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
|
// Copyright 2013 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Multi-threaded worker
//
// Original source:
// http://git.chromium.org/webm/libwebp.git
// 100644 blob 264210ba2807e4da47eb5d18c04cf869d89b9784 src/utils/thread.c
#include <assert.h>
#include <string.h> // for memset()
#include "./vp9_thread.h"
#include "vpx_mem/vpx_mem.h"
#if CONFIG_MULTITHREAD
struct VP9WorkerImpl {
pthread_mutex_t mutex_;
pthread_cond_t condition_;
pthread_t thread_;
};
//------------------------------------------------------------------------------
static void execute(VP9Worker *const worker); // Forward declaration.
static THREADFN thread_loop(void *ptr) {
VP9Worker *const worker = (VP9Worker*)ptr;
int done = 0;
while (!done) {
pthread_mutex_lock(&worker->impl_->mutex_);
while (worker->status_ == OK) { // wait in idling mode
pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
}
if (worker->status_ == WORK) {
execute(worker);
worker->status_ = OK;
} else if (worker->status_ == NOT_OK) { // finish the worker
done = 1;
}
// signal to the main thread that we're done (for sync())
pthread_cond_signal(&worker->impl_->condition_);
pthread_mutex_unlock(&worker->impl_->mutex_);
}
return THREAD_RETURN(NULL); // Thread is finished
}
// main thread state control
static void change_state(VP9Worker *const worker,
VP9WorkerStatus new_status) {
// No-op when attempting to change state on a thread that didn't come up.
// Checking status_ without acquiring the lock first would result in a data
// race.
if (worker->impl_ == NULL) return;
pthread_mutex_lock(&worker->impl_->mutex_);
if (worker->status_ >= OK) {
// wait for the worker to finish
while (worker->status_ != OK) {
pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
}
// assign new status and release the working thread if needed
if (new_status != OK) {
worker->status_ = new_status;
pthread_cond_signal(&worker->impl_->condition_);
}
}
pthread_mutex_unlock(&worker->impl_->mutex_);
}
#endif // CONFIG_MULTITHREAD
//------------------------------------------------------------------------------
static void init(VP9Worker *const worker) {
memset(worker, 0, sizeof(*worker));
worker->status_ = NOT_OK;
}
static int sync(VP9Worker *const worker) {
#if CONFIG_MULTITHREAD
change_state(worker, OK);
#endif
assert(worker->status_ <= OK);
return !worker->had_error;
}
static int reset(VP9Worker *const worker) {
int ok = 1;
worker->had_error = 0;
if (worker->status_ < OK) {
#if CONFIG_MULTITHREAD
worker->impl_ = (VP9WorkerImpl*)vpx_calloc(1, sizeof(*worker->impl_));
if (worker->impl_ == NULL) {
return 0;
}
if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {
goto Error;
}
if (pthread_cond_init(&worker->impl_->condition_, NULL)) {
pthread_mutex_destroy(&worker->impl_->mutex_);
goto Error;
}
pthread_mutex_lock(&worker->impl_->mutex_);
ok = !pthread_create(&worker->impl_->thread_, NULL, thread_loop, worker);
if (ok) worker->status_ = OK;
pthread_mutex_unlock(&worker->impl_->mutex_);
if (!ok) {
pthread_mutex_destroy(&worker->impl_->mutex_);
pthread_cond_destroy(&worker->impl_->condition_);
Error:
vpx_free(worker->impl_);
worker->impl_ = NULL;
return 0;
}
#else
worker->status_ = OK;
#endif
} else if (worker->status_ > OK) {
ok = sync(worker);
}
assert(!ok || (worker->status_ == OK));
return ok;
}
static void execute(VP9Worker *const worker) {
if (worker->hook != NULL) {
worker->had_error |= !worker->hook(worker->data1, worker->data2);
}
}
static void launch(VP9Worker *const worker) {
#if CONFIG_MULTITHREAD
change_state(worker, WORK);
#else
execute(worker);
#endif
}
static void end(VP9Worker *const worker) {
#if CONFIG_MULTITHREAD
if (worker->impl_ != NULL) {
change_state(worker, NOT_OK);
pthread_join(worker->impl_->thread_, NULL);
pthread_mutex_destroy(&worker->impl_->mutex_);
pthread_cond_destroy(&worker->impl_->condition_);
vpx_free(worker->impl_);
worker->impl_ = NULL;
}
#else
worker->status_ = NOT_OK;
assert(worker->impl_ == NULL);
#endif
assert(worker->status_ == NOT_OK);
}
//------------------------------------------------------------------------------
static VP9WorkerInterface g_worker_interface = {
init, reset, sync, launch, execute, end
};
int vp9_set_worker_interface(const VP9WorkerInterface* const winterface) {
if (winterface == NULL ||
winterface->init == NULL || winterface->reset == NULL ||
winterface->sync == NULL || winterface->launch == NULL ||
winterface->execute == NULL || winterface->end == NULL) {
return 0;
}
g_worker_interface = *winterface;
return 1;
}
const VP9WorkerInterface *vp9_get_worker_interface(void) {
return &g_worker_interface;
}
//------------------------------------------------------------------------------
|
