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/*
* 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 2
* 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, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/** \file
* \ingroup bli
*
* Task scheduler initialization.
*/
#include "MEM_guardedalloc.h"
#include "BLI_task.h"
#include "BLI_threads.h"
#ifdef WITH_TBB
/* Quiet top level deprecation message, unrelated to API usage here. */
# define TBB_SUPPRESS_DEPRECATED_MESSAGES 1
# include <tbb/tbb.h>
# if TBB_INTERFACE_VERSION_MAJOR >= 10
# define WITH_TBB_GLOBAL_CONTROL
# endif
#endif
/* Task Scheduler */
static int task_scheduler_num_threads = 1;
#ifdef WITH_TBB_GLOBAL_CONTROL
static tbb::global_control *task_scheduler_global_control = nullptr;
#endif
void BLI_task_scheduler_init()
{
#ifdef WITH_TBB_GLOBAL_CONTROL
const int num_threads_override = BLI_system_num_threads_override_get();
if (num_threads_override > 0) {
/* Override number of threads. This settings is used within the lifetime
* of tbb::global_control, so we allocate it on the heap. */
task_scheduler_global_control = OBJECT_GUARDED_NEW(
tbb::global_control, tbb::global_control::max_allowed_parallelism, num_threads_override);
task_scheduler_num_threads = num_threads_override;
}
else {
/* Let TBB choose the number of threads. For (legacy) code that calls
* BLI_task_scheduler_num_threads() we provide the system thread count.
* Ideally such code should be rewritten not to use the number of threads
* at all. */
task_scheduler_num_threads = BLI_system_thread_count();
}
#else
task_scheduler_num_threads = BLI_system_thread_count();
#endif
}
void BLI_task_scheduler_exit()
{
#ifdef WITH_TBB_GLOBAL_CONTROL
OBJECT_GUARDED_DELETE(task_scheduler_global_control, tbb::global_control);
#endif
}
int BLI_task_scheduler_num_threads()
{
return task_scheduler_num_threads;
}
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