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/*
* OpenSlide, a library for reading whole slide image files
*
* Copyright (c) 2012 Carnegie Mellon University
* All rights reserved.
*
* OpenSlide 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, version 2.1.
*
* OpenSlide 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 OpenSlide. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
/* Read the entirety of slide level 0, using the specified number of threads,
and report the runtime. */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <glib.h>
#include <openslide.h>
#define TILE_SIZE 512
struct state {
openslide_t *osr;
GAsyncQueue *jobs;
GAsyncQueue *completions;
};
struct tile {
int64_t x;
int64_t y;
};
static struct tile sentinel;
static void *thread_func(void *data) {
struct state *state = data;
struct tile *tile;
uint32_t bufsz = TILE_SIZE * TILE_SIZE * sizeof(uint32_t);
uint32_t *buf = g_slice_alloc(bufsz);
g_async_queue_push(state->completions, &sentinel);
while (1) {
tile = g_async_queue_pop(state->jobs);
if (tile == &sentinel) {
break;
}
openslide_read_region(state->osr, buf, tile->x, tile->y, 0, TILE_SIZE,
TILE_SIZE);
g_async_queue_push(state->completions, tile);
}
g_async_queue_push(state->completions, &sentinel);
g_slice_free1(bufsz, buf);
return NULL;
}
int main(int argc, char **argv) {
struct state state;
if (argc != 3) {
printf("Usage: %s <file> <threads>\n", argv[0]);
return 2;
}
int threads = atoi(argv[2]);
if (threads < 1) {
printf("Invalid thread count\n");
return 1;
}
// open file
state.osr = openslide_open(argv[1]);
if (!state.osr) {
printf("Unrecognized file\n");
return 1;
}
const char *error = openslide_get_error(state.osr);
if (error) {
printf("%s\n", error);
openslide_close(state.osr);
return 1;
}
// start threads
state.jobs = g_async_queue_new();
state.completions = g_async_queue_new();
for (int i = 0; i < threads; i++) {
if (g_thread_create(thread_func, &state, FALSE, NULL) == NULL) {
printf("Couldn't start thread\n");
return 1;
}
}
// wait for threads to start
for (int i = 0; i < threads; i++) {
g_async_queue_pop(state.completions);
}
// enqueue jobs
struct tile *tile;
int priming = 5 * threads;
int64_t w, h;
openslide_get_level0_dimensions(state.osr, &w, &h);
GTimer *timer = g_timer_new();
for (int64_t y = 0; y < h; y += TILE_SIZE) {
for (int64_t x = 0; x < w; x += TILE_SIZE) {
if (priming) {
tile = g_slice_new(struct tile);
priming--;
} else {
tile = g_async_queue_pop(state.completions);
}
tile->x = x;
tile->y = y;
g_async_queue_push(state.jobs, tile);
}
}
// tell threads to stop
for (int i = 0; i < threads; i++) {
g_async_queue_push(state.jobs, &sentinel);
}
// wait for threads
while (threads > 0) {
tile = g_async_queue_pop(state.completions);
if (tile == &sentinel) {
threads--;
} else {
g_slice_free(struct tile, tile);
}
}
// print error or time
error = openslide_get_error(state.osr);
if (error) {
printf("%s\n", error);
} else {
double seconds = g_timer_elapsed(timer, NULL);
int tiles = (w + TILE_SIZE - 1) * (h + TILE_SIZE - 1) /
(TILE_SIZE * TILE_SIZE);
printf("%d tiles in %g seconds -> %g tiles/sec\n", tiles, seconds,
tiles / seconds);
}
// clean up
openslide_close(state.osr);
g_async_queue_unref(state.jobs);
g_async_queue_unref(state.completions);
return 0;
}
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