x86/sbrdsp: sign extend start and end gprs in ff_sbr_hf_gen_sse
[ffmpeg.git] / libavfilter / pthread.c
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 /**
20  * @file
21  * Libavfilter multithreading support
22  */
23
24 #include "config.h"
25
26 #include "libavutil/common.h"
27 #include "libavutil/cpu.h"
28 #include "libavutil/mem.h"
29 #include "libavutil/thread.h"
30
31 #include "avfilter.h"
32 #include "internal.h"
33 #include "thread.h"
34
35 typedef struct ThreadContext {
36     AVFilterGraph *graph;
37
38     int nb_threads;
39     pthread_t *workers;
40     avfilter_action_func *func;
41
42     /* per-execute parameters */
43     AVFilterContext *ctx;
44     void *arg;
45     int   *rets;
46     int nb_jobs;
47
48     pthread_cond_t last_job_cond;
49     pthread_cond_t current_job_cond;
50     pthread_mutex_t current_job_lock;
51     int current_job;
52     unsigned int current_execute;
53     int done;
54 } ThreadContext;
55
56 static void* attribute_align_arg worker(void *v)
57 {
58     ThreadContext *c = v;
59     int our_job      = c->nb_jobs;
60     int nb_threads   = c->nb_threads;
61     unsigned int last_execute = 0;
62     int ret, self_id;
63
64     pthread_mutex_lock(&c->current_job_lock);
65     self_id = c->current_job++;
66
67     for (;;) {
68         while (our_job >= c->nb_jobs) {
69             if (c->current_job == nb_threads + c->nb_jobs)
70                 pthread_cond_signal(&c->last_job_cond);
71
72             while (last_execute == c->current_execute && !c->done)
73                 pthread_cond_wait(&c->current_job_cond, &c->current_job_lock);
74             last_execute = c->current_execute;
75             our_job = self_id;
76
77             if (c->done) {
78                 pthread_mutex_unlock(&c->current_job_lock);
79                 return NULL;
80             }
81         }
82         pthread_mutex_unlock(&c->current_job_lock);
83
84         ret = c->func(c->ctx, c->arg, our_job, c->nb_jobs);
85         if (c->rets)
86             c->rets[our_job % c->nb_jobs] = ret;
87
88         pthread_mutex_lock(&c->current_job_lock);
89         our_job = c->current_job++;
90     }
91 }
92
93 static void slice_thread_uninit(ThreadContext *c)
94 {
95     int i;
96
97     pthread_mutex_lock(&c->current_job_lock);
98     c->done = 1;
99     pthread_cond_broadcast(&c->current_job_cond);
100     pthread_mutex_unlock(&c->current_job_lock);
101
102     for (i = 0; i < c->nb_threads; i++)
103          pthread_join(c->workers[i], NULL);
104
105     pthread_mutex_destroy(&c->current_job_lock);
106     pthread_cond_destroy(&c->current_job_cond);
107     pthread_cond_destroy(&c->last_job_cond);
108     av_freep(&c->workers);
109 }
110
111 static void slice_thread_park_workers(ThreadContext *c)
112 {
113     while (c->current_job != c->nb_threads + c->nb_jobs)
114         pthread_cond_wait(&c->last_job_cond, &c->current_job_lock);
115     pthread_mutex_unlock(&c->current_job_lock);
116 }
117
118 static int thread_execute(AVFilterContext *ctx, avfilter_action_func *func,
119                           void *arg, int *ret, int nb_jobs)
120 {
121     ThreadContext *c = ctx->graph->internal->thread;
122
123     if (nb_jobs <= 0)
124         return 0;
125
126     pthread_mutex_lock(&c->current_job_lock);
127
128     c->current_job = c->nb_threads;
129     c->nb_jobs     = nb_jobs;
130     c->ctx         = ctx;
131     c->arg         = arg;
132     c->func        = func;
133     c->rets        = ret;
134     c->current_execute++;
135
136     pthread_cond_broadcast(&c->current_job_cond);
137
138     slice_thread_park_workers(c);
139
140     return 0;
141 }
142
143 static int thread_init_internal(ThreadContext *c, int nb_threads)
144 {
145     int i, ret;
146
147     if (!nb_threads) {
148         int nb_cpus = av_cpu_count();
149         // use number of cores + 1 as thread count if there is more than one
150         if (nb_cpus > 1)
151             nb_threads = nb_cpus + 1;
152         else
153             nb_threads = 1;
154     }
155
156     if (nb_threads <= 1)
157         return 1;
158
159     c->nb_threads = nb_threads;
160     c->workers = av_mallocz_array(sizeof(*c->workers), nb_threads);
161     if (!c->workers)
162         return AVERROR(ENOMEM);
163
164     c->current_job = 0;
165     c->nb_jobs     = 0;
166     c->done        = 0;
167
168     pthread_cond_init(&c->current_job_cond, NULL);
169     pthread_cond_init(&c->last_job_cond,    NULL);
170
171     pthread_mutex_init(&c->current_job_lock, NULL);
172     pthread_mutex_lock(&c->current_job_lock);
173     for (i = 0; i < nb_threads; i++) {
174         ret = pthread_create(&c->workers[i], NULL, worker, c);
175         if (ret) {
176            pthread_mutex_unlock(&c->current_job_lock);
177            c->nb_threads = i;
178            slice_thread_uninit(c);
179            return AVERROR(ret);
180         }
181     }
182
183     slice_thread_park_workers(c);
184
185     return c->nb_threads;
186 }
187
188 int ff_graph_thread_init(AVFilterGraph *graph)
189 {
190     int ret;
191
192 #if HAVE_W32THREADS
193     w32thread_init();
194 #endif
195
196     if (graph->nb_threads == 1) {
197         graph->thread_type = 0;
198         return 0;
199     }
200
201     graph->internal->thread = av_mallocz(sizeof(ThreadContext));
202     if (!graph->internal->thread)
203         return AVERROR(ENOMEM);
204
205     ret = thread_init_internal(graph->internal->thread, graph->nb_threads);
206     if (ret <= 1) {
207         av_freep(&graph->internal->thread);
208         graph->thread_type = 0;
209         graph->nb_threads  = 1;
210         return (ret < 0) ? ret : 0;
211     }
212     graph->nb_threads = ret;
213
214     graph->internal->thread_execute = thread_execute;
215
216     return 0;
217 }
218
219 void ff_graph_thread_free(AVFilterGraph *graph)
220 {
221     if (graph->internal->thread)
222         slice_thread_uninit(graph->internal->thread);
223     av_freep(&graph->internal->thread);
224 }