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%pythonbegin %{
#
# Copyright (c) 2016-2025 Intel Corporation
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
__all__ = ["task_arena",
"task_group",
"global_control",
"default_num_threads",
"this_task_arena_max_concurrency",
"this_task_arena_current_thread_index",
"runtime_version",
"runtime_interface_version"]
%}
%begin %{
/* Defines Python wrappers for Intel(R) oneAPI Threading Building Blocks (oneTBB) */
%}
%module api
#if SWIG_VERSION < 0x030001
#error SWIG version 3.0.6 or newer is required for correct functioning
#endif
%{
#include "tbb/task_arena.h"
#include "tbb/task_group.h"
#include "tbb/global_control.h"
#include "tbb/version.h"
#include <condition_variable>
#include <mutex>
#include <memory>
using namespace tbb;
class PyCaller : public swig::SwigPtr_PyObject {
public:
// icpc 2013 does not support simple using SwigPtr_PyObject::SwigPtr_PyObject;
PyCaller(const PyCaller& s) : SwigPtr_PyObject(s) {}
PyCaller(PyObject *p, bool initial = true) : SwigPtr_PyObject(p, initial) {}
void operator()() const {
SWIG_PYTHON_THREAD_BEGIN_BLOCK;
PyObject* r = PyObject_CallFunctionObjArgs((PyObject*)*this, nullptr);
if(r) Py_DECREF(r);
SWIG_PYTHON_THREAD_END_BLOCK;
}
};
struct ArenaPyCaller {
task_arena *my_arena;
PyObject *my_callable;
ArenaPyCaller(task_arena *a, PyObject *c) : my_arena(a), my_callable(c) {
SWIG_PYTHON_THREAD_BEGIN_BLOCK;
Py_XINCREF(c);
SWIG_PYTHON_THREAD_END_BLOCK;
}
void operator()() const {
my_arena->execute(PyCaller(my_callable, false));
}
};
struct barrier_data {
std::condition_variable event;
std::mutex m;
int worker_threads, full_threads;
};
void _concurrency_barrier(int threads = tbb::task_arena::automatic) {
if(threads == tbb::task_arena::automatic)
threads = tbb::this_task_arena::max_concurrency();
if(threads < 2)
return;
std::unique_ptr<global_control> g(
(global_control::active_value(global_control::max_allowed_parallelism) < unsigned(threads))?
new global_control(global_control::max_allowed_parallelism, threads) : nullptr);
tbb::task_group tg;
barrier_data b;
b.worker_threads = 0;
b.full_threads = threads-1;
for(int i = 0; i < b.full_threads; i++)
tg.run([&b]{
std::unique_lock<std::mutex> lock(b.m);
if(++b.worker_threads >= b.full_threads)
b.event.notify_all();
else while(b.worker_threads < b.full_threads)
b.event.wait(lock);
});
std::unique_lock<std::mutex> lock(b.m);
b.event.wait(lock);
tg.wait();
};
%}
void _concurrency_barrier(int threads = tbb::task_arena::automatic);
namespace tbb {
class task_arena {
public:
static const int automatic = -1;
task_arena(int max_concurrency = automatic, unsigned reserved_for_masters = 1);
task_arena(const task_arena &s);
~task_arena();
void initialize();
void initialize(int max_concurrency, unsigned reserved_for_masters = 1);
void terminate();
bool is_active();
%extend {
void enqueue( PyObject *c ) { $self->enqueue(PyCaller(c)); }
void execute( PyObject *c ) { $self->execute(PyCaller(c)); }
};
};
class task_group {
public:
task_group();
~task_group();
void wait();
void cancel();
%extend {
void run( PyObject *c ) { $self->run(PyCaller(c)); }
void run( PyObject *c, task_arena *a ) { $self->run(ArenaPyCaller(a, c)); }
};
};
class global_control {
public:
enum parameter {
max_allowed_parallelism,
thread_stack_size,
parameter_max // insert new parameters above this point
};
global_control(parameter param, size_t value);
~global_control();
static size_t active_value(parameter param);
};
} // tbb
%inline {
inline const char* runtime_version() { return TBB_runtime_version();}
inline int runtime_interface_version() { return TBB_runtime_interface_version();}
inline int this_task_arena_max_concurrency() { return this_task_arena::max_concurrency();}
inline int this_task_arena_current_thread_index() { return this_task_arena::current_thread_index();}
};
// Additional definitions for Python part of the module
%pythoncode %{
default_num_threads = this_task_arena_max_concurrency
%}
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