libs/filters/GP_LinearThreads.c

   1 /*****************************************************************************
   2  * This file is part of gfxprim library.                                     *
   3  *                                                                           *
   4  * Gfxprim 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  * Gfxprim 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 gfxprim; if not, write to the Free Software            *
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor,                        *
  17  * Boston, MA  02110-1301  USA                                               *
  18  *                                                                           *
  19  * Copyright (C) 2009-2012 Cyril Hrubis <metan@ucw.cz>                       *
  20  *                                                                           *
  21  *****************************************************************************/
  22
  23 #include <unistd.h>
  24 #include <pthread.h>
  25 #include <string.h>
  26
  27 #include "core/GP_Common.h"
  28 #include "core/GP_Debug.h"
  29
  30 #include "GP_Linear.h"
  31 #include "GP_LinearThreads.h"
  32
  33 static int nr_threads(GP_Size w, GP_Size h)
  34 {
  35         int count = sysconf(_SC_NPROCESSORS_ONLN);
  36         int threads = GP_MIN(count, (int)(w * h / 1024) + 1);
  37
  38         if (count < -1)
  39                 threads = 1;
  40
  41         GP_DEBUG(1, "Found %u CPUs size %ux%u runnig %u threads",
  42                  count, w, h, threads);
  43
  44         return threads;
  45 }
  46
  47 /*
  48  * Multithreaded callback wrapper.
  49  */
  50 struct callback_priv {
  51         float max;
  52         int abort;
  53         unsigned int nr_threads;
  54         pthread_mutex_t mutex;
  55         GP_ProgressCallback *orig_callback;
  56 };
  57
  58 static int progress_callback_mp(GP_ProgressCallback *self)
  59 {
  60         struct callback_priv *priv = self->priv;
  61
  62         /* If any thread got non-zero return value from a callback, abort all */
  63         if (priv->abort)
  64                 return 1;
  65
  66         if (pthread_mutex_trylock(&priv->mutex)) {
  67                 GP_DEBUG(1, "Mutex locked, skipping calllback.");
  68                 return 0;
  69         }
  70
  71         /* Compute max value for the percentage */
  72         priv->orig_callback->percentage = GP_MAX(self->percentage, priv->max);
  73         priv->max = priv->orig_callback->percentage;
  74
  75         /* Call the original callback */
  76         int ret = priv->orig_callback->callback(priv->orig_callback);
  77
  78         /* Turn on abort flag if callback returned nonzero */
  79         if (ret)
  80                 priv->abort = 1;
  81
  82         pthread_mutex_unlock(&priv->mutex);
  83
  84         return ret;
  85 }
  86
  87 static void callback_priv_init(struct callback_priv *priv, int nr_threads,
  88                                GP_ProgressCallback *orig_callback)
  89 {
  90         priv->nr_threads = nr_threads;
  91         priv->orig_callback = orig_callback;
  92         priv->max = 0;
  93         priv->abort = 0;
  94         pthread_mutex_init(&priv->mutex, NULL);
  95 }
  96
  97 static void callback_priv_exit(struct callback_priv *priv)
  98 {
  99         pthread_mutex_destroy(&priv->mutex);
 100 }
 101
 102 /*
 103  * This code just packs and unpacks convolution parameters.
 104  */
 105 struct convolution {
 106         const GP_Context *src;
 107         GP_Coord x_src;
 108         GP_Coord y_src;
 109         GP_Size w_src;
 110         GP_Size h_src;
 111
 112         GP_Context *dst;
 113         GP_Coord x_dst;
 114         GP_Coord y_dst;
 115
 116         float *kernel;
 117         unsigned int ks;
 118         float kern_div;
 119
 120         GP_ProgressCallback *callback;
 121 };
 122
 123 static void convolution_init(struct convolution *conv, const GP_Context *src,
 124                              GP_Coord x_src, GP_Coord y_src,
 125                              GP_Size w_src, GP_Size h_src,
 126                              GP_Context *dst, GP_Coord x_dst, GP_Coord y_dst,
 127                              float kernel[], unsigned int ks, float kern_div,
 128                              GP_ProgressCallback *callback)
 129 {
 130         conv->src = src;
 131         conv->x_src = x_src;
 132         conv->y_src = y_src;
 133         conv->w_src = w_src;
 134         conv->h_src = h_src;
 135         conv->dst = dst;
 136         conv->x_dst = x_dst;
 137         conv->y_dst = y_dst;
 138         conv->kernel = kernel;
 139         conv->ks = ks;
 140         conv->kern_div = kern_div;
 141         conv->callback = callback;
 142 }
 143
 144 static void *h_linear_convolution(void *arg)
 145 {
 146         struct convolution *conv = arg;
 147
 148         long ret;
 149
 150         ret = GP_FilterHLinearConvolution_Raw(conv->src, conv->x_src, conv->y_src,
 151                                               conv->w_src, conv->h_src, conv->dst,
 152                                               conv->x_dst, conv->y_dst, conv->kernel,
 153                                               conv->ks, conv->kern_div, conv->callback);
 154         return (void*)ret;
 155 }
 156
 157 static void *v_linear_convolution(void *arg)
 158 {
 159         struct convolution *conv = arg;
 160
 161         long ret;
 162
 163         ret = GP_FilterVLinearConvolution_Raw(conv->src, conv->x_src, conv->y_src,
 164                                               conv->w_src, conv->h_src, conv->dst,
 165                                               conv->x_dst, conv->y_dst, conv->kernel,
 166                                               conv->ks, conv->kern_div, conv->callback);
 167         return (void*)ret;
 168 }
 169
 170
 171 int GP_FilterHLinearConvolutionMP_Raw(const GP_Context *src,
 172                                      GP_Coord x_src, GP_Coord y_src,
 173                                      GP_Size w_src, GP_Size h_src,
 174                                      GP_Context *dst,
 175                                      GP_Coord x_dst, GP_Coord y_dst,
 176                                      float kernel[], uint32_t kw, float kern_div,
 177                                      GP_ProgressCallback *callback)
 178 {
 179         int t = nr_threads(w_src, h_src);
 180
 181         if (t == 1) {
 182                 return GP_FilterHLinearConvolution_Raw(src, x_src, y_src,
 183                                                        w_src, h_src,
 184                                                        dst, x_dst, y_dst,
 185                                                        kernel, kw, kern_div,
 186                                                        callback);
 187         }
 188
 189         /* Create multithreaded safe callback on the stack */
 190         struct callback_priv priv;
 191         callback_priv_init(&priv, t, callback);
 192         GP_ProgressCallback callback_mp = {0, progress_callback_mp, &priv};
 193
 194         /* Run t threads */
 195         int i;
 196         pthread_t threads[t];
 197         struct convolution convs[t];
 198         GP_Size h = h_src/t;
 199
 200         for (i = 0; i < t; i++) {
 201                 GP_Coord y_src_2 = y_src + i * h;
 202                 GP_Coord y_dst_2 = y_dst + i * h;
 203                 GP_Size  h_src_2 = h;
 204
 205                 if (i == t - 1)
 206                         h_src_2 = h_src - i * h;
 207
 208                 /* Pack convolution parameters into the structure */
 209                 convolution_init(&convs[i], src, x_src, y_src_2, w_src, h_src_2,
 210                                  dst, x_dst, y_dst_2, kernel, kw, kern_div,
 211                                  callback ? &callback_mp : NULL);
 212
 213                 pthread_create(&threads[i], NULL, h_linear_convolution, &convs[i]);
 214         }
 215
 216         int ret = 0;
 217
 218         for (i = 0; i < t; i++) {
 219                 long r;
 220
 221                 pthread_join(threads[i], (void*)&r);
 222
 223                 ret |= (int)r;
 224         }
 225
 226         callback_priv_exit(&priv);
 227
 228         return ret;
 229 }
 230
 231
 232 int GP_FilterVLinearConvolutionMP_Raw(const GP_Context *src,
 233                                      GP_Coord x_src, GP_Coord y_src,
 234                                      GP_Size w_src, GP_Size h_src,
 235                                      GP_Context *dst,
 236                                      GP_Coord x_dst, GP_Coord y_dst,
 237                                      float kernel[], uint32_t kh, float kern_div,
 238                                      GP_ProgressCallback *callback)
 239 {
 240         int t = nr_threads(w_src, h_src);
 241
 242         if (t == 1) {
 243                 return GP_FilterVLinearConvolution_Raw(src, x_src, y_src,
 244                                                        w_src, h_src,
 245                                                        dst, x_dst, y_dst,
 246                                                        kernel, kh, kern_div,
 247                                                        callback);
 248         }
 249
 250         /* Create multithreaded safe callback on the stack */
 251         struct callback_priv priv;
 252         callback_priv_init(&priv, t, callback);
 253         GP_ProgressCallback callback_mp = {0, progress_callback_mp, &priv};
 254
 255         int i;
 256         pthread_t threads[t];
 257         struct convolution convs[t];
 258         GP_Size h = h_src/t;
 259
 260         for (i = 0; i < t; i++) {
 261                 GP_Coord y_src_2 = y_src + i * h;
 262                 GP_Coord y_dst_2 = y_dst + i * h;
 263                 GP_Size  h_src_2 = h;
 264
 265                 if (i == t - 1)
 266                         h_src_2 = h_src - i * h;
 267
 268                 /* Pack convolution parameters into the structure */
 269                 convolution_init(&convs[i], src, x_src, y_src_2, w_src, h_src_2,
 270                                  dst, x_dst, y_dst_2, kernel, kh, kern_div,
 271                                  callback ? &callback_mp : NULL);
 272
 273                 pthread_create(&threads[i], NULL, v_linear_convolution, &convs[i]);
 274         }
 275
 276         int ret = 0;
 277
 278         for (i = 0; i < t; i++) {
 279                 long r;
 280                 pthread_join(threads[i], (void*)&r);
 281
 282                 ret |= (int)r;
 283         }
 284
 285         callback_priv_exit(&priv);
 286
 287         return ret;
 288 }
 289
 290 /*
 291 int GP_FilterLinearConvolutionMP_Raw(const GP_Context *src,
 292                                     GP_Coord x_src, GP_Coord y_src,
 293                                     GP_Size w_src, GP_Size h_src,
 294                                     GP_Context *dst,
 295                                     GP_Coord x_dst, GP_Coord y_dst,
 296                                     float kernel[], uint32_t kw, uint32_t kh,
 297                                     float kern_div, GP_ProgressCallback *callback)
 298 {
 299 }
 300 */