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
230
231
232
233
|
/* taskset.c
Copyright (c) 2003-2019 HandBrake Team
This file is part of the HandBrake source code
Homepage: <http://handbrake.fr/>.
It may be used under the terms of the GNU General Public License v2.
For full terms see the file COPYING file or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
#include "handbrake.h"
#include "ports.h"
#include "taskset.h"
int
taskset_init( taskset_t *ts, int thread_count, size_t arg_size )
{
int init_step;
init_step = 0;
memset( ts, 0, sizeof( *ts ) );
ts->thread_count = thread_count;
ts->arg_size = arg_size;
ts->bitmap_elements = ( ts->thread_count + 31 ) / 32;
ts->task_threads = malloc( sizeof( hb_thread_t* ) * ts->thread_count );
if( ts->task_threads == NULL )
goto fail;
init_step++;
if( arg_size != 0 )
{
ts->task_threads_args = malloc( arg_size * ts->thread_count );
if( ts->task_threads == NULL )
goto fail;
}
init_step++;
ts->task_begin_bitmap = malloc( sizeof( uint32_t ) * ts->bitmap_elements );
if( ts->task_begin_bitmap == NULL )
goto fail;
init_step++;
ts->task_complete_bitmap = malloc( sizeof( uint32_t ) * ts->bitmap_elements );
if( ts->task_complete_bitmap == NULL )
goto fail;
init_step++;
ts->task_stop_bitmap = malloc( sizeof( uint32_t ) * ts->bitmap_elements );
if( ts->task_stop_bitmap == NULL )
goto fail;
init_step++;
ts->task_cond_lock = hb_lock_init();
if( ts->task_cond_lock == NULL)
goto fail;
init_step++;
ts->task_begin = hb_cond_init();
if( ts->task_begin == NULL)
goto fail;
init_step++;
ts->task_complete = hb_cond_init();
if( ts->task_complete == NULL)
goto fail;
init_step++;
/*
* Initialize all arg data to 0.
*/
memset(ts->task_threads_args, 0, ts->arg_size * ts->thread_count );
/*
* Initialize bitmaps to all bits set. This means that any unused bits
* in the bitmap are already in the "condition satisfied" state allowing
* us to test the bitmap 32bits at a time without having to mask off
* the end.
*/
memset(ts->task_begin_bitmap, 0xFF, sizeof( uint32_t ) * ts->bitmap_elements );
memset(ts->task_complete_bitmap, 0xFF, sizeof( uint32_t ) * ts->bitmap_elements );
memset(ts->task_stop_bitmap, 0, sizeof( uint32_t ) * ts->bitmap_elements );
/*
* Important to start off with the threads locked waiting
* on input, no work completed, and not asked to stop.
*/
bit_nclear( ts->task_begin_bitmap, 0, ts->thread_count - 1 );
bit_nclear( ts->task_complete_bitmap, 0, ts->thread_count - 1 );
bit_nclear( ts->task_stop_bitmap, 0, ts->thread_count - 1 );
return (1);
fail:
switch (init_step)
{
default:
hb_cond_close( &ts->task_complete );
/* FALL THROUGH */
case 7:
hb_cond_close( &ts->task_begin );
/* FALL THROUGH */
case 6:
hb_lock_close( &ts->task_cond_lock );
/* FALL THROUGH */
case 5:
free( ts->task_stop_bitmap );
/* FALL THROUGH */
case 4:
free( ts->task_complete_bitmap );
/* FALL THROUGH */
case 3:
free( ts->task_begin_bitmap );
/* FALL THROUGH */
case 2:
free( ts->task_threads_args );
/* FALL THROUGH */
case 1:
free( ts->task_threads );
/* FALL THROUGH */
case 0:
break;
}
return (0);
}
int
taskset_thread_spawn( taskset_t *ts, int thr_idx, const char *descr,
thread_func_t *func, int priority )
{
ts->task_threads[thr_idx] = hb_thread_init( descr, func,
taskset_thread_args( ts, thr_idx ),
priority);
return( ts->task_threads[thr_idx] != NULL );
}
void
taskset_cycle( taskset_t *ts )
{
hb_lock( ts->task_cond_lock );
/*
* Signal all threads that their work is available.
*/
bit_nset( ts->task_begin_bitmap, 0, ts->thread_count - 1 );
hb_cond_broadcast( ts->task_begin );
/*
* Wait until all threads have completed. Note that we must
* loop here as hb_cond_wait() on some platforms (e.g pthead_cond_wait)
* may unblock prematurely.
*/
do
{
hb_cond_wait( ts->task_complete, ts->task_cond_lock );
} while ( !allbits_set( ts->task_complete_bitmap, ts->bitmap_elements ) );
/*
* Clear completion indications for next time.
*/
bit_nclear( ts->task_complete_bitmap, 0, ts->thread_count - 1 );
hb_unlock( ts->task_cond_lock );
}
/*
* Block current thread until work is available for it.
*/
void
taskset_thread_wait4start( taskset_t *ts, int thr_idx )
{
hb_lock( ts->task_cond_lock );
while ( bit_is_clear( ts->task_begin_bitmap, thr_idx ) )
hb_cond_wait( ts->task_begin, ts->task_cond_lock );
/*
* We've been released for one run. Insure we block the next
* time through the loop.
*/
bit_clear( ts->task_begin_bitmap, thr_idx );
hb_unlock( ts->task_cond_lock );
}
/*
* Current thread has completed its work. Indicate completion,
* and if all threads in this task set have completed, wakeup
* anyone waiting for this condition.
*/
void
taskset_thread_complete( taskset_t *ts, int thr_idx )
{
hb_lock( ts->task_cond_lock );
bit_set( ts->task_complete_bitmap, thr_idx );
if( allbits_set( ts->task_complete_bitmap, ts->bitmap_elements ) )
{
hb_cond_signal( ts->task_complete );
}
hb_unlock( ts->task_cond_lock );
}
void
taskset_fini( taskset_t *ts )
{
int i;
hb_lock( ts->task_cond_lock );
/*
* Tell each thread to stop, and then cleanup.
*/
bit_nset( ts->task_stop_bitmap, 0, ts->thread_count - 1 );
bit_nset( ts->task_begin_bitmap, 0, ts->thread_count - 1 );
hb_cond_broadcast( ts->task_begin );
/*
* Wait for all threads to exit.
*/
hb_cond_wait( ts->task_complete, ts->task_cond_lock );
hb_unlock( ts->task_cond_lock );
/*
* Clean up taskset memory.
*/
for( i = 0; i < ts->thread_count; i++)
{
hb_thread_close( &ts->task_threads[i] );
}
hb_lock_close( &ts->task_cond_lock );
hb_cond_close( &ts->task_begin );
hb_cond_close( &ts->task_complete );
free( ts->task_threads );
if( ts->task_threads_args != NULL )
free( ts->task_threads_args );
free( ts->task_begin_bitmap );
free( ts->task_complete_bitmap );
free( ts->task_stop_bitmap );
}
|
