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
|
/*
* Copyright (C) 2023 Nuo Mi
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "internal.h"
#include "mem.h"
#include "thread.h"
#include "executor.h"
#if !HAVE_THREADS
#define ExecutorThread char
#define executor_thread_create(t, a, s, ar) 0
#define executor_thread_join(t, r) do {} while(0)
#else
#define ExecutorThread pthread_t
#define executor_thread_create(t, a, s, ar) pthread_create(t, a, s, ar)
#define executor_thread_join(t, r) pthread_join(t, r)
#endif //!HAVE_THREADS
typedef struct ThreadInfo {
AVExecutor *e;
ExecutorThread thread;
} ThreadInfo;
struct AVExecutor {
AVTaskCallbacks cb;
int thread_count;
ThreadInfo *threads;
uint8_t *local_contexts;
AVMutex lock;
AVCond cond;
int die;
AVTask *tasks;
};
static AVTask* remove_task(AVTask **prev, AVTask *t)
{
*prev = t->next;
t->next = NULL;
return t;
}
static void add_task(AVTask **prev, AVTask *t)
{
t->next = *prev;
*prev = t;
}
static int run_one_task(AVExecutor *e, void *lc)
{
AVTaskCallbacks *cb = &e->cb;
AVTask **prev;
for (prev = &e->tasks; *prev && !cb->ready(*prev, cb->user_data); prev = &(*prev)->next)
/* nothing */;
if (*prev) {
AVTask *t = remove_task(prev, *prev);
ff_mutex_unlock(&e->lock);
cb->run(t, lc, cb->user_data);
ff_mutex_lock(&e->lock);
return 1;
}
return 0;
}
#if HAVE_THREADS
static void *executor_worker_task(void *data)
{
ThreadInfo *ti = (ThreadInfo*)data;
AVExecutor *e = ti->e;
void *lc = e->local_contexts + (ti - e->threads) * e->cb.local_context_size;
ff_mutex_lock(&e->lock);
while (1) {
if (e->die) break;
if (!run_one_task(e, lc)) {
//no task in one loop
ff_cond_wait(&e->cond, &e->lock);
}
}
ff_mutex_unlock(&e->lock);
return NULL;
}
#endif
static void executor_free(AVExecutor *e, const int has_lock, const int has_cond)
{
if (e->thread_count) {
//signal die
ff_mutex_lock(&e->lock);
e->die = 1;
ff_cond_broadcast(&e->cond);
ff_mutex_unlock(&e->lock);
for (int i = 0; i < e->thread_count; i++)
executor_thread_join(e->threads[i].thread, NULL);
}
if (has_cond)
ff_cond_destroy(&e->cond);
if (has_lock)
ff_mutex_destroy(&e->lock);
av_free(e->threads);
av_free(e->local_contexts);
av_free(e);
}
AVExecutor* av_executor_alloc(const AVTaskCallbacks *cb, int thread_count)
{
AVExecutor *e;
int has_lock = 0, has_cond = 0;
if (!cb || !cb->user_data || !cb->ready || !cb->run || !cb->priority_higher)
return NULL;
e = av_mallocz(sizeof(*e));
if (!e)
return NULL;
e->cb = *cb;
e->local_contexts = av_calloc(thread_count, e->cb.local_context_size);
if (!e->local_contexts)
goto free_executor;
e->threads = av_calloc(thread_count, sizeof(*e->threads));
if (!e->threads)
goto free_executor;
has_lock = !ff_mutex_init(&e->lock, NULL);
has_cond = !ff_cond_init(&e->cond, NULL);
if (!has_lock || !has_cond)
goto free_executor;
for (/* nothing */; e->thread_count < thread_count; e->thread_count++) {
ThreadInfo *ti = e->threads + e->thread_count;
ti->e = e;
if (executor_thread_create(&ti->thread, NULL, executor_worker_task, ti))
goto free_executor;
}
return e;
free_executor:
executor_free(e, has_lock, has_cond);
return NULL;
}
void av_executor_free(AVExecutor **executor)
{
if (!executor || !*executor)
return;
executor_free(*executor, 1, 1);
*executor = NULL;
}
void av_executor_execute(AVExecutor *e, AVTask *t)
{
AVTaskCallbacks *cb = &e->cb;
AVTask **prev;
ff_mutex_lock(&e->lock);
if (t) {
for (prev = &e->tasks; *prev && cb->priority_higher(*prev, t); prev = &(*prev)->next)
/* nothing */;
add_task(prev, t);
}
ff_cond_signal(&e->cond);
ff_mutex_unlock(&e->lock);
#if !HAVE_THREADS
// We are running in a single-threaded environment, so we must handle all tasks ourselves
while (run_one_task(e, e->local_contexts))
/* nothing */;
#endif
}
|
