NULL);
158
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 42531 if (ret) {
159 ✗ ctx->nb_threads = main_func ? i : i + 1;
160 ✗ avpriv_slicethread_free(pctx);
161 ✗ return AVERROR(ret);
162 }
163 42531 ret = pthread_cond_init(&w->cond, NULL);
164
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 42531 if (ret) {
165 ✗ pthread_mutex_destroy(&w->mutex);
166 ✗ ctx->nb_threads = main_func ? i : i + 1;
167 ✗ avpriv_slicethread_free(pctx);
168 ✗ return AVERROR(ret);
169 }
170 42531 pthread_mutex_lock(&w->mutex);
171 42531 w->done = 0;
172
173
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 42531 if (ret = pthread_create(&w->thread, NULL, thread_worker, w)) {
174 ✗ ctx->nb_threads = main_func ? i : i + 1;
175 ✗ pthread_mutex_unlock(&w->mutex);
176 ✗ pthread_cond_destroy(&w->cond);
177 ✗ pthread_mutex_destroy(&w->mutex);
178 ✗ avpriv_slicethread_free(pctx);
179 ✗ return AVERROR(ret);
180 }
181
182
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 85062 while (!w->done)
183 42531 pthread_cond_wait(&w->cond, &w->mutex);
184 42531 pthread_mutex_unlock(&w->mutex);
185 }
186
187 5342 return nb_threads;
188 }
189
190 57237 void avpriv_slicethread_execute(AVSliceThread *ctx, int nb_jobs, int execute_main)
191 {
192 57237 int nb_workers, i, is_last = 0;
193
194
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 57237 av_assert0(nb_jobs > 0);
195 57237 ctx->nb_jobs = nb_jobs;
196 57237 ctx->nb_active_threads = FFMIN(nb_jobs, ctx->nb_threads);
197 57237 atomic_store_explicit(&ctx->first_job, 0, memory_order_relaxed);
198 57237 atomic_store_explicit(&ctx->current_job, ctx->nb_active_threads, memory_order_relaxed);
199 57237 nb_workers = ctx->nb_active_threads;
200
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 57237 if (!ctx->main_func || !execute_main)
201 57237 nb_workers--;
202
203
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 492391 for (i = 0; i < nb_workers; i++) {
204 435154 WorkerContext *w = &ctx->workers[i];
205 435154 pthread_mutex_lock(&w->mutex);
206 435154 w->done = 0;
207 435154 pthread_cond_signal(&w->cond);
208 435154 pthread_mutex_unlock(&w->mutex);
209 }
210
211
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 57237 if (ctx->main_func && execute_main)
212 ✗ ctx->main_func(ctx->priv);
213 else
214 57237 is_last = run_jobs(ctx);
215
216
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 57237 if (!is_last) {
217 52280 pthread_mutex_lock(&ctx->done_mutex);
218
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 104560 while (!ctx->done)
219 52280 pthread_cond_wait(&ctx->done_cond, &ctx->done_mutex);
220 52280 ctx->done = 0;
221 52280 pthread_mutex_unlock(&ctx->done_mutex);
222 }
223 57237 }
224
225 37927 void avpriv_slicethread_free(AVSliceThread **pctx)
226 {
227 AVSliceThread *ctx;
228 int nb_workers, i;
229
230
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 37927 if (!pctx || !*pctx)
231 32585 return;
232
233 5342 ctx = *pctx;
234 5342 nb_workers = ctx->nb_threads;
235
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 5342 if (!ctx->main_func)
236 5342 nb_workers--;
237
238 5342 ctx->finished = 1;
239
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 47873 for (i = 0; i < nb_workers; i++) {
240 42531 WorkerContext *w = &ctx->workers[i];
241 42531 pthread_mutex_lock(&w->mutex);
242 42531 w->done = 0;
243 42531 pthread_cond_signal(&w->cond);
244 42531 pthread_mutex_unlock(&w->mutex);
245 }
246
247
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 47873 for (i = 0; i < nb_workers; i++) {
248 42531 WorkerContext *w = &ctx->workers[i];
249 42531 pthread_join(w->thread, NULL);
250 42531 pthread_cond_destroy(&w->cond);
251 42531 pthread_mutex_destroy(&w->mutex);
252 }
253
254 5342 pthread_cond_destroy(&ctx->done_cond);
255 5342 pthread_mutex_destroy(&ctx->done_mutex);
256 5342 av_freep(&ctx->workers);
257 5342 av_freep(pctx);
258 }
259
260 #else /* HAVE_PTHREADS || HAVE_W32THREADS || HAVE_OS32THREADS */
261
262 int avpriv_slicethread_create(AVSliceThread **pctx, void *priv,
263 void (*worker_func)(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads),
264 void (*main_func)(void *priv),
265 int nb_threads)
266 {
267 *pctx = NULL;
268 return AVERROR(ENOSYS);
269 }
270
271 void avpriv_slicethread_execute(AVSliceThread *ctx, int nb_jobs, int execute_main)
272 {
273 av_assert0(0);
274 }
275
276 void avpriv_slicethread_free(AVSliceThread **pctx)
277 {
278 av_assert0(!pctx || !*pctx);
279 }
280
281 #endif /* HAVE_PTHREADS || HAVE_W32THREADS || HAVE_OS32THREADS */
282