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ddc9daceca0c85b801165ff624f165ebecc751bc
gimp/app/core/gimp-parallel.cc
Ell ddc9daceca app: add "independent" parameter to gimp_parallel_run_async() 
Add a boolean "independent" parameter to gimp_parallel_run_async().
When FALSE, the passed function is run in the shared async thread
pool; when TRUE, the passed function is run in an independent
thread.

Generally, async operations should run in the async pool, however,
it might be desirable to run long-standing operations, especially
ones that can't be canceled, in independent threads.  This avoids
stalling quicker operations, and shutdown.

Adapt the rest of the code for the change.  In particular,
initialize the font cache in an independent thread.

(cherry picked from commit ad8add6808)
2018-05-27 13:18:56 -04:00

603 lines
16 KiB
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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimp-parallel.c
* Copyright (C) 2018 Ell
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gio/gio.h>
#include <gegl.h>
extern "C"
{
#include "core-types.h"
#include "config/gimpgeglconfig.h"
#include "gimp.h"
#include "gimp-parallel.h"
#include "gimpasync.h"
#define GIMP_PARALLEL_MAX_THREADS 64
#define GIMP_PARALLEL_RUN_ASYNC_MAX_THREADS 1
#define GIMP_PARALLEL_DISTRIBUTE_MAX_THREADS GIMP_PARALLEL_MAX_THREADS
typedef struct
{
GimpAsync *async;
GimpParallelRunAsyncFunc func;
gpointer user_data;
} GimpParallelRunAsyncTask;
typedef struct
{
GThread *thread;
gboolean quit;
} GimpParallelRunAsyncThread;
typedef struct
{
GimpParallelDistributeFunc func;
gint n;
gpointer user_data;
} GimpParallelDistributeTask;
typedef struct
{
GThread *thread;
GMutex mutex;
GCond cond;
gboolean quit;
GimpParallelDistributeTask *volatile task;
volatile gint i;
} GimpParallelDistributeThread;
/* local function prototypes */
static void gimp_parallel_notify_num_processors (GimpGeglConfig *config);
static void gimp_parallel_set_n_threads (gint n_threads);
static void gimp_parallel_run_async_set_n_threads (gint n_threads);
static gpointer gimp_parallel_run_async_thread_func (GimpParallelRunAsyncThread *thread);
static void gimp_parallel_run_async_execute_task (GimpParallelRunAsyncTask *task);
static void gimp_parallel_run_async_cancel (GimpAsync *async);
static void gimp_parallel_distribute_set_n_threads (gint n_threads);
static gpointer gimp_parallel_distribute_thread_func (GimpParallelDistributeThread *thread);
/* local variables */
static gint gimp_parallel_run_async_n_threads = 0;
static GimpParallelRunAsyncThread gimp_parallel_run_async_threads[GIMP_PARALLEL_RUN_ASYNC_MAX_THREADS];
static GMutex gimp_parallel_run_async_mutex;
static GCond gimp_parallel_run_async_cond;
static GQueue gimp_parallel_run_async_queue = G_QUEUE_INIT;
static gint gimp_parallel_distribute_n_threads = 1;
static GimpParallelDistributeThread gimp_parallel_distribute_threads[GIMP_PARALLEL_DISTRIBUTE_MAX_THREADS - 1];
static GMutex gimp_parallel_distribute_completion_mutex;
static GCond gimp_parallel_distribute_completion_cond;
static volatile gint gimp_parallel_distribute_completion_counter;
static volatile gint gimp_parallel_distribute_busy;
/* public functions */
void
gimp_parallel_init (Gimp *gimp)
{
GimpGeglConfig *config;
g_return_if_fail (GIMP_IS_GIMP (gimp));
config = GIMP_GEGL_CONFIG (gimp->config);
g_signal_connect (config, "notify::num-processors",
G_CALLBACK (gimp_parallel_notify_num_processors),
NULL);
gimp_parallel_notify_num_processors (config);
}
void
gimp_parallel_exit (Gimp *gimp)
{
GimpParallelRunAsyncTask *task;
g_return_if_fail (GIMP_IS_GIMP (gimp));
g_signal_handlers_disconnect_by_func (gimp->config,
(gpointer) gimp_parallel_notify_num_processors,
NULL);
/* stop all threads */
gimp_parallel_set_n_threads (0);
/* finish remaining tasks */
while ((task = (GimpParallelRunAsyncTask *)
g_queue_pop_head (&gimp_parallel_run_async_queue)))
{
g_object_set_data (G_OBJECT (task->async),
"gimp-parallel-run-async-link", NULL);
gimp_parallel_run_async_execute_task (task);
}
}
GimpAsync *
gimp_parallel_run_async (gboolean independent,
GimpParallelRunAsyncFunc func,
gpointer user_data)
{
GimpAsync *async;
GimpParallelRunAsyncTask *task;
g_return_val_if_fail (func != NULL, NULL);
async = gimp_async_new ();
task = g_slice_new (GimpParallelRunAsyncTask);
task->async = GIMP_ASYNC (g_object_ref (async));
task->func = func;
task->user_data = user_data;
if (independent)
{
GThread *thread = g_thread_new (
"async-ind",
(GThreadFunc) gimp_parallel_run_async_execute_task,
task);
gimp_async_add_callback (async,
[] (GimpAsync *async,
gpointer thread)
{
g_thread_join ((GThread *) thread);
},
thread);
}
else
{
if (gimp_parallel_run_async_n_threads > 0)
{
GList *link;
link = g_list_alloc ();
link->data = task;
g_object_set_data (G_OBJECT (async),
"gimp-parallel-run-async-link", link);
g_signal_connect_after (async, "cancel",
G_CALLBACK (gimp_parallel_run_async_cancel),
NULL);
g_mutex_lock (&gimp_parallel_run_async_mutex);
g_queue_push_tail_link (&gimp_parallel_run_async_queue, link);
g_cond_signal (&gimp_parallel_run_async_cond);
g_mutex_unlock (&gimp_parallel_run_async_mutex);
}
else
{
gimp_parallel_run_async_execute_task (task);
}
}
return async;
}
void
gimp_parallel_distribute (gint max_n,
GimpParallelDistributeFunc func,
gpointer user_data)
{
GimpParallelDistributeTask task;
gint i;
g_return_if_fail (func != NULL);
if (max_n == 0)
return;
if (max_n < 0)
max_n = gimp_parallel_distribute_n_threads;
else
max_n = MIN (max_n, gimp_parallel_distribute_n_threads);
if (max_n == 1 ||
! g_atomic_int_compare_and_exchange (&gimp_parallel_distribute_busy,
0, 1))
{
func (0, 1, user_data);
return;
}
task.n = max_n;
task.func = func;
task.user_data = user_data;
g_atomic_int_set (&gimp_parallel_distribute_completion_counter, task.n - 1);
for (i = 0; i < task.n - 1; i++)
{
GimpParallelDistributeThread *thread =
&gimp_parallel_distribute_threads[i];
g_mutex_lock (&thread->mutex);
thread->task = &task;
thread->i = i;
g_cond_signal (&thread->cond);
g_mutex_unlock (&thread->mutex);
}
func (i, task.n, user_data);
if (g_atomic_int_get (&gimp_parallel_distribute_completion_counter))
{
g_mutex_lock (&gimp_parallel_distribute_completion_mutex);
while (g_atomic_int_get (&gimp_parallel_distribute_completion_counter))
{
g_cond_wait (&gimp_parallel_distribute_completion_cond,
&gimp_parallel_distribute_completion_mutex);
}
g_mutex_unlock (&gimp_parallel_distribute_completion_mutex);
}
g_atomic_int_set (&gimp_parallel_distribute_busy, 0);
}
void
gimp_parallel_distribute_range (gsize size,
gsize min_sub_size,
GimpParallelDistributeRangeFunc func,
gpointer user_data)
{
gsize n = size;
g_return_if_fail (func != NULL);
if (size == 0)
return;
if (min_sub_size > 1)
n /= min_sub_size;
n = CLAMP (n, 1, gimp_parallel_distribute_n_threads);
gimp_parallel_distribute (n, [=] (gint i, gint n)
{
gsize offset;
gsize sub_size;
offset = (2 * i * size + n) / (2 * n);
sub_size = (2 * (i + 1) * size + n) / (2 * n) - offset;
func (offset, sub_size, user_data);
});
}
void
gimp_parallel_distribute_area (const GeglRectangle *area,
gsize min_sub_area,
GimpParallelDistributeAreaFunc func,
gpointer user_data)
{
gsize n;
g_return_if_fail (area != NULL);
g_return_if_fail (func != NULL);
if (area->width <= 0 || area->height <= 0)
return;
n = (gsize) area->width * (gsize) area->height;
if (min_sub_area > 1)
n /= min_sub_area;
n = CLAMP (n, 1, gimp_parallel_distribute_n_threads);
gimp_parallel_distribute (n, [=] (gint i, gint n)
{
GeglRectangle sub_area;
if (area->width <= area->height)
{
sub_area.x = area->x;
sub_area.width = area->width;
sub_area.y = (2 * i * area->height + n) / (2 * n);
sub_area.height = (2 * (i + 1) * area->height + n) / (2 * n);
sub_area.height -= sub_area.y;
sub_area.y += area->y;
}
else
{
sub_area.y = area->y;
sub_area.height = area->height;
sub_area.x = (2 * i * area->width + n) / (2 * n);
sub_area.width = (2 * (i + 1) * area->width + n) / (2 * n);
sub_area.width -= sub_area.x;
sub_area.x += area->x;
}
func (&sub_area, user_data);
});
}
/* private functions */
static void
gimp_parallel_notify_num_processors (GimpGeglConfig *config)
{
gimp_parallel_set_n_threads (config->num_processors);
}
static void
gimp_parallel_set_n_threads (gint n_threads)
{
gimp_parallel_run_async_set_n_threads (n_threads);
gimp_parallel_distribute_set_n_threads (n_threads);
}
static void
gimp_parallel_run_async_set_n_threads (gint n_threads)
{
gint i;
n_threads = CLAMP (n_threads, 0, GIMP_PARALLEL_RUN_ASYNC_MAX_THREADS);
if (n_threads > gimp_parallel_run_async_n_threads) /* need more threads */
{
for (i = gimp_parallel_run_async_n_threads; i < n_threads; i++)
{
GimpParallelRunAsyncThread *thread =
&gimp_parallel_run_async_threads[i];
thread->quit = FALSE;
thread->thread = g_thread_new (
"async",
(GThreadFunc) gimp_parallel_run_async_thread_func,
thread);
}
}
else if (n_threads < gimp_parallel_run_async_n_threads) /* need less threads */
{
g_mutex_lock (&gimp_parallel_run_async_mutex);
for (i = n_threads; i < gimp_parallel_run_async_n_threads; i++)
{
GimpParallelRunAsyncThread *thread =
&gimp_parallel_run_async_threads[i];
thread->quit = TRUE;
}
g_cond_broadcast (&gimp_parallel_run_async_cond);
g_mutex_unlock (&gimp_parallel_run_async_mutex);
for (i = n_threads; i < gimp_parallel_run_async_n_threads; i++)
{
GimpParallelRunAsyncThread *thread =
&gimp_parallel_run_async_threads[i];
g_thread_join (thread->thread);
}
}
gimp_parallel_run_async_n_threads = n_threads;
}
static gpointer
gimp_parallel_run_async_thread_func (GimpParallelRunAsyncThread *thread)
{
g_mutex_lock (&gimp_parallel_run_async_mutex);
while (TRUE)
{
GimpParallelRunAsyncTask *task;
if (thread->quit)
break;
while ((task = (GimpParallelRunAsyncTask *) g_queue_pop_head (&gimp_parallel_run_async_queue)))
{
g_object_set_data (G_OBJECT (task->async),
"gimp-parallel-run-async-link", NULL);
g_mutex_unlock (&gimp_parallel_run_async_mutex);
gimp_parallel_run_async_execute_task (task);
g_mutex_lock (&gimp_parallel_run_async_mutex);
}
g_cond_wait (&gimp_parallel_run_async_cond,
&gimp_parallel_run_async_mutex);
}
g_mutex_unlock (&gimp_parallel_run_async_mutex);
return NULL;
}
static void
gimp_parallel_run_async_execute_task (GimpParallelRunAsyncTask *task)
{
task->func (task->async, task->user_data);
if (! gimp_async_is_stopped (task->async))
gimp_async_abort (task->async);
g_object_unref (task->async);
g_slice_free (GimpParallelRunAsyncTask, task);
}
static void
gimp_parallel_run_async_cancel (GimpAsync *async)
{
GList *link;
g_mutex_lock (&gimp_parallel_run_async_mutex);
link = (GList *) g_object_get_data (G_OBJECT (async),
"gimp-parallel-run-async-link");
if (link)
{
g_slice_free (GimpParallelRunAsyncTask, link->data);
g_queue_delete_link (&gimp_parallel_run_async_queue, link);
}
g_mutex_unlock (&gimp_parallel_run_async_mutex);
if (link)
{
gimp_async_abort (async);
g_object_unref (async);
}
}
static void
gimp_parallel_distribute_set_n_threads (gint n_threads)
{
gint i;
if (! g_atomic_int_compare_and_exchange (&gimp_parallel_distribute_busy,
0, 1))
{
g_return_if_reached ();
}
n_threads = CLAMP (n_threads, 1, GIMP_PARALLEL_DISTRIBUTE_MAX_THREADS);
if (n_threads > gimp_parallel_distribute_n_threads) /* need more threads */
{
for (i = gimp_parallel_distribute_n_threads - 1; i < n_threads - 1; i++)
{
GimpParallelDistributeThread *thread =
&gimp_parallel_distribute_threads[i];
thread->quit = FALSE;
thread->task = NULL;
thread->thread = g_thread_new (
"worker",
(GThreadFunc) gimp_parallel_distribute_thread_func,
thread);
}
}
else if (n_threads < gimp_parallel_distribute_n_threads) /* need less threads */
{
for (i = n_threads - 1; i < gimp_parallel_distribute_n_threads - 1; i++)
{
GimpParallelDistributeThread *thread =
&gimp_parallel_distribute_threads[i];
g_mutex_lock (&thread->mutex);
thread->quit = TRUE;
g_cond_signal (&thread->cond);
g_mutex_unlock (&thread->mutex);
}
for (i = n_threads - 1; i < gimp_parallel_distribute_n_threads - 1; i++)
{
GimpParallelDistributeThread *thread =
&gimp_parallel_distribute_threads[i];
g_thread_join (thread->thread);
}
}
gimp_parallel_distribute_n_threads = n_threads;
g_atomic_int_set (&gimp_parallel_distribute_busy, 0);
}
static gpointer
gimp_parallel_distribute_thread_func (GimpParallelDistributeThread *thread)
{
g_mutex_lock (&thread->mutex);
while (TRUE)
{
if (thread->quit)
{
break;
}
else if (thread->task)
{
thread->task->func (thread->i, thread->task->n,
thread->task->user_data);
if (g_atomic_int_dec_and_test (
&gimp_parallel_distribute_completion_counter))
{
g_mutex_lock (&gimp_parallel_distribute_completion_mutex);
g_cond_signal (&gimp_parallel_distribute_completion_cond);
g_mutex_unlock (&gimp_parallel_distribute_completion_mutex);
}
thread->task = NULL;
}
g_cond_wait (&thread->cond, &thread->mutex);
}
g_mutex_unlock (&thread->mutex);
return NULL;
}
} /* extern "C" */
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